will turn over fine on its own, but will not start?

1998 GMC JIMMY
200,000 MILES • V6 • 2WD • AUTOMATIC
Avatar
CHRISXXX9876
  • MEMBER
  • 4 POSTS
If you jump it off it usually will start even though it was turning over strong on its own, and once started usually has no more issues until next day. Recently though jumping doesn't help and may not start soon after shutting it off it.
Aug 18, 2022 at 8:36 PM
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,267 POSTS
This sounds like a classic fuel pump failure, with the jump box on it the voltage is a little higher which makes the fuel pump work. Here is how you can change the pump out in the images below. Let me know how it goes.
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Aug 19, 2022 at 2:44 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.