When i turn off truck, (stock truck), fuel pump keeps running, even with key out. i pulled every relay and fuse that said 'fuel pump' in the underhood box, but still does not stop running. when i pull the hi/lo relay, it quiets down, but still is running. i finally had to pull the main distribution box 50A relay to cut power to everything to get it to stop.

Any ideas ? ignition switch maybe ?

thanks,
Dave
2001L

 

never mind. found my problem. 2 pinched/exposed wires inside harness above brake booster (don't know how it happened). one wire supplied power to interior stuff, and was always hot. other was post relay to pumps. they touched and supplied power to fuel pump. respliced and resealed. all ok

dave

 

WOW, that was a weird one, glad you got it figured out

 

Way to go Dave. Good logic in your trouble shooting.
Hope I do as well when my number comes up