Fuel pump on with engine off?
Thread Starter
Honda-Tech Member
Joined: May 2009
Posts: 119
Likes: 0
From: Ca
Fuel pump on with engine off?
I bought a k-swapped integra the other day and i am still finding little "jimmy rigs" here and there. As of right now there is no fan switch/coolant temp sensor so both fans run constantly. Because of that, I was never able to hear the fuel pump prime, then turn off, when the ignition is on. Today I was doing some wiring and had the ignition on (car still off) with the fans unplugged and I noticed that the fuel pump just stays on. I looked at the fpr and saw fuel pressure at about 60 psi psi. I haven't looked into this yet but does anyone know why this is happening?
Thread Starter
Honda-Tech Member
Joined: May 2009
Posts: 119
Likes: 0
From: Ca
Re: Fuel pump on with engine off?
EDIT: I looked at the ecu and its a PRC-013 type r ecu.
Last edited by 8OOSTED; Oct 14, 2010 at 07:16 PM.
Old Fart
Joined: May 2004
Posts: 26,173
Likes: 18
From: kelowna, bc, canada
Re: Fuel pump on with engine off?
You will need to drop the PGM-FI Main Relay and test some wiring, is the fuel pump still wired to the PGM-FI Main Relay or has it also been "hard wired" like the rad fans?
Unplug the PGM-FI Main Relay and see if the pump keeps running, if not plug the relay back in and do the below tests.
Test the yellow/green lead at the PGM-FI Main Relay, it is the fuel pump power lead, it should be hot, [12V+] for a few sec. when ign. switch is turned to run, if it stays hot continuously, test the green/blue lead, [ground output from ECU/ECM] it should be ground for only a few sec. when ign. switch is turned to run, if it stays as a ground as long as ign. switch is on the problem is the ECU/ECM, if not, [ground "lifts" after a few sec. then either the fuel pump relay in the PGM-FI Main Relay is seized closed or the fuel pump has been wired direct to ign. power. 94
Unplug the PGM-FI Main Relay and see if the pump keeps running, if not plug the relay back in and do the below tests.
Test the yellow/green lead at the PGM-FI Main Relay, it is the fuel pump power lead, it should be hot, [12V+] for a few sec. when ign. switch is turned to run, if it stays hot continuously, test the green/blue lead, [ground output from ECU/ECM] it should be ground for only a few sec. when ign. switch is turned to run, if it stays as a ground as long as ign. switch is on the problem is the ECU/ECM, if not, [ground "lifts" after a few sec. then either the fuel pump relay in the PGM-FI Main Relay is seized closed or the fuel pump has been wired direct to ign. power. 94
Thread Starter
Honda-Tech Member
Joined: May 2009
Posts: 119
Likes: 0
From: Ca
Re: Fuel pump on with engine off?
You will need to drop the PGM-FI Main Relay and test some wiring, is the fuel pump still wired to the PGM-FI Main Relay or has it also been "hard wired" like the rad fans?
Unplug the PGM-FI Main Relay and see if the pump keeps running, if not plug the relay back in and do the below tests.
Test the yellow/green lead at the PGM-FI Main Relay, it is the fuel pump power lead, it should be hot, [12V+] for a few sec. when ign. switch is turned to run, if it stays hot continuously, test the green/blue lead, [ground output from ECU/ECM] it should be ground for only a few sec. when ign. switch is turned to run, if it stays as a ground as long as ign. switch is on the problem is the ECU/ECM, if not, [ground "lifts" after a few sec. then either the fuel pump relay in the PGM-FI Main Relay is seized closed or the fuel pump has been wired direct to ign. power. 94
Unplug the PGM-FI Main Relay and see if the pump keeps running, if not plug the relay back in and do the below tests.
Test the yellow/green lead at the PGM-FI Main Relay, it is the fuel pump power lead, it should be hot, [12V+] for a few sec. when ign. switch is turned to run, if it stays hot continuously, test the green/blue lead, [ground output from ECU/ECM] it should be ground for only a few sec. when ign. switch is turned to run, if it stays as a ground as long as ign. switch is on the problem is the ECU/ECM, if not, [ground "lifts" after a few sec. then either the fuel pump relay in the PGM-FI Main Relay is seized closed or the fuel pump has been wired direct to ign. power. 94
Old Fart
Joined: May 2004
Posts: 26,173
Likes: 18
From: kelowna, bc, canada
Re: Fuel pump on with engine off?
Going to have to find that connection and reconnect the fuel pump lead back to the PGM-FI Main Relay, have you tested the PGM-FI Main Relay wiring at the plug to make sure the pump was not rewired because the PGM-FI Main Relay is not working, or wiring to it.
The fuel injector relay in the PGM-FI Main Relay must be working, [engine runs] you need to test the fuel pump relays output, [yellow/green] for power, both for a few sec. of priming and constant output once engine is running. 94
The fuel injector relay in the PGM-FI Main Relay must be working, [engine runs] you need to test the fuel pump relays output, [yellow/green] for power, both for a few sec. of priming and constant output once engine is running. 94
Thread
Thread Starter
Forum
Replies
Last Post
EusebioSam19
Honda Civic / Del Sol (1992 - 2000)
1
Nov 22, 2010 09:21 PM
iNDyCRX
Honda CRX / EF Civic (1988 - 1991)
2
Apr 24, 2008 12:54 PM
94delsol6428
Honda Civic / Del Sol (1992 - 2000)
7
Dec 27, 2006 07:06 PM
