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Fuel Pump Relay/Kill

  • Thread starter Thread starter chriswh86
  • Start date Start date
C

chriswh86

Guest
Hello,

In my racecar when i bought it, it was wired up threw a relay so that the fuel pump wouldnt turn on if there was no oil pressure present. Or If a crash happened and the engine turns off the fuel pump would also.

So what im asking if for some wiring savvy person to help me get a diagram of how to rewire it. I have a 5 prong Bosch Relay on of those black aftermarket ones.

Im just not sure on what lead will go were and what signal the oil pressure sender, sends. So i belive the wires that will need to be used are the 12v to the fuel pump, oil pressure sender wire and a 12v source. In the cockpit of the car, i also have a push/pull kill switch that kills all 12v power.

Chris,
 
does anyone recall the oil pressure signal? if its a negative signal when there is pressure or?
 
chriswh86 said:
Hello,

In my racecar when i bought it, it was wired up threw a relay so that the fuel pump wouldnt turn on if there was no oil pressure present. Or If a crash happened and the engine turns off the fuel pump would also.

So what im asking if for some wiring savvy person to help me get a diagram of how to rewire it. I have a 5 prong Bosch Relay on of those black aftermarket ones.

Im just not sure on what lead will go were and what signal the oil pressure sender, sends. So i belive the wires that will need to be used are the 12v to the fuel pump, oil pressure sender wire and a 12v source. In the cockpit of the car, i also have a push/pull kill switch that kills all 12v power.

Chris,
Click to expand...

Hi Chris. Attached is a schematic diagram for a simple circuit to do what you're looking for, given the parts you have already (I assumed you had fuses). Click on it to enlarge. This will, however, give priority to low oil pressure shutdown. If the optional line shown is added, then priority is bypassed during engine cranking (use this if you find the engine sluggish to
start......it should not normally be needed with a carb engine though).
 
Last edited:
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