Fuel pump not coming on - Ford Mustang Forum
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post #1 of 10 (permalink) Old 3 Weeks Ago Thread Starter
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Fuel pump not coming on

I have a 02 mustang GT I just purchased and fuel pump will not come on.Someone changed wiring harness and I replaced and hope I got all wires right Problem I when I urn car over I can not hear fuel pump and am not getting pressure I replaced fuel pump and checked before installing it works Checked fuses and they are good I checked voltage to and from inertia switch and I have 12 volts on both wires when I am turning engine over but still caint hear fuel pump.Hope someone can help me Please tell me what I need to do next THANK YOU VERY MUCH am looking forward to you response

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post #2 of 10 (permalink) Old 3 Weeks Ago
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Is the ecm sending the signal for the pump to turn on....is there juice from the relay to the pump?


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post #3 of 10 (permalink) Old 3 Weeks Ago
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You should have a "fuel pump test lead" coming out of the harness near the firewall (engine side). You can apply 12v. to it with a jumper wire and should be able to hear the pump run and have pressure to your fuel injectors. Have you checked for an in-line filter in the system?
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post #4 of 10 (permalink) Old 3 Weeks Ago
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If you're getting voltage all the way to the inertia switch, then it sounds like the PCM and the relay inside the CCRM are good. The next item in the circuit between the inertia switch and the pump should be the fuel pump driver module. I think I would check for voltage there next.

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post #5 of 10 (permalink) Old 3 Weeks Ago
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Start with the basics. Is the PCM even alive?

Turn the key on but do NOT crank. Does the check engine light come on? IF not, suspect that the PCM is not even alive.

Does the theft light go out after a 3 second "prove out"? If yes, this means that the key has been accepted and PATS is authorized. Soooooooooooo any problem would NOT be PATS related.

Does the check engine light go out during cranking? IF yes, this means the PCM is receiving a CKP signal.

IMO it's silly to start the hard diagnosis on the fuel pump driver module until some of the basic items have been verified.
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post #6 of 10 (permalink) Old 2 Weeks Ago Thread Starter
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When I turn key on theft light blinks slow .When I turn engine over theft light blinks faster
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post #7 of 10 (permalink) Old 18 Hours Ago Thread Starter
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Mr Burns when I turn key on the theft light blinks slow and when I turn engine over it blinks faster. If I spray fuel in throttle body the car will start and run as long as I spray fuel in throttle body What do you believe I should try next
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post #8 of 10 (permalink) Old 17 Hours Ago Thread Starter
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Do you know what voltage should be on which wires I am getting volts at inertia switch 12 volts on both wires and also when I turn key on theft light blinks slow when I turn over it blinks faster but car will start as long as I spray fuel in throttle body how would you check module I haven't checked that THANKS FOR YOUR HELP Ibeen in hospital haven't been able to work on till now
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post #9 of 10 (permalink) Old 7 Hours Ago
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Quote:
Originally Posted by Bones1228 View Post
Do you know what voltage should be on which wires I am getting volts at inertia switch 12 volts on both wires
Best to use a test light that will load the circuit. But you should have 12 volts on both sides of the trunk mounted IFS switch.

You do realize that IF you had an ODB2 scanner with bi-directional capabilities that you could simply "command" the PCM to run the fuel pump? Image how different the trouble shooting process would be IF you had this ability. A $30 USB device will pay for itself many times over with the wealth of information it can provide.

ForScan ODB2 scanner w ELM327 USB
https://www.stangnet.com/mustang-for...elm327-usb.57/

1996+ Crank with no start check list
https://www.allfordmustangs.com/foru...e.html#2984838

NOTE: 1996+ Ford Factory PATS does NOT disable the fuel pump. So an anti-theft (PATS) issue is NOT the reason why the fuel pump isn't running. You may also have a PATS problem but it will be in addition to the fuel pump problem.

Further. Anytime the motor will not start because of PATS, it always sets a DTC code that points to PATS as the reason. Do you have any DTC codes stored in the PCM?

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post #10 of 10 (permalink) Old 50 Minutes Ago Thread Starter
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Mr Burns Thank you I will go buy a OB2D SCANNER When I get I will see if I know what I am doing if not I will let you know Thank you for your help
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