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Also known as the DIC.

This is the display readout panel on the dash. It's above the radio for 1984-1989; above the climate controls, 1990-1996.
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istter1 Recent fule pump change
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Bakersfield Ca
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Just replaced fuel pump last week. There is about a 10 second delay when you start the motor now before it fires.
Repalace Dist, rotor and plug wires will do plugs tomorrow. Tons of carbon inside and outside cap and on rotor. When what I suspect is the fule supply hits in it runs great. Before I put the pump in, it was haveing a fuel supply problem as I drove. Not at start up It would fire right up.

Is there something I may have done wrong doing the fuel pump install?
Posted on: 2012/5/30 5:02
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bogus Re: Recent fule pump change
Grand Imperial Pooh-Bah
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Unlikely.

But you could have a bad relay.

I thought I had a diagram, but I can't find it.

However, there is a backup circuit for the fuel pump. It is the oil pressure switch. IIRC, 1987 has 2 thingys screwed into the back of the engine block behind the distributor. One is the oil pressure sensor, the other the oil pressure switch.

If it sees 4 PSI, it will fire the fuel pump. This is a back up in case the fuel pump relay fails.

If it is taking a long time to start, I would start suspecting the relay.
Posted on: 2012/5/30 5:07
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istter1 Re: Recent fule pump change
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Well have a spare relay so I will put it in tomorrow. I was suspecting that or with all the crud I have been sturing up could have restricted the flow in the new filter/ not likely.

Now when I first start the motor I don't hear the pump running.When you crank the engine and let off the pump runs about 2 sec after you let up.
Posted on: 2012/5/30 5:26
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Matatk Re: Recent fule pump change
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If you don't hear the pump turn on with the key only (no cranking) it is likely the relay is bad.

Matthew
Posted on: 2012/5/30 11:38
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istter1 Re: Recent fule pump change
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I hope it is that simple . I will replace the relay when I get off work tonight.
Posted on: 2012/5/30 11:54
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flyboy Re: Recent fule pump change
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The pump was replaced and now the relay failed? Sounds kind of coincidental. The relay is under the passenger side dash on my '91, I think.
Posted on: 2012/5/30 12:31
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istter1 Re: Recent fule pump change
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Kindy of funky huh. After replacing the pump a different problem occurs . I suspect gremlins. My relay is on the drivers side fire wall. Behind the fule relay is the overdrive relay replaced the over drive relay 2 years ago. 5-10 minutes job.

After replacing it will know right away.
Posted on: 2012/5/30 13:02
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istter1 Re: Recent fule pump change
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No go the relay was nasty looking. I cleaned up the terminals and put in a new relay. Acted the same. Will mess with things tomorrow and check a few other things. Don't know what but I will retrace what I have fixed.

Attach file:


odt fpr.odt Size: 205.69 KB; Hits: 183
Posted on: 2012/5/31 4:33
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Matatk Re: Recent fule pump change
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Check for power at the pump to see if it's getting 12v. Also check your pressure at the rail.
Posted on: 2012/5/31 11:33
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istter1 Re: Recent fule pump change
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Thanks
Posted on: 2012/5/31 12:22
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istter1 Re: Recent fule pump change
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Quote:

Matatk wrote:
Check for power at the pump to see if it's getting 12v. Also check your pressure at the rail.


Have very little experiance on gas injectors. Lots on Diesel.And heavy equipment.

Picked up a tester. Hooked it up turned key on it barley bumped. Motor started and it read between 38-40 steady. let it run stayed the same . Pumped some fule through it and it puslated. Ran some more to check the flow from the pump and it started pumping correctly. Turned the motor off and gage went to botton. Waited 30 sec. turned key on gage jumped up to 40 and then dropped. Crancked motor over and until it fired up presure was a little above 10 Could have been higher. Motor started pressure 38-40 again. Turned motor so pump would hit. 40 and then dropped to 0.

What did I do right and what did I do wrong??

Could this be fule injector leaking. Have had backfire a few times.

