On Feb 15, 10:13 pm, "Mike" wrote:
relay it via the oil pressure switch or something similar so it only

feeds fuel if the crank is rotating.

Ok, I want to make sure you really understand this... it's important. The
fuel pump should only be working when the engine is cranking to *start*, OR
there is oil pressure. When you're cranking the engine to start it, there is
no oil pressure, but you need fuel. Once it's started, AND you have oil
pressure, the fuel pump works as well. The scenario you want to avoid is a
running engine, being fed fuel, with NO oil pressure.

James' advice is dead on. The pump needs to be wired to the cranking
terminal of the
starter *AND* (not OR) to an oil pressure switch.


better yet, On a Delco starter, That is, if it's a GM motor, the Delco
starter should have two small terminals on the solenoid switch. one
for "start" (S) and the other is "relay" (R) .
Instead of wiring the fuel pump to the (S) terminal as perscribed,
wire it to the (R) terminal which is an inner switch, that when the
starter is cranking it will provide a full 12v shot to your fuel
pump.

If you wire the pump to the (S) terminal, the voltage pull from the
pump itself, can rob you of power to the pull-in coil[s] in the
solenoid, giving weak solenoid performance, causing the starter not to
work properly.