77 FI Gurus!! Have ?

[TBK1]

Is There a commonality between the Injectors firing and the electric fuel pump

I have to help Son's friend tommorrow, his fuel pump quit getting power so I jumped it out and it is fine, but at the same time it appears the injectors are not firing, have pressure but not starting, can induce starting fluid and starts right up then dies!

Any thing that controls both, not sure if the ecu controls anything on the fuel pump!

[zbane]

Not for a 77, but might still provide a couple starting points (no pun intended).

[76Datsun280z]

Have you checked the fuel injection relay? Place your hand on it, turn the key to "start" and you should hear a click.

[ktm]

"Any thing that controls both, not sure if the ecu controls anything on the fuel pump!"

Only to turn it on and let it run for 5 seconds (at least per the 1978 FSM) if the car does not start. Otherwise is simply turns the pump on. The pressure is controlled by the fuel pressure regulator and the injectors control the metering of the fuel.

[sblake01]

Austen is on to something there. A bad injection realay can prevent both the injectors and the fuel pump from working since the power for both run through it.

[TBK1]

Great tip guys, that is the relay under the drivers side dash, correct!

[sblake01]

That's the one.

[TBK1]

well if the little $^!# every gets it towed over here, ill let you know what I find, good thing with have restored acouple of these is I have SPARESSSSSSSSSS!!!!!!!!!

[sblake01]

Here's the test procedure for that relay. If it checks out okay check the ignition relay in the passenger side bracket since it feeds the fuel injection relay.