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post #1 of 6 Old 07-16-2011, 07:29 PM Thread Starter
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Fuel pump wiring

Hello. I have an 88 lx with the factory 5.0.

Having a problem with power on the fuel pump circuit. I'm not real good with electrical, but can work out the basics.

The issue is the car died while running in my friends driveway. after some quick checks, we found the FP wasn't running.

I then checked that the blue fuseable link (from the solenoid) has power. the relay under the drivers seat was bad and replaced. still no fuel pump.

Then I checked voltages to the the safety switch in the trunk, and the eec power relay.

Everything is good, except that the EEC Power Relay doesn't have power on the Black w OJ stripe wire. See picture...

http://www.veryuseful.com/mustang/te...nks-ign-ac.gif

With the blk/oj wire tapped and connected to the battery direct, the car runs fine. where do I go looking for the break in the wire?

it seems as if it comes off the solenoid (blue fuslink) and runs in a harness under the battery, and then I imagine it routes back through the firewall at the PCM. or does the other side of that circuit with the TFI and the ignition switch have any effect on it?

There is also another blue fuseable link in part of the harness right by the firewall on the pass side. I haven't torn into the harness there to check what it runs to. any suggestions welcome.

Rod.


2005 Saab 92x SAABARU
2003 Yamaha R1 RRATED
2000 Formula m6 INCONTT
1988 Mustang LX 5LTRLX
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post #2 of 6 Old 07-24-2011, 11:57 AM
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Have you gone as far as to check the voltage to the blk/orange wire at the EEC connector.You need to rule out if its the 20A fuse link at the solenoind or at the EEC connector.I would lean more towards a break somewhere near the fuse link.

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post #3 of 6 Old 07-26-2011, 04:53 AM Thread Starter
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yes, I checked that. I have no voltage at the blk/oj wire at the eec relay. There is power after the fuse/link coming off the solenoid, but somewhere after that there must be a break in the wire. Im guessing. I also found a fuse/link in part of the harness where it goes through the firewall on the pass side of the car. not sure yet what it goes to, but its a blue/20a? fuse/link as well.

guess its time to pull the pcm, and start checking wires that go through the firewall.

thanks for the reply.

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post #4 of 6 Old 12-11-2016, 12:14 PM
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Originally Posted by rod442 View Post
yes, I checked that. I have no voltage at the blk/oj wire at the eec relay. There is power after the fuse/link coming off the solenoid, but somewhere after that there must be a break in the wire. Im guessing. I also found a fuse/link in part of the harness where it goes through the firewall on the pass side of the car. not sure yet what it goes to, but its a blue/20a? fuse/link as well.

guess its time to pull the pcm, and start checking wires that go through the firewall.

thanks for the reply.
bringing this back from the dead, I've been searching all morning , on my 88 gt I have a 427 with pro-m, and the aero fuel pump wiring kit, it will fire off then die, like something is almost disconnected , just enough to let it fire off but not stay running,

I thought it was the fuel pump but just replaced it with a new aero stealth 340 and it's still doing the same thing.

did you figure out what your issue was

88 hatch 427 Dart FordStrokers,Tmoss ported SuperVic, Hi-Port 225's , Freezy custom cam, Pro-M engine management system with cnp,
Aero fuel pump wiring, alt upgraded wiring, Flex-a-Lite 52185 radiator/fan combo, T56 Magnum kit , built 8.8 rear-end 3:73 with 31 spline axles welded 03 Cobra center section.
might be ready to dyno and run it by next summer of 2017,LoL I hope!!
March 2018 new 2018 F150 super cab "Blue Lightning" 2.7 Twin turbo'd 10 speed automatic
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post #5 of 6 Old 12-11-2016, 08:09 PM
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stop buying parts!

until you know they are faulty

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #6 of 6 Old 12-11-2016, 08:31 PM
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Originally Posted by indy2000 View Post
stop buying parts!

until you know they are faulty
That's a Grt8 Idea , money's not flowing like it's been the last few years building this thing ,

88 hatch 427 Dart FordStrokers,Tmoss ported SuperVic, Hi-Port 225's , Freezy custom cam, Pro-M engine management system with cnp,
Aero fuel pump wiring, alt upgraded wiring, Flex-a-Lite 52185 radiator/fan combo, T56 Magnum kit , built 8.8 rear-end 3:73 with 31 spline axles welded 03 Cobra center section.
might be ready to dyno and run it by next summer of 2017,LoL I hope!!
March 2018 new 2018 F150 super cab "Blue Lightning" 2.7 Twin turbo'd 10 speed automatic
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