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Getting power on ground wire but no power to fuel pump?

Tiny
KHENRI
  • MEMBER
  • 1992 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 220,000 MILES
Getting power on ground wire but no power to fuel pump. There is power on main yellow wire power on red ignition switch and power on ground wire on back of fuse box, fuel pump shorted inside fuel tank on red wire, so we are trying to replace with new fuel pump no power to pump (4.9L)
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Sunday, December 16th, 2007 AT 12:53 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have you check the fuel pump relay and inertia switch? Here is the engine and fuel pump wiring diagrams with a guide to help you do some testing.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Monday, February 15th, 2021 AT 9:54 AM
Tiny
KHENRI
  • MEMBER
  • 4 POSTS
Both switches have been checked and they are okay.
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Monday, February 15th, 2021 AT 9:54 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have power at inertia switch dark green/yellow? When key is in On position
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Monday, February 15th, 2021 AT 9:54 AM
Tiny
KHENRI
  • MEMBER
  • 4 POSTS
Have power on ground wire from fuel pump relay to 60 pin plug, ground to fuel pump has no power from
cab to fuel pump, power from switch to relay is good
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Monday, February 15th, 2021 AT 9:54 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a dark green and yellow wire at the fuel pump connector? When the ECU energizes the fuel pump relay all you got is 2 secs to check for power at the pump connector. When the truck fires up the inertia switch powers the pump.

Check for power at pin No.8 at ECU.


https://www.2carpros.com/forum/automotive_pictures/12900_4_3.jpg

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Monday, February 15th, 2021 AT 9:54 AM
Tiny
KHENRI
  • MEMBER
  • 4 POSTS
Thank you, you been very helpful I will check out the things you have pointed out. Also do you make housecalls lol!
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Monday, February 15th, 2021 AT 9:54 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I'll be waiting for your return if further assistance is needed. BTW I don't think! My husband would like that-sorry. Lol
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Monday, February 15th, 2021 AT 9:54 AM

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