Subject: Re: 91 Corvette Convertible fuel pump issue by Matatk on 2013/8/12 1:22:29
Quote:
Matatk wrote:
I believe there is a delay on my 89 if you turn the car ignition on the fuel pump energizes, but then if you turn if off and turn it back on immediately it doesn't. I don't recall exactly.
Matthew
I checked the 89 fsm and it made no reference the the delay. It said basically once the ignition is turned on the ecm sends a reference signal to the fuel pump relay to energize. It will run for approximately 2 seconds and monitor for injector pulses. If there are no injector pulses, the ecm cuts the signal to the relay.
It does say in the flow chart, however, when testing to wait 10 seconds before turning on the ignition between tests. I don't know why, maybe that's what I was thinking of before.
