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Engine cranks but does not start?

Tiny
BEHIGHERED
  • MEMBER
  • 2008 FORD CROWN VICTORIA
  • 4.2L
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
When the key is turned to on position, the fuel pump doesn't kick in. When FPDM is bypassed using jumper wires, the fuel pump engages and runs 100%. Grounds are looking good, used multi meter, FPDM is getting 12v. FPDM was replaced and no result. Please help!
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Wednesday, July 31st, 2024 AT 5:19 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,911 POSTS
Hi,

For power to reach the FPDM, it has to come from the fuel pump relay and through the inertia switch. Have you checked the switch? Also, the FPDM is what controls the voltage to the pump. However, power must go through the inertia fuel shut off switch first.

I you haven't already, try resetting it. It is located in the trunk, driver's side behind a panel.

Let me know.

Joe

See pic below.
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Wednesday, July 31st, 2024 AT 8:33 PM
Tiny
BEHIGHERED
  • MEMBER
  • 2 POSTS
We worked it back to a broken fuse. New FPDM on the way. Maybe a bad new product?
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Friday, August 2nd, 2024 AT 8:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,469 POSTS
Here is a new guide that can help but is sounds like you found the problem.

https://www.2carpros.com/articles/car-cranks-but-wont-start

Here is the location of the FPDM which is in the truck and how to change it out. Check out the images (below). Please let us know what happens.
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Saturday, August 3rd, 2024 AT 5:56 PM

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