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Old 01-20-2012, 05:09 PM   #1
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2000 Mustang V6 Fuel Pump Harness Wire Chart? No start

I am working on a 00 V6 mustang that cranks but will not fire. It has spark. I suspect the fuel pump and want to apply 12V to the pump to see if it operates. I found a plug near the tank that has 7 pins/wires, but am not sure which colors to probe.

Can anyone point me in the right direction?

Thanks
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Old 01-20-2012, 05:35 PM   #2
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I just had a friend turn the key on while I listened near the fuel pump, and for a few seconds I did hear a whine.

There is a little valve on the fuel rail with a black cap. We stuck in a screwdriver thinking fuel would squirt out, but we got nothing, it barely seeped out.
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Old 01-20-2012, 11:21 PM   #3
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You need to check for voltage at the pump, not try jumping it. If it's not obvious, you need a wiring diagram for that car. If you have voltage, check fuel pressure with a fuel pressure test gauge, not by disconnecting a line which isn't safe when there's spark.
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Old 01-21-2012, 03:42 PM   #4
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I can't access PB at work, but when I get home I'll upload some electrical diagrams off AllData for you. Its for a 99 Cobra but I don't see the wires being much different, if at all, for the circuits we're talking about.
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Old 01-21-2012, 07:26 PM   #5
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Great! Please do as I'm going to try and work on this tomorrow.
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Old 01-21-2012, 08:15 PM   #6
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Powertrain diagram with the CCRM, which could be another culprit:


Actual fuel pump and relay circuit diagram


One more but this includes the fuel pressure transducer


As I mentioned, you may also want to look into the CCRM which is possibly the problem, as well as the FPDM (fuel pump driver module) located in the trunk kinda near the inertia switch
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Old 01-22-2012, 04:27 PM   #7
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Thanks for the diagrams. Unfortunately those are too complicated for me.

So I tested for voltage at the plug for the fuel tank and this is what I came up with.

Looking at the plug, there are 7 pins. If you look at it like this:

X X X X
...X X X

If they are number liked this:

1 2 3 4
...5 6 7

I get 11V at pin 4 and 5 volts at pin 7. Nothing on anything else.

The battery is brand new. Would this point to a bad CCRM not supplying a full 12V to the fuel pump or do you think the fuel pump would still work with that voltage and the fuel pump is bad? I do hear a brief whine by the tank when the key goes to the "On" position.
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Old 01-23-2012, 12:22 PM   #8
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I actually took my CCRM apart and tested the relays inside to make sure that one of them wasn't bad, but a quicker way would be to listen or have someone listen to it while the key is turned to "ON" - if you can hear the clicking then its probably alright.

One of the diagrams I posted showed the wire color for the connector that you are talking about, which is under the rear bumper, parallel to the rear bumper (runs side to side not front to back) so I know which one you are talking about. Not sure on which pin you should be testing though, just know it by color.

Have you confirmed at the fuel rail that there is no fuel coming up?
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Old 01-23-2012, 11:27 PM   #9
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I did hear some clicking near the passenger side fender. There is a small cap on the fuel rail and I thought a stem like in a tire and I pushed it, and no fuel came out.
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