12 volts direct to fuel pump relay plug,no fuel pump hum
 

Have you considered that the new fuel pump may be defective?

thinking about going back to the fuel pump pigtail close to the tank and run test wire straight to the battery and see if fuel pump runs.then i'll know it is in the wiring.

If the new pump cost less than 150.00, I would suspect it.

What was the original problem that made you change the fuel pump ?

no start sometimes,fuel pump works some time ,sometime not,cuts off, no fuel pump hum,come back later,fuel pump hum and it starts.

So same problem now..

yes same ol problem.

So.. probably not the pump. Have you troubleshot the wiring ?

yes as best as i could,i have power to my fuel pump relay plug,also power to my fuel cut off switch,and both fuel and ecm relays are clicking on and off with the switch.inertia switch has power to green and yellow wire when switch is on.Also i jumpered inertia switch and no sound of fuel pump.

Dash switch ?
Even if you have a single tank, some still have the plug for a switch with a factory jumper that plugs in in place of a switch.
Check a wiring diagram and see where the power goes after the inertia switch.

the original problem was it was not holding pressure. After running the truck the pressure would drop straight to zero after turning it off. Even when it was on, it only was at about 30 psi and 28 is the lowest in the recommended amount. The new fuel pump runs at about 38 and holds pressure.

Did you change usernames?Key-off pressure is irrelevant.I've driven on ~12psi (as it was running out of gas).

Fuel pump