Posted on: 2012/6/1 2:30
Edited by istter1 on 2012/6/1 2:55:19
Edited by istter1 on 2012/6/1 3:29:14
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jonszr1 Re: Recent fule pump change
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Lone Pine, CA
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you defiantly have something leaking . when you just turn on the ignition, with the fuel pressure gauge attached it should go to i believe 38-40 and the pressure should hold for a while . on my zr1 the pressure holds for 15 minutes before bleeding very slowly down . i would ck injectors fuel, pressure regulator. not sure on the standard 350 systems what else it could be .hope this helps some
Posted on: 2012/6/1 5:37
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istter1 Re: Recent fule pump change
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Quote:

jonszr1 wrote:
you defiantly have something leaking . when you just turn on the ignition, with the fuel pressure gauge attached it should go to i believe 38-40 and the pressure should hold for a while . on my zr1 the pressure holds for 15 minutes before bleeding very slowly down . i would ck injectors fuel, pressure regulator. not sure on the standard 350 systems what else it could be .hope this helps some


Thanks Brad
From the records the prior owner keep the two items you mentioned have not been replaced in the life of this car.
Posted on: 2012/6/1 12:06
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Matatk Re: Recent fule pump change
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I recall you changed the filter already.

I would double check the installation of the pump since that's the most recent thing you did.

I had a problem where the harness inside disconnected accidentally after reinstalling. I zip tied it closed so it wouldn't happen again. Make sure the wiring is good. Also, make sure the fuel line you used to replace the dampener is on secure.

As another test, you can hook up some additional fuel line to the output side of the fuel pump and pump it in to a bucket to see if it's flowing ok.

Matthew
Posted on: 2012/6/1 12:47
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Matatk Re: Recent fule pump change
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Also, 38-40 running is correct fuel pressure. It will fluctuate slightly when you hit the gas, also normal. It should not drop immediately with key off. When I turn the key on without cranking I get 43.5 psi so 10 is definitely not correct. You either have a pump problem, delivery problem, or leak somewhere.
Posted on: 2012/6/1 12:49
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istter1 Re: Recent fule pump change
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Quote:

Matatk wrote:
Also, 38-40 running is correct fuel pressure. It will fluctuate slightly when you hit the gas, also normal. It should not drop immediately with key off. When I turn the key on without cranking I get 43.5 psi so 10 is definitely not correct. You either have a pump problem, delivery problem, or leak somewhere.


The problems started after the fule lines were ripped off and I replaced the fule return line filter. am going out to check the flexable lines I installed and the filters as that is an easy job with the heat going close to 100 today.

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jpg  fixed.jpg (181.70 KB)
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jpg  Filter.jpg (136.54 KB)
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Posted on: 2012/6/1 16:56
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Matatk Re: Recent fule pump change
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There can be problems with running fuel lines too close to hot exhaust and vaporizing the gas in the lines. Be careful about that.
Posted on: 2012/6/1 17:41
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istter1 Re: Recent fule pump change
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Quote:

Matatk wrote:
There can be problems with running fuel lines too close to hot exhaust and vaporizing the gas in the lines. Be careful about that.


Lines are now farther away from heat then the orginal way. the lower part is heat shielded near the cats.
Posted on: 2012/6/1 18:01
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istter1 Re: Recent fule pump change
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Pump works great. 12v at pump. Lines at at pump good and tight.

100 + will try later. hot hot
Posted on: 2012/6/1 21:46
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istter1 Re: Recent fule pump change
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Can't find any leaks. When I changed the fuel pump should the return fuel line been under pressure by the gas cap?

I guess I will get a spray bottle and with the engine running spray soapy water on the lines to see if I can find a leak.

Posted on: 2012/6/2 4:46
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Matatk Re: Recent fule pump change
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Not uncommon for the gas tank to vent when you open it.

