Fuel Pump

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[edit] No Sound from Fuel Pump

[edit] Pump Power

The fuel pump only runs while the engine is turning, (ignition pulses from Hall sensor in distributor) or the starter is cranking. The +12 volt is switched by the relay. The relay is controlled by the ECU. The 12 volt to the pump is also the 12 volt to the injectors. The injectors are controlled by the ECU completing the path to chassis (Dennis Haynes).


[edit] Troubleshooting Ideas

  • Bad Relay? In the engine compartment, driver's sidewall is a black case with yellow warning stickers. Lift the lid and you'll find two identical relays. The one on the right (closest to vehicle centre) is the fuel pump relay. Swap the two relays and try starting again. If the pump runs, it is the relay (Don Spence).
  • Debris in the pump? Disconnect it from the van's electrical (both hot and chassis) and apply power in the reverse sense so it would run backwards. Jim Akiba  had a pump that seemingly wouldn't run at all work again after doing this. Presumably there was something caught in the pump and stalling it, spinning the other way kicked it back, and voila, good enough to go on.
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