Having problems with your 2001 GMC W3500 ?
On the plug that goes into fuel pump . it has 4 wires a ,b .c.d shouldnt i be getting 12 volt from one of them?i only get 5 volt from one.fuel pump does not work
You should have 12 volts at the gray wire.The black is ground make sure and use this wire also.This way you know the ground is good also.When you turn the key on you will only get battery voltage for 2 seconds with the key on.If you crank the motor then you will get battery voltage also.Hope this helps.Good luck.
Repair Help & Product Troubleshooting for 2001 GMC W3500
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.