Mercury 240 EFI M2 wont run

[lynnboy021]

i installed a new powerhead and it wont run so i got the computer rebuild cuz they said i had 3 drivers bad in the efi... got the rebuild efi back and my injecters still wont fire so i removed injecters and bench test them and they work, also my fuel pump works... i am really stuck with the motor i have spark but just no injecters.... please help thanks...

 

[Dr Honda]

That engine has 3 fuel pumps. What one did you test?

Also... did you check to see if the injector drivers are OK. Just put a meter on the injector wires, and crank it.

 

[lynnboy021]

3 pumps i thought only had 2??? well all 2 pumps work (dont know where 3 is to test) and the injecters work cuz i test them but someone said it could be the control box on top of the motor???

 

[igneous]

The high pressure pump is in the vapor separator tank and it could be your problem. Did you check it? There's a test valve on top of tank, or just remove the hose and hold it in a large container while a helper cranks it. Should have ~34 psi if I remember correctly. Those pumps are $$ (I paid $400), but maybe someone can chime in with a better parts source.

 

[lynnboy021]

i know that pump works cuz i test it but i dont know the psi on it yet

 

[Dr Honda]

i know that pump works cuz i test it but i dont know the psi on it yet

Then you didn't test it.

Just because it makes noise... doesn't mean you are making any pressure.

 

[lynnboy021]

Then you didn't test it.

Just because it makes noise... doesn't mean you are making any pressure.

i removed the injecters with the pump and all and i hooked up 12 volts to the pump and 9 volts to the injecters. when i apply 9 volts the injecters open and gas came out, so yes the pump is working now does it have 40 psi idk but still fuel pumps is not my problem i dont think. i left the injecters out of the motor and i cranked the motor and i dont feel the injecters clicking......... efi and injecters work but whatever tells the efi to fire the injecters is not......