Quick fuel pump question...
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
Quick fuel pump question...
Does the fuel pump need distributor reference pulses to stay on all the time?
I'm doing a carb conversion to the dark side and I need to keep the pump running constantly, i'm using a stock pump with a regulator and some nifty an lines
I'm doing a carb conversion to the dark side and I need to keep the pump running constantly, i'm using a stock pump with a regulator and some nifty an lines
Last edited by DrEvil11417; Sep 1, 2007 at 04:08 PM.
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
i haven't installed the ignition or anything yet, but when i turn the key to on it jumps up to 6psi for 5 seconds then drops down to zero as the pump cuts off
(im using a return line)
(im using a return line)
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Yes, it is normal for the fuel pump to prime for 2 seconds when the key is turned into the run position...if the distributor reference pulses are not seen by the ECM after the first 2 seconds the fuel pump relay drops out.
Thread Starter
Racer
Joined: Jul 2004
Posts: 389
Likes: 2
From: Howard Beach, NY
i have relays under the hood for the fan (aftermarket controller), and some other stuff.. could i just use the signal that turns the relays on with the ignition and run it right to the fuel pump relay?
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I have no idea what year you have, but it uses an oil pressure switch to power it in addition to the ECM command.
So all you need is a manual switch to run it while you turn the key... when there's no oil pressure. Or else wire the relay to the ignition switch.
Stock setup uses a ground input to the relay. So ground that permanently and switch the 12V input instead. GM screwed with the relay connections, the fp relay is connected differently than the fan relays.
So all you need is a manual switch to run it while you turn the key... when there's no oil pressure. Or else wire the relay to the ignition switch.
Stock setup uses a ground input to the relay. So ground that permanently and switch the 12V input instead. GM screwed with the relay connections, the fp relay is connected differently than the fan relays.
Last edited by CentralCoaster; Sep 2, 2007 at 03:51 AM.
