Fuel pump test

While testing main pump useing line to container at fuel rail, I had fuel come pouring out the return line, not from the fuel rail side. I also forgot to remove the fill cap,to reduce pressure. Does this suggest any kind of problem to any one. Car just died, while driving. Turns over but will not start, has compression.

Reply to
jacktheboy
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There should normally be a strong flow on the return side when the injectors are connected because the regulator is a shunt regulator; it dumps the excess fuel from the pump back into the tank to control the pressure. I don't know why you have no output on the rail side, though. If you are saying that with both open there is no rail output it sounds like a bad regulator... but in truth I've never tried that test. It just isn't the usual regulator failure mode. At least you know the fuel pump is working :-)

Also... have you ruled out the ignition system as the culprit? The easiest way is to fire a burst of starting fluid into the air cleaner box, closing it up and trying to start the engine. If it goes "vroom" and dies then you have confirmed it will run if the fuel is fixed.

Mike

Reply to
Michael Pardee

When my car did this it was the power stage in the ignition system that has failed. Have you checked for a spark?

Reply to
James Sweet

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