Power to the fuel pump but fuel pump not working

Tiny
OWENHENNINGS
  • MEMBER
  • 1999 LINCOLN NAVIGATOR
  • 5.4L
  • V8
  • AWD
  • AUTOMATIC
  • 265,000 MILES
When I turn the key to start it the relays click and the engine turns over. I have checked the power to the fuel pump and the holes are when I checked it about 10. I have checked the relays I replaced by 10 relays and just do not know where to go from here I had it running about a month ago and then the battery went bad so I put a new battery in and now I have no fuel pump everything else works but the fuel pump not kicking in.
Wednesday, August 24th, 2016 AT 6:08 AM

16 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Have you verified power arriving at the fuel pump?

Have you verified ground at the fuel pump?
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Wednesday, August 24th, 2016 AT 6:33 AM
Tiny
OWENHENNINGS
  • MEMBER
  • 8 POSTS
Yes, I have power to the pump what stumps me is all the relays clicking never herd that before.
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Wednesday, August 24th, 2016 AT 6:34 AM
Tiny
OWENHENNINGS
  • MEMBER
  • 8 POSTS
I did put a new ignition switch in and it would not even crank over with the old switch in and it will crank over.
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Wednesday, August 24th, 2016 AT 6:44 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Okay, you are all over the board here. I do not how the ignition switch came into a fuel pressure problem. I hope it was not the key and tumbler that you changed because that will require programming.
If you have a fuel pump issue, concentrate on that.
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Wednesday, August 24th, 2016 AT 6:49 AM
Tiny
OWENHENNINGS
  • MEMBER
  • 8 POSTS
I tested the power back to their using the the wire ground that is in the same harness but I do think I am going to go home and check the connection for the ground on the intake manifold. I did have to replace that, but I am not sure if it is getting good contact with the firewall.
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Wednesday, August 24th, 2016 AT 6:50 AM
Tiny
OWENHENNINGS
  • MEMBER
  • 8 POSTS
The lovely Advance Auto Parts people came up with the idea that it could be the ignition that is causing the problem, but obviously it is not.
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Wednesday, August 24th, 2016 AT 6:51 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
What does the engine ground have to do with a fuel pump? If you do not have a good bit of electrical knowledge and the ability to read a wiring diagram, you are going to need local help with this.
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Wednesday, August 24th, 2016 AT 6:54 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The people at Advance are not mechanics. They are part time parts sales people that like to make believe they are mechanics.
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Wednesday, August 24th, 2016 AT 6:55 AM
Tiny
OWENHENNINGS
  • MEMBER
  • 8 POSTS
Okay; last question; am I able to make my own power supply to see if the pump is still active if pump will work?
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Wednesday, August 24th, 2016 AT 6:57 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
These tests are possible, but I do not know if you are the guy to attempt this. Applying power to the wrong wire can result in a lot of damage.

https://www.2carpros.com/images/external/219579047.gif
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Wednesday, August 24th, 2016 AT 7:03 AM
Tiny
OWENHENNINGS
  • MEMBER
  • 8 POSTS
OK update took fuel tank out tested pump and it shot fluid out what is the module with the 3 small wires could that cause it not to send fluid? I can't find that part
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Wednesday, August 24th, 2016 AT 5:36 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I have no idea what you are looking for. That test you did doesn't prove much of anything. It needed to be done while still in the car with a fuel pressure gauge hooked up.
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Wednesday, August 24th, 2016 AT 5:40 PM
Tiny
OWENHENNINGS
  • MEMBER
  • 8 POSTS
That's the whole problem no pumping until I took it out but would the pump still pump if the piece that twists onto the top of the fuel pump
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Wednesday, August 24th, 2016 AT 5:58 PM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Yes it would it is externally grounded.
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Tuesday, August 30th, 2016 AT 10:39 AM
Tiny
OHENNINGS
  • MEMBER
  • 3 POSTS
Not external ground all in the wire harness
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Wednesday, August 31st, 2016 AT 1:01 PM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
It is a black wire, here is a diagram to help you.
Image (Click to make bigger)
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Wednesday, August 31st, 2016 AT 2:51 PM

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