Fuel pump not working

[tnicholls]

Hi everyone my fuel pump is not priming or running on my m50. just put the motor back in from a rebuild. I have changed the ecu, fuel pump relay and checked grounds and I'm at a loss. The fuel pump kicks on if you bridge the relay with a piece of wire. any ideas?

[Sea Aych]

Are you sure the relay isn't busted? Swap in a new one.

[tnicholls]

tried that and switching ecus and nothing

[greybeard]

try testing your crank position sensor. I was having the same problem and it turned out to be a bad sensor. and buy oem if yours doesn't test as good.

[george graves]

Swap relays. See if it's bad. And like greybeard said, I'd trust a used CPS over an ebay one.

[tnicholls]

new cam sensor on the way hopefully thats it I've tested everything else.

[tnicholls]

So I tried new relay, new ecu, and new cam position sensor. Also confirmed the wire to the ecu for relay ground is good. Im not really sure what else it could be. When i jump the relay the pump runs strong.
edit: Installing crank sensor tomorrow

[tnicholls]

Installed crank sensor and it didn't make a difference. full pump still won't prime and car won't idle i need to hold the gas or the car will die

[george graves]

Silly question/....but you've double checked to make sure the lines aren't mixed up? I'm scratching my head here.

[tnicholls]

yes i checked the flow from the fuel pump when i jumped the relay. The pump still wont prime. I pulled the intake manifold to check for shorts in the wiring but i dont know what else to check, fingers crossed i find something grounding out.

[King Mufasa]

Did you figure out the issue?