Thread: fox fuel pump
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Old 03-22-2007, 10:08 AM
stevethefolkie stevethefolkie is offline
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The easiest way I know to kill a fuel pump is to drive around with less than 1/4 of a tank of gas most of the time - the fuel cools the pumps - less fuel = less cooling - shorter life.

You need to deterimine a number of things (this is rather redundant - I'm pretty sure I responded to another of your posts)

1) is the fuel pump working? It should come on when you first turn the ignition key and then cut out until you start to get an igntion signal (meaning the engine is running) back from the hall sensor - you can jumper the fuel pump relay OR run a secondary power supply directly to the fuel pump to see if its working - if you do the secondary power supply be careful about sparks ... if the fuel pump isn't working then replace it - the car is - after all - pretty old. Things do wear out.

2) If the fuel pump seems to be working - take a pressure reading on the fuel line right before the fuel distributor - if the car won't start then obviously you'll have to either jumper the FPrelay OR run the secondary power supply to the pump - again - watch sparks

3) if you've got pressure at the distributor - and the car won't start - check for flow at the injectors - if it does start but then craps out when you un-jumper the FPRelay or take off the power supply to the pump -
then change the relay for a new or known - good used one - if that doesn't fix it then suspect a lack of signal from the HAL sensor indicating that the engine is running.
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