NEED HELP!! haveing fuel prob with new EFI

[devdizz84]

i resently put a mustang 5.0 in my bronco, got the toms bronco harness, everything said and done go to fire it up. runs strong for about 3 or 4 seconds and dies. i know it is not a vaccume prob, cause i sprayd starting fluid in the intake while stating, and it runs fine till i let up. i put a new 23 gallon efi tank, new line and pump, so i know everything is clean, but i might have accidently got a chunk of rubber from the line in when i hooked it up. hoping the injectors arnt clogged. :-[ anyone had any prob like this or is it just that im retarded or somthing.

 

[Viperwolf1]

What's the fuel pressure when it dies? Does the fuel pump stop running before it dies? Any diagnostic codes?

 

[devdizz84]

i dont have a pressure tester at the moment. No codes, but when i turn the key on it primes and shuts off. at least i think its priming.

 

[devdizz84]

should the fuel pump stay running from the time i turn the key on?

 

[Viperwolf1]

When you turn the key to ON but don't start the engine the pump should run for about 2 seconds then quit. Once the engine is running the pump should continue to run.

You can test the pump and pump wiring circuit by grounding a self test connect pin. The green wire in this pic is controlled by the computer. It grounds the fuel pump relay coil in order to power the pump with the ignition switch ON. If you put a jumper between that connector and ground it should cause the pump to run continuously.

 

[HoosierDaddy]

DO NOT rely on the fact that your parts are NEW. My HP pump was bad from the box. Took a bit to chase that down.