what causes you to not get power to new fuel pump?

1998 GMC SUBURBAN
250,000 MILES
Avatar
CROB80
  • MEMBER
  • 3 POSTS
I drove it to school, turned it off and when i tried to crank it an hour later all it would do was turn over. Didnt hear the fuel pump kick on so figured it was bad, bought a new one put it un and cant get power to it. Ive checked the relay and its good. Any suggestions please
Feb 25, 2012 at 5:11 PM
Advertisement
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Could be the computer controlled of the fuel pump relay-
Feb 25, 2012 at 5:26 PM
Avatar
CROB80
  • MEMBER
  • 3 POSTS
Changed the computer also and no change. Simeone said check the crank sensor but i dont know how many ohms it is supposed to read.
Feb 25, 2012 at 5:37 PM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Check ignition fuse E 10amp-see below
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Feb 25, 2012 at 5:48 PM
Avatar
CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
lets start by checking the fuel pump and the enjecter fuses.with a meter or test light.
Feb 25, 2012 at 5:59 PM
Avatar
CROB80
  • MEMBER
  • 3 POSTS
Im not getting power to the box under the hood that the relay plugs in to. Where does the power come from
Feb 26, 2012 at 9:25 AM
Avatar
CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
does the 10amp fuse ing e fuse show voltages with a test light or multi meter to check voltage its under the hood.if it has power on both sides of the fuse. pull the relay out their is a diagram on the side and check for power at pin 30 with the key on.start here
Feb 26, 2012 at 4:56 PM
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.