gass pump

2003 JEEP GRAND CHEROKEE
123,230 MILES • 4.7L • V8 • RWD • AUTOMATIC
Avatar
RAFAEL MORALES
  • MEMBER
  • 4 POSTS
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.
Feb 9, 2016 at 11:42 PM
Advertisement
Avatar
WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 POSTS
So I guess you never tested for power arriving at the pump before replacing it?
Feb 9, 2016 at 11:47 PM
Avatar
RAFAEL MORALES
  • MEMBER
  • 4 POSTS
Now I did , voltage is 0
Feb 9, 2016 at 11:49 PM
Avatar
RAFAEL MORALES
  • MEMBER
  • 4 POSTS
I check first the relays and fuse
Feb 9, 2016 at 11:50 PM
Avatar
WRENCHTECH
  • ✓Experienced 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.
Feb 10, 2016 at 12:10 AM
Avatar
RAFAEL MORALES
  • MEMBER
  • 4 POSTS
In the first 2 sec is a 2.0v then drop to .8v
Feb 10, 2016 at 12:26 AM
Avatar
WRENCHTECH
  • ✓Experienced 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.
Feb 10, 2016 at 12:41 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.