I am wondering if the return fuel line was affected when you replaced that dampener. I would try to remove it and see what happens.
Posted on: 2012/6/2 11:44
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BillH Re: Recent fule pump change
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The intank fuel check valve isn't working.
Posted on: 2012/6/2 12:45
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istter1 Re: Recent fule pump change
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Quote:

BillH wrote:
The intank fuel check valve isn't working.


I am going to give this a try. Does this sound correct.

Pull the rubber boot around the gas filler and get access to the fuel and return lines where they are rubber right at the top of the tank.

Pressure up and then clamp off the fuel line. If pressure stays up then the problem is the check valve.

Then pressure up and clamp off the return line. If pressure stays up then the regulator is the problem.

If I clamp them both and the pressure drops then I have to go looking for injector leaks.

I will clamp off lines one at a time. I did not think fuel pressure is held up by the tank. Should just be between the pump/check valve and the regulator. I know the tank pressurizes, but not up to 30-40 lbs.

Posted on: 2012/6/2 13:14
Edited by istter1 on 2012/6/2 13:51:18
Edited by istter1 on 2012/6/2 13:53:26
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Matatk Re: Recent fule pump change
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If you search for some of my old posts I have the fuel pressure leak down FSM pages in them.
Posted on: 2012/6/2 14:27
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istter1 Re: Recent fule pump change
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Quote:

Matatk wrote:
If you search for some of my old posts I have the fuel pressure leak down FSM pages in them.


Cool just got back from breakfast and getting ready to start. Will look for fuel pressure leak down FSM before I start.

Thanks
Posted on: 2012/6/2 14:49
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istter1 Re: Recent fule pump change
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Found it. Will read before I start.

fuel pressure leak down FSM pages

http://www.corvetteguruforum.com/modu ... id=163963#forumpost163963
Posted on: 2012/6/2 14:54
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istter1 Re: Recent fule pump change
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When I replaced my fuel pump it came with a short piece of 3/8" hose you can use in place of the check valve and clamp its ends. The apparent drawback is that you lose the benefit of having a dampener and could get fuel line pulsations which can cause a "hammering" sound.
How many dampners do I need there is one on the 87 vett they put on the return line a filter to take care of this.

In the picture is the check valve and if I use the line to by pass it do I have to cap it off? my guess,


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jpg  check valve.jpg (145.95 KB)
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Posted on: 2012/6/2 15:25
Edited by istter1 on 2012/6/2 15:41:06
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istter1 Re: Recent fule pump change
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Bad Luck when I clamped off the fuel return line the car started on fire under the intake.
It appears fule came out of this line going to the presure reg or which ever one that is lol
.

Looks like minor damage so far. Son coming over he is the expert on starting jeep comanchee on fire.

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jpg  fire line.jpg (232.27 KB)
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Posted on: 2012/6/2 16:14
Edited by istter1 on 2012/6/2 16:53:01
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istter1 Re: Recent fule pump change
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There is a vacume line that goes in where this plug connects to fire wall. where does it go to. minor damage to plug. Dumb me the other place I thought the fule was comeing from was the brake booster. Lol

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jpg  vacline.jpg (341.95 KB)
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jpg  fire line.jpg (232.27 KB)
5144_4fca5396263e5.jpg 2048X1536 px
Posted on: 2012/6/2 17:57
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Matatk Re: Recent fule pump change
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Steve - I replaced the fuel dampener with the fuel hose when I did mine since I already had it out. I'd heard of many units going bad over time and there really is no negative drawback.

Sorry to hear about the fire mishap. Was the car running while you were doing the test? It should be key on/off but not running.

I am having a hard time understanding which line into the firewall you are referring to. Can you circle it or try another angle?

