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Fuel pump relay location?

Tiny
LARRYMCANTWELL
  • MEMBER
  • 2002 FORD F-350
  • V8
  • 4WD
  • AUTOMATIC
  • 139,000 MILES
I've just replaced the fuel pump on my 2002 Ford F 350 7.3l diesel. I want to replace the fuel pump (relay) but cant find it under the dash or in the connector area above the driver side under the hood. Can you tell me where I can fine the location of the switch? Thanks, Larry
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Monday, December 6th, 2010 AT 3:23 PM

8 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
This truck has a fuel pump module that has a relay which is not serviced separately and you have an inertia switch that can give you trouble as well. Here is a a guide to help you a test on the relay once you find it from the diagrams below.

Fuel Pump Relay - Part of central junction box (not serviceable separately).

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below) Please let us know what you find.
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Monday, December 6th, 2010 AT 3:39 PM
Tiny
LARRYMCANTWELL
  • MEMBER
  • 3 POSTS
My mechanic recommended this replacement and when I purchased the part there was no question as to its use. The part is a BWD, # R3189. It appears to be a end connection, IE it is a one way male fitting. ( Thus the switch function I suppose ). Does that help? Thanks, Larry
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Monday, December 6th, 2010 AT 6:07 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Is there a running problem or just wanted to put that relay in?
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Monday, December 6th, 2010 AT 7:41 PM
Tiny
LARRYMCANTWELL
  • MEMBER
  • 3 POSTS
Well there was a running problem. The truck just stopped. I managed to get it started the next day and drove it a block to my mechanic when it died while I was parking it. They tried to start it but couldn't. After a day or so of trying to start it they took the fuel line off to test pressure ( it was nil ) they put things back together and it started. They couldn't get it to fail again and no code messages. I drove it home a short distance and could tell it wasn't running right. I couldn't afford the 700.00 fix so installed the pump myself. It runs great now, but I was told that I should replace the switch also. Hope that helps. Thanks, Larry
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Monday, December 6th, 2010 AT 7:53 PM
Tiny
IMEURNOT
  • MEMBER
  • 2 POSTS
  • 1994 FORD F-350
  • V8
  • AUTOMATIC
1994 F350 Stakebody no power to fuel pumps or inertia switch. Checked all fuses and relays. What should I check next?
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Friday, September 11th, 2020 AT 11:28 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
What is litre size of engine? At the applicable fuses, did you check for voltage at the fuse circuit, use voltage tester. Even if the fuse is good if no voltage on the circuit, the circuit is dead. Any applicable trouble codes?
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Friday, September 11th, 2020 AT 11:28 AM (Merged)
Tiny
IMEURNOT
  • MEMBER
  • 2 POSTS
Correction, it's a 1995. It is a 5.8L. I'm getting voltage to the fuel pump supply fuse. I don't have a tester to get trouble codes.
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Friday, September 11th, 2020 AT 11:28 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
In the diagram, the yellow wire is hot all the time. The red wire is voltage for coil side of relay comes from pcm relay. Engine cranking do you have spark at the plugs?
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Friday, September 11th, 2020 AT 11:28 AM (Merged)

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