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Unread 05-27-2009   #1 (permalink)
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Default 2000 Mustang GT fuel pump issues Please help!

I believe it is not starting because it is not getting fuel. The fuse is good in the fuse box under the hood. I have changed out the Fuel pump driver module and the CCRM in the front passanger wheel well and I am still not getting power to the fuel cutoff switch. Any ideas? Is the fuel cutoff switch supposed to have power running through it? I have no fuel pressure on the fuel rail can that mean that the fuel pump is out and would that affect the fuel cutoff switch?

Please help!!!!

Thanks for all your help!!

Dave
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Unread 05-27-2009   #2 (permalink)
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Welcome to the forums!go over it once more and make sure the wires are on right.

have some one turn the key and stick your ear down there and see if you can hear it prime
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Unread 05-27-2009   #3 (permalink)
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It ran fine and then nothing. I have changed everything people have told me that can go out. Does the fuel cut off switch have power to it?
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Unread 05-27-2009   #4 (permalink)
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Default Fuel Inertia Switch!

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Originally Posted by 1sickstang View Post
It ran fine and then nothing. I have changed everything people have told me that can go out. Does the fuel cut off switch have power to it?
Yes, with your ignition switch on, you should have voltage at both ends of the inertia switch for 2 to 3 seconds. That is if the switch is working properly. The red button on the inertia switch should be pressed down, and should stay down. When it is down, voltage should flow through the switch then to the fuel pump. If your engine is not starting, (like in your case) you will only see voltage for 2 or 3 seconds. So, have someone turn your ignition switch to the on position while you test for voltage at the inertia switch. Test both sides of the inertia switch. If you don't have voltage at either end of the inertia switch with your ignition switch on for 2 to 3 seconds, that would indicate problems with your CCRM. The CCRM is a multiple relay module which supports various circuits, the fuel pump is one of those circuits. If you do have voltage at both sides of the inertia switch, then test the wire connector at the rear of the gas tank, just above the bumper. Disconnect the wire connector and test the side that runs to the inertia switch. If you have voltage there with the ignition switch on for 2 to 3 seconds, that would then indicate that your fuel pump went bad. I'm thinking you are testing for voltage by yourself, and by the time you get to the inertia switch, the 2 to 3 seconds has passed by and that's why you don't see any voltage at the inertia switch. Let us know how things turn out. Hope this helps, Tommy.
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Unread 05-29-2009   #5 (permalink)
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The fuel cutoff is not getting power at all not even for a few seconds.
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Unread 06-05-2009   #6 (permalink)
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Default Fuel inertia switch has no voltage?

Quote:
Originally Posted by 1sickstang View Post
The fuel cutoff is not getting power at all not even for a few seconds.
Have you found your problem yet? If you don't have power at your inertia switch, then you have to back track to your Constant Control Relay Module. On some years, it is located under one of the front seats. On other years it is located under the passenger side front fender. Between the front fender and fender well, just forward of the strut tower foundation. The CCRM is a multi function relay which supports I believe 3 circuits. Your ac, your fan, and your fuel pump. There should be 3 relays installed inside the module. You need to find out which one supports your fuel pump and test for voltage. I believe to get at the module, the fender has to be removed. I can look for an electrical diagram if you want to do you own troubleshooting. Have you checked out and tested any of the fuses for the fuel system? Let me know, Tommy.
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Unread 06-05-2009   #7 (permalink)
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Default 2000 GT Mustang Fuel Pump Wiring Diagram

Here is a wiring diagram for a 2000 GT Mustang fuel pump circuit, which is posted in 3 sections. That's the only way I could post it. This should be of help to you as it shows you how the circuit is being supplied with power and where the wires are running to. I high-lited some of the wires just to make it easier for you to trace. The colors I used have no bearing on the actual colors of the wiring. The actual color of the wires are clearly marked for you to see. Please note where your fuses are and their sizes. These fuses must be checked and tested with a tester. A visual test is not good enough to determine if the fuses are good or not. In the last diagram, the Brown/Pink wire is the hot wire, and the Red/Black wire is the ground wire. These two wires are the wires that run directly to your fuel pump. So, if you are not getting voltage at your inertia switch, you need to trace back to your Constant Control Relay Module. Check to see if you are getting voltage coming out from the Pink/Black wire of the Constant Control Relay Module. Your Fuel Pump Relay located inside your Constant Control Relay Module may have gone bad. Hope this helps. Good luck, Tommy.



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Unread 06-06-2009   #8 (permalink)
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Default Correction!

CORRECTION! Sorry, you need to check the Dark Green/Yellow wire coming out of the CCRM, not the Pink/Black wire. That is the wire that is coming from your fuel pump relay inside the CCRM. Remember you will only see voltage for 2 to 3 seconds with the key in the on position. So you need a helper to turn the key on while you test the wire for voltage. If you have voltage there and none at the inertia switch, that means somewhere between your CCRM and Inertia Switch, a wire is open or cut. Be sure to check your fuses again with a tester. Hope this helps, Tommy.
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Unread 06-06-2009   #9 (permalink)
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Default FPDM and Inertia Switch Locations!

I got this picture from a forum site. Your Fuel Pump Driver Module and Inertia Switch is located inside your trunk on the driver side in the back of the cover panels. Your FPDM is identified with the red circle and your Inertia Switch is identified by the blue circle. Hope this helps. Good luck, Tommy.

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Unread 01-19-2010   #10 (permalink)
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Default i have the same problem

my 2000 gt did the same thing, go back to your fuel pump driver module and locate pin #3, then ground it if the fuel pump comes on and runs, then i would look at the pcm>fuel driver module harness.
if id doesnt come on but makes a slight arc. then the fuel pump is shot.
mine was caused by some shitbag who poured a bunch of stuff in my gas tank.
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Unread 4 Weeks Ago   #11 (permalink)
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Hello silver mustang and chilledbust im having the same problem about the fuel pump on a gt 2000 4.6l. i followed the instructions given by you guys as described by the wiring diagrams and instructions, i confirmed voltage 12 v dc from the brown/pink # 10 wire and body ground aka (tail pipe). then i grounded wire # 3 from the Fuel pump driver module to body ground. now the pump does work and my car is running. Thanks!! now is it safe to run my car like that or a new fuel pump drive module wuold fix it right? Thanks!!
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