i dont think the pump is runing to i trun the key off

 

to test if the LP is running,start the engine and open the water in fuel drain valve.

If the engine stalls the LP is not pumping enough fuel-if it keeps runng it is working fine.

 

no fuel is coming out of it all until i shut the truck off, pull the fuel pump relay, hook a jumper up, and then fuel comes out of the water drain valve fast, good flow. then if i start the truck with the jumper already hooked up, and the lift pump running fuel stops , not even a drop comes out of the water drain valve at all. and the lift pumps still pumps but no fuel. its driving me crazy !

 

Sounds more like you have a restriction problem than a non working LP problem.

Sock in the fuel tank plugged?
Vent in the filler cap plugged?
last ditch screen in the filter manager plugged?
Fuel filter plugged,less likely but a concern anyway?

 

i have checked the ditch screen i dont know how to check anything else or where it is

 

fuel filler cap is obvious.
in tank sock is in the tank on the end of the sending unit.

If an aftermarket sending unit has recently been installed it is a likely culprit-the sending units are being shipped with the wrong sock and have caused a lot of problems-replace with the original sock or remove sock completely and add an inline screen between the tank and LP.

 

ok im going to pull the bed when its do snowing here and ill let you how that gos i thnk t is the tank sock

 

It's a whole lot easier IMO to just drop the tank with use a of a floor jack

 

Actually the removing the bed while a bit tougher is better for preserving the fuel lines and eliminates the weight of the tank-first thing people usually do with a fuel problem is fill the tank.

 

Especially if you have access to a two post lift. Block the truck tires good and lift the box only. The bed will line back up perfect doing it this way.