Most 85 and up Ford products use a inertia switch. In trucks it is under the
dash on a kick panel, cars have it located in the trunk. They seem to come
in two flavors, round red button and rectangular white button.
I can't tell you how many Fords had been towed into my shop for a no start.
" We went shopping, came out and the car would not start" A quick reset and
they are on their way.
I've experimented on old junkers and a hit with a rubber mallet on the rear
fender well will make one trip.
GM/Chrysler and most others use a engine computer controlled relay in
parallel with a oil pressure switch.
VW Rabbit, Golf and others use a RPM sensing fuel pump relay ( the fuse for
the pump is located on top of the relay)
I'd tend to use a oil pressure switch for simplicity and reliability sake.
Ignition power turns on a relay, power then flows to the oil pressure switch
then out to the pump. Adding a crank bypass to run the pump would be a good
idea, but I like to have a engine crank over a while to build oil pressure
before
it starts.
Harold
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