Matthew
Posted on: 2012/6/2 18:21
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istter1 Re: Recent fule pump change
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Should fule be coming out of the fuel reg vac line.

here is a better pic

started breakfest on fire also

Attach file:



jpg  vacpl.jpg (356.59 KB)
5144_4fca64d4c70fb.jpg 2048X1536 px
Posted on: 2012/6/2 19:09
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istter1 Re: Recent fule pump change
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Well we tore it appart replaced vacume lines checked electrial lines. Put it together and one of the o rings failed on the fule line. Tore it apart again checked to make sure for no leaks. Put fule presure tester on held at 42. put it together and it fired right up. took it for a short test drive oil lite with 60lb of pressure blinks shows oil temp at 300. The fire was on the passanger side where the oil pressure and temp line is I think. Hood is stuck and can't open it . Have tool from cc long rod but can't get it to work.
As you can see diafram had a rip in it.
It still fires up but not taking any chances until we open hood.

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jpg  dia.jpg (275.54 KB)
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Posted on: 2012/6/3 0:55
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bogus Re: Recent fule pump change
Grand Imperial Pooh-Bah
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that's some scary shit, dude!!

Glad it didn't spread far!!!
Posted on: 2012/6/3 1:54
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istter1 Re: Recent fule pump change
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Sort of weird while I was clicking the switch back and forth building up pressure in the lines it looks like gas passed through the rip in the diaphram and sprayed all over no idea what made it spark. We as we tore it apart did the key to see where it was leaking from. It sprayed all over.

once I figure out how to get hood open pulling on cables did not work cable was damaged in fire..
I will check to see why it lost power and the oil temp shot up.
Posted on: 2012/6/3 2:06
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milsurpman Re: Recent fule pump change
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Just crazy! Im glad your car survived! Hopefully the repairs will not be too extensive. Some guys I have read have pulled the inner wheel well liner to get to the latch as a last resort. I would make sure also, before you run it again, that the fuel that was being pushed through that failed diaphram into the pressure regulator vacuum line with key on engine not running. That fuel didnt make its way into the oil sump. I have read of engines worst case scenarios being hydrolocked by fuel from a pressure regulator diagphram failure. Maybe drain a quart and check if its cut with fuel. This diagphram is definitly an item we all should watch like a hawk especially with our great choice of alcohol enriched gas and the parts age nowadays.
Posted on: 2012/6/3 7:06
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Matatk Re: Recent fule pump change
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Common place for the FPR diaphragm yo rip. Happened in the same spot to me and Joe. Both of our regulators were only about 2 years old, too.

Any luck getting the hood open? There are some specs out there on how to make your own hood tool (like the one they sell in mags) to pop open the hinge. Then install the emergency cables.

Wiring didn't look too bad, but what kind of shape is it in when you inspect it by hand?

Matthew
Posted on: 2012/6/3 15:40
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milsurpman Re: Recent fule pump change
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Quote:

Matatk wrote:
Common place for the FPR diaphragm yo rip. Happened in the same spot to me and Joe. Both of our regulators were only about 2 years old, too.
Matthew


That is some serious junk. 2 years! Who is a maker of these junk diaphrams? I hope they all dont come from the same source nowadays.
Posted on: 2012/6/3 16:29
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istter1 Re: Recent fule pump change
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Quote:

Matatk wrote:
Common place for the FPR diaphragm yo rip. Happened in the same spot to me and Joe. Both of our regulators were only about 2 years old, too.

Any luck getting the hood open? There are some specs out there on how to make your own hood tool (like the one they sell in mags) to pop open the hinge. Then install the emergency cables.

Wiring didn't look too bad, but what kind of shape is it in when you inspect it by hand?

Matthew

http://content.mamotorworks.com/pdf/609637.pdf
http://www.mamotorworks.com/corvette- ... l+1984+1996-1-66-948.html
I am using the tool I bought from Mid America when I first bought this car. The hood was a lot looser then. The tool is moving the latch. When I was in an accident with a pit bull "the first one" the body shop made everything fit snug.

The fuel pressure worked like it was suppesto . Engine fired right up. Two blocks from the house the red light for heat 300 degree flashed oil pressure was 50-60 water temp 175. Took it right back to the house. It started running rough.

The wire going to the oil presure gauge was in the fire conected but burnt and the sensor may have been damaged.

