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- 15.
I installed a new oil pressure safety switch and fuel pump, and I'm not sure if I wired it up correctly! Should the fuel pump be running before the engine is actually being cranked, as mine does? - Top
- There is a wiring diagram in our electric fuel pump kits, but the hookup is quite simple to explain:
Power comes from the positive terminal of the coil and connects to one side of the “normally open” oil safety switch. There should be a 5 to 10 amp fuse in this line. The fuel pump connects to the other side of the safety switch from the coil lead, meaning that the pump should only run after the oil safety switch closes -- normally as oil pressure increases to above 10 or 15 PSI.
For late model engines, our kits (as well as original Universal systems) also include a connection from the fuel pump side of the safety switch to the “R” terminal of the starter solenoid to provide power while the starter is actually cranking the engine when starting. If your pump starts to run as soon as you turn your ignition switch on, check for the following:
1) You may have somehow connected the lead from the coil directly to the pump lead.
2) You might have inadvertently gotten a “normally closed” safety switch. Also, some safety switches (although not in out kits) have two sets of terminals: one “normally closed” and one “normally open.” If this is your case, you'll have to sort out which set is normally closed, and use them.
3) If you have the lead connected between the “R” terminal of the starter and the pump lead on the safety switch, check the “R” terminal. We have found a few to be shorted internally so as to be hot at all times. - Updated:
November 4, 2003
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