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`94 VFRF Fuel Pump Operation


Scotty750

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Hey wrenchers,

Another noob question.

Assuming the bike has not been run in awhile, should I be able to hear the fuel pump when I first turn the key to ON, before hitting the Start switch?

TIA!

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The fuel pump does not run continuously like a motor, it pulses and does so slowly at idle.  I have never noticed hearing my fuel pump run before I hit the start switch. 

 Looking at the wiring diagram, the fuel pump relay gets power from the ignition control module.  I am not sure if the relay is powered if the engine is not turning over.  Does someone know for sure?

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The fuel cut off relay make sure the pump only can run when engine is turning - the pump will not pulse (run) before you hit start. 
To test pump disconnect relay and short black blue wires (color from memory)

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Check the colors - short black with black/blue. ignition on.

Relay is located next to pump - has a 3 wire connector - last wire is red/yellow

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Thanks all, this is a huge help.

 

Shorted the relay wires, pump ran. No mistaking, it's pretty loud.

 

Now what tells the relay to turn the pump on&off? Some pressure sensor?

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