Ok I have a 1988 f-150 with a 4.9 I6 and I had a small exaust leak that was where the cat and the two tubes that go from the exaust manifolds and it was welded on and now I have no fuel pressure and the pump doesn't kick on and it's a brand new pump and I can no longer pull codes from the computer with a jumper wire on the check engine light or a test light

 

Does your check engine light come on when you turn the key to RUN without starting the engine?

 

Yes and it stays on but when it turns on it fades in it doesn't just turn on like usual and i know for a fact it has one code for a neutral drive swicth but it ran fine before and it wouldnt turn the the check engine light on it would only come up when you tested it

 

The fuel pump doesn't come on at all when you turn they key on? Start checking your battery connections and grounds.

 

Every thing but the fuel pumps come on light wipers heater radio starter.

 

Start checking battery connections and grounds. I'd also try swapping around your relays and seeing if you can elicit any kind of change.

 

Will do ian

 

Ok its some where in between the repay and the two pumps

 

How about the inertia switch?

 

Its been reset and I tried to paper clip around neither of them worked

 

Have you checked ALL you grounds.

 

Taking the bed off tomorrow to check from the cab to the in tank pump .....by the way it's a single tank

 

That just cuts your work in half. Lol

 

Also the fuel relay has constant 12 volt power and the fuse are fine

 

Do you hear the fuel pump relay click on when you turn the key on? You may need a helper to turn the key for you.