Fuel pump wont shut off??

HISSIN50 · Apr 18, 2008

evan9r said:
Does the fuel pump build up pressure and then shut off? Or does it just cycle on then off no matter the pressure?

The priming feature is a function of time. The EEC actually has no clue what your fuel pressure is at. So to answer your question, the latter statement is the most true.

evan9r · Apr 18, 2008

Should I have fuel pressure if the pump is off? If I leave the pump running I have pressure but once the key is off, there is none.

HISSIN50 · Apr 18, 2008

evan9r said:
Should I have fuel pressure if the pump is off? If I leave the pump running I have pressure but once the key is off, there is none.

Not necessarily. Generally these cars hold pressure for a little while after being shut off but not always. For instance, some aftermarket FPR's bleed pressure down almost immediately. A bad check valve in the tank can cause pressure to bleed off quickly as well.

evan9r · Apr 21, 2008

Well I figured it out finally. I have a superchip and I dont know if its computer specific or if it got fried along with the A9L but I took it out and the fuel pump worked fine. It cranked and idled fine like before. Runs ok but no power. Dont know why I didnt think of this sooner. I guess now Im looking at a reburn for the superchip or going with a SCT multiprogram or TwEECer. Any ideas?

Fuel pump wont shut off??

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