Fuel pump wont kick on - 1996 GMC Sierra

it's airlocking. when you're pulling the pump trigger to release the fuel, there's no space for the air to come out past it so it kicks back.
either you're using the wrong pump or the filler pipe is incorrect for the vehicle. Then again, some cars just weren't built right as I've had that happen.

relay? all drive belts on motor?

i dont believe there is a fuel cutoff switch on that yr but you might want to check the pump take it out and wire it straight to the battery for a few seconds if it doesnt kick on and stay on then return the fuel pump... if it kicks on and stays on then you might want to consider a new sending unit as well as the pump it doesnt cost that much more and then you wont have that worry later down the road

You need to change the fuel pump.

When you replaced the fuel pump did you replace the connector on top of the sending unit

try kicking your fuel tank and if your fuel pump is bad it may "kick start" so to speak your fuel pump, if nothin happens it may be the fuel pump, the lines may not have enough pressure, it may also be your filter just being a lil dirty and needing replaced

you should be able to find a fuse in the line that triggers the relay

Check to see if the fuel pump is kicking in,
when you turn the key on without starting the van you should hear it kick on for about 2 seconds,

It could be...
A clogged fuel filter...
Blown fuse for the pump..or bad pump relay..
No gas
Bad fuel pump