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Gass pump

Tiny
RAFAEL MORALES
  • MEMBER
  • 2003 JEEP GRAND CHEROKEE
  • 4.7L
  • V8
  • RWD
  • AUTOMATIC
  • 123,230 MILES
I mount the pump but didn't work. I take it off and jump it and works. Mount it back and don't work. I check relays and fuse, all good. Working now on cheqiing the voltage of the truck terminals.
In need of help.
Wednesday, February 10th, 2016 AT 7:42 AM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
So I guess you never tested for power arriving at the pump before replacing it?
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Wednesday, February 10th, 2016 AT 7:47 AM
Tiny
RAFAEL MORALES
  • MEMBER
  • 4 POSTS
Now I did, voltage is 0
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Wednesday, February 10th, 2016 AT 7:49 AM
Tiny
RAFAEL MORALES
  • MEMBER
  • 4 POSTS
I check first the relays and fuse
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Wednesday, February 10th, 2016 AT 7:50 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If the voltage was 0, why did you go ahead and replace the pump?

You do realize that only powers for 2 seconds when the key is first turned on and resumes when the computer sees a crank signal.
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Wednesday, February 10th, 2016 AT 8:10 AM
Tiny
RAFAEL MORALES
  • MEMBER
  • 4 POSTS
In the first 2 sec is a 2.0v then drop to.8v
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Wednesday, February 10th, 2016 AT 8:26 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Test it with the pump unplugged. It will be either battery voltage or nothing. Make sure you are not reading the fuel gauge.
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Wednesday, February 10th, 2016 AT 8:41 AM

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