I just installed a new HP fuel pump on 86 B2 and it does not come on at all.
The old pump pumped a little gas at least, the new one, nothing!
The wires and fuel lines are tight. What should I check?

 

Do you have 12v at the FP, how about at the inertia switch.

 

well like ken said 12v at pump inertia switch in cab passenger side next to transmission hump little black box with a push button. next to heater core.

are you sure you didn't cross wires at the pump ? just a thought

 

I do not have power at the pump. I pushed the reset on the inertia switch, still nothing.
I dont know if the wires are reversed or not, the new pump was not labled + and -, and the terminals are not the same as the old one.
How did changing the pump kill the power?
Thanks

 

When I replaced the computer a year ago there was a post telling how to power the fuel pumps by jumpering some wires at the relay or something like that. I cant find the info by searching the forum. Does anyone know about this?
Its the only way I am going to get the new pump problem checked out.

 

You ground one of the leads to the self-test connector (short end). A Chiltons/Haynes manual should have diagrams.

 

Thank you mrshorty, thats exactly what I needed and it's running now!

I had to do that to test the pump since it isnt powered without the truck running. The leads were backwards because they arent like the original pump.
I dont know how anyone could repalce the pump and get the fuel system refilled without grounding the test lead to run the pump. Anyway,It works now! thanks

 

you see you crossed the wires simple things sometimes glad it worked out for you.