There may be comintation in the oil. Will change when I get the hood open. It pured like a kitten.
Posted on: 2012/6/3 16:33
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Matatk Re: Recent fule pump change
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I bought the last one online I think...GM doesn't sell these anymore, all aftermarket. My most recent one was from TPIS, best price and supposedly good quality.

Matthew
Posted on: 2012/6/3 16:43
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istter1 Re: Recent fule pump change
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Well Harbor freight has a digital inspection tool on sale for $99. Will be giving that a try in a little while.

Gota figure out how to use it.
Posted on: 2012/6/3 18:29
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istter1 Re: Recent fule pump change
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Finally got scope positioned ran tool down and opened first try.

Harbor frieght

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Posted on: 2012/6/3 21:34
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istter1 Re: Recent fule pump change
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Is this the vacume line that runs the vents? I goes through this plug through the firewall.

Took vet over to my buddy's shop I am on vacation and stressing a little. Summer school classes start thursday got to get my class material ready to go for my students,

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Posted on: 2012/6/4 16:55
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Matatk Re: Recent fule pump change
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If that runs into the firewall with a big bundle of wires I believe it's the vacuum tube that controls the a/c vents. If I recall it should be surrounded by the "goop" that GM uses to hold it all together.

As far as having the hood open...now is the time to install the emergency release loops.

Matthew
Posted on: 2012/6/5 2:03
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istter1 Re: Recent fule pump change
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Quote:

Matatk wrote:
If that runs into the firewall with a big bundle of wires I believe it's the vacuum tube that controls the a/c vents. If I recall it should be surrounded by the "goop" that GM uses to hold it all together.

As far as having the hood open...now is the time to install the emergency release loops.Matthew


Al I can say about the loops now is Dahhhhhhhhh

they should have on as standard equipment
Posted on: 2012/6/5 3:29
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bogus Re: Recent fule pump change
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they do raise the risk of theft, but since no one steals these things anymore... who cares...
Posted on: 2012/6/5 6:15
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istter1 Re: Recent fule pump change
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Quote:

bogus wrote:
they do raise the risk of theft, but since no one steals these things anymore... who cares...


You are right and my insurance would never pay me for all the money I have put into this beast to make it a better car. LOL

Posted on: 2012/6/5 15:24
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istter1 Re: Recent fule pump change
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Quote:

istter1 wrote:
[quote]
Matatk wrote:
Common place for the FPR diaphragm yo rip. Happened in the same spot to me and Joe. Both of our regulators were only about 2 years old, too.

Any luck getting the hood open? There are some specs out there on how to make your own hood tool (like the one they sell in mags) to pop open the hinge. Then install the emergency cables.

Matthew

Heads repaired new gaskets on intake lots of tape and repaired wire. Lol

Picked up vett ac wasn't working. Lots of other things I needed the hood open to work on. Got my tool out took les then 20 minutes to open.
I didn't have any cable but I had metal tie downs so while i get the right material This wioo work. Lol

Going to figure out how to remove an inch of melted plastic from the burned cable covers and i will make the old ones work.

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Posted on: 2012/6/24 1:21
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Matatk Re: Recent fule pump change
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Try a wire stripper for the burnt cable platic. Otherwise a razor blade split it lengthwise then around the circumference.
Posted on: 2012/6/24 15:47
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flyboy Re: Recent fule pump change
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Westmont, Il.
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X-acto knife mebbe.
I wonder if that liquid electrical tape (3M) would be useful to coat the damaged wiring?
Posted on: 2012/6/24 19:00
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BillH Re: Recent fule pump change
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Quote:

flyboy wrote:
X-acto knife mebbe.
I wonder if that liquid electrical tape (3M) would be useful to coat the damaged wiring?


Probably but it would be messy.

The self sealing electrical tape would be better. It chemically bonds to itself after you stretch it and do the wrap. After it's bonded, it won't unravel, you have to cut it off with a knife.
Posted on: 2012/6/24 20:56
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