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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?
- 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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