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Fuel pump relay location

Tiny
HALL618
  • MEMBER
  • 2001 FORD EXPLORER
Where is the fuel pump relay?
Wednesday, February 17th, 2010 AT 4:10 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The fuel pump relay is located under the hood. Here is a guide to help you test it and the location of the relay in the diagrams below:

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

Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.

Cheers
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Wednesday, February 17th, 2010 AT 4:13 PM
Tiny
SF_GRAY
  • MEMBER
  • 1 POST
  • 1999 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
I have a V6 SOHC. In the summer it has a sporadic starting issue. The vehicle will crank fine, but does not even attempt to "hit". I have tried different keys in case it is a chip issue, cycled gear selector in case it is a safety switch issue, tried foot on brake, tried neutral start, no good. In the couple times I have remembered to listen, I hear the fuel pump. Usually this happens to my wife, by the time I get there it starts, but it has now happened to me twice. I have found that when this is happening, I can spray start fluid in air box, and it will immediately start. Once started, and on the majority of the time when it starts fine, it runs fine. This seems to be a fuel issue, but I cannot narrow down what is happening. I did replace fuel pump relay, with no change in condition. The local shops cannot find it, because nothing shows on diagnostic computer. This has never happened outside of the summer months. Please help!
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Wednesday, September 26th, 2018 AT 12:32 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Next time it does it, go behind the right front kick panel, locate the fuel inertia switch, has a two wire connector, be sure you have power on both sides of the switch. This is the last thing before the pump. Even if you hear the pump running it may be too weak to run the system. Installing a manual fuel pressure gauge to verify this is the best way to be sure, should be a schrader valve on the fuel rail to test at.
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Wednesday, September 26th, 2018 AT 12:32 PM (Merged)
Tiny
KENNETH D SABOL
  • MEMBER
  • 3 POSTS
  • 2001 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 109,000 MILES
Thank you for the advise about the things to do before replacing the pressure regulator. But I am not sure how to check for pressure before the filter?
As far as that goes there is fuel flow at that point and plenty of it I am going to try the three things you mentioned. Just to recap. 1. Remove vacuum hose at the pressure regulator if pressure increases replace the regulator. 2. Pinch off the rubber fuel hose on the return line if pressure increases replace the regulator. Thanks again for the advise and I will be back to let you know how things turned out.
Thank you, Ken
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Wednesday, September 26th, 2018 AT 12:32 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi:
I think I answered your question yesterday. Just reply back to this post so I continue to get it. Otherwise it just gets added to a list.

As far as the pressure before the pump, basically, all you need is an adapter that fits between the fuel line and the filter. It is easy to do. For all we know, the filter may be plugged causing low pressure at the rail.

Let me know what you find or if you have other questions. Remember, add to this post or I may not see it.

Joe
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Wednesday, September 26th, 2018 AT 12:32 PM (Merged)

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