How does the stock fuel pump turn on and off?
Thread Starter
Supreme Member
Joined: Mar 2005
Posts: 1,665
Likes: 3
From: Benzie, MI
Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
How does the stock fuel pump turn on and off?
What turns the fuel pump off after pressure has been achieved? Is there some way to wire this in with my A1000, so it isnt on all the time?
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Joined: Jun 2001
Posts: 9,550
Likes: 4
From: Charleston, SC
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
the ECM triggers the fuel pump relay.
when you turn the key on, the ECM kicks the fuel pump on for a set peroid of time (not a specific pressure)... usually this is like 3 or 5 seconds. (i dont remember the specific time, but its in the tune)
as long as the ECM recieves a RPM signal from the car, or if the oil pressure is good, it keeps the pump running.
you can use this feature with your pump by retaining the factory relay setup, or by having the same relay trigger wired hooked into your new fuel pump relay.
when you turn the key on, the ECM kicks the fuel pump on for a set peroid of time (not a specific pressure)... usually this is like 3 or 5 seconds. (i dont remember the specific time, but its in the tune)
as long as the ECM recieves a RPM signal from the car, or if the oil pressure is good, it keeps the pump running.
you can use this feature with your pump by retaining the factory relay setup, or by having the same relay trigger wired hooked into your new fuel pump relay.
Thread Starter
Supreme Member
Joined: Mar 2005
Posts: 1,665
Likes: 3
From: Benzie, MI
Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Well im leaving the stock pump in the tank for now until I put a bigger motor in, could I run them both off the same relay? Running one relay to the next, but using of course power from the battery to the pump?
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