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Fuel pump wiring diagrams?

Tiny
DMINION
  • MEMBER
  • 1994 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 70,000 MILES
Where is the ground wire located at for the fuel pump. Fuel pump has been checked nothing wrong with it. Truck turns over but doesnt fire electrical code of 542 was reading.
Thursday, January 22nd, 2009 AT 8:18 PM

10 Replies

Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
The ground is on top of the radiator support which can become loose or broken.


https://www.2carpros.com/forum/automotive_pictures/266999_fuel_10.jpg



Here is a fuel pump wiring diagrams and a guide to help you fix the problem.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Let us know what happens and please upload pictures or videos of the problem.

Cheers
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Thursday, January 22nd, 2009 AT 8:48 PM
Tiny
DMINION
  • MEMBER
  • 2 POSTS
I have already checked the inertia switch, and it was not triggered, although I reset it any way just to make sure. And it was located on the passenger side on the kick panel. My truck seems to be the complete opposite of what its supposed to be I swear. Any other suggestions? I am at a complete loss of ideas right now. Thanks
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Friday, January 23rd, 2009 AT 2:39 AM
Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
Is the vehicle definitely not getting fuel ? and there is definitely a hot feed to pump ..if yes .. check the ground(orange)wire near the top of radiator support or ground the pump(orange wire) to another ground point near the pump on the chassis somewhere .. or you could run a hot and ground direct from battery through a switch to the pump so you can check it is working correctly ?? making sure you remove the original hot and ground wires from pump ? let me know

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

Check out the diagrams (Below). Please let us know what you find.
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Friday, January 23rd, 2009 AT 8:22 AM
Tiny
DIRTIETRUCK
  • MEMBER
  • 3 POSTS
  • 1993 FORD F-150
I have a 5.8L with a rear mount aft fuel tank. I dropped the tank to replace the leaf spring hangers. The plug on the sending unit just crumbled apart as the tank was lowered. Now I am not sure which wire goes on which post of the sending unit, and will the fuel pump work with out that plug just by snapping the end of the wires to the posts?

These are the sire colors:
Two wires are fatter than the other two

The two fat wires= orange and the other is black (or dark brown) with a white stripe.

The two thinner wires= black and the other is yellow with green stripe.
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Saturday, May 29th, 2021 AT 11:21 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi dirtietruck,

Thank you for the donation.

Here are the schematics:

The thicker wires are for the fuel pump and they would work if you plug them in without the connector but ensure connections are tight as the fuel pump draws a rather high current and would heat up if connection is loose.

Orange = Pump ground.
Brown/White = Pump power.
Yellow/Light Blue = Sendersdignal
Black = Sender ground or return.


https://www.2carpros.com/forum/automotive_pictures/192750_Fuel_Pump_Connector93F150_1.jpg




https://www.2carpros.com/forum/automotive_pictures/192750_Fuel_Pump_Connector93F150a_1.jpg

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Saturday, May 29th, 2021 AT 11:21 AM (Merged)
Tiny
KJHAWK11
  • MEMBER
  • 1 POST
  • 1992 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
I bought a new fuel pump and sending unit for my truck and the new wire harness has a round plug in the one on my truck has a plug that has 4 plug in that are straight across if I cut that plug on off what are the wire colors I use to use the new style plug
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Saturday, May 29th, 2021 AT 11:21 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Is the new wiring harness color coded? If so just match up the colors, hopefully that will work? I did look at the connectors online parts book. The motorcraft connector is round. The aftermarket Standard connector is flat with four pins in a row. Are the connector pins numbered or lettered?
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Saturday, May 29th, 2021 AT 11:21 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
These are the wire colors, if that helps?
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Saturday, May 29th, 2021 AT 11:21 AM (Merged)
Tiny
EDWARD6984
  • MEMBER
  • 1 POST
  • 1989 FORD F-150
I am not getting power to the yellow wire going to the fuel pump relay the red and tan have power but the yellow should have power at all times I cant figure out why it doesn't have power where would I find the fuse link in the wire
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Saturday, May 29th, 2021 AT 11:21 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The fusible link is blue a 20 gauge wire at the starter relay. See below

Good Luck


https://www.2carpros.com/forum/automotive_pictures/12900_fuel_pump_relay_12.jpg

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Saturday, May 29th, 2021 AT 11:21 AM (Merged)

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