Re:Fuel Pump Wiring Help
2012/07/29 19:38:27
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Matt,
If it were me I would take a fused power feed (10 amps) from your starter solenoid or battery to the power side of the relay( terninal 87 on a relay normally),and from the switched side of the power relay, terminal 30 to your fuel pump active, ground your fuel pump to the body work, that is the power circuit sorted. Now for the control circuit, take a ignition switched active to a ignition pulse controlled relay (used in LPG gas systems as a LPG solenoide safety cut off) then the output of this to termial 85 on your fuel pump relay. Ground terminal 86 of your relay the the body work. You will need a power feed to your LPG ignition relay, just use the fused power feed from your fuel relay and also a ground to the body of the ignition relay. Plus an ignition pulse input from your coil, normally the -ve side.
The reason for doing this is, if you have an accident without the fuel cut off provided by the LPG relay, the pump will keep pumping and if your fuel lines are cut, this is not a good thing for you or anyone trying to help you. When you go to start the car, turn your ignition key to on and your LPG relay will prime the fuel pump for up to 5 seconds or so if no pulse input is detected it will turn the pump relay off again. When you turn the key to start the relay will sence the pulse from the igniton and close the relay contact until you turn the car off, so if for any reason, say your engine stalls due to an accident or what ever your fuel pump will be turned off, a very good safety thing to have and at $35 or so even more so.
Scott
If only the wife left me, I would have the time to finish the car.