Ls swap mustang fuel pressure issue

[lsmustang04]

Hello all, new to the forums. Finishing up my 6.0 swapped newedge mustang and im having a problem starting it. It builds as u cycle the key with pressure up to 31 psi. However, when I start it it starts and stalls and it slowly loses pressure and never builds back up again. Car has a holley terminator x ecu and im using the 340lph duetshworks fuel pump.

 

[Noobz347]

Moved to [Other Auto Tech]

I'm not sure why you would be asking these question here.

It's not a Mustang engine, fuel system, or ECU.

It's most likely an issue with your Terminator X installation, wiring, or setup.

 

[rednotch]

Hot wire the pump and make sure it holds pressure with no leaks before chasing other things, dont crank it.... I've used m18 batteries and efi pumps like that to transfer fuel from 55 gallon drums so not hard to do. Sloppy mechanics should have a couple old video's on boob tube.. Depending on injectors make sure there not leaking, seen lots of the Ls swaps get flooded out from cheapy China or decapped injectors, end up hydro locking it enough to bend stuff.