To block back EMF on any coil such as a fuel pump winding use any good
sized regular diode from Radio Shack etc. Make the diode good for
a few hundred mils in forward current flow. Then solder the diode in
at either the fuel pump or at the switch. Just remember to connect the
cathode to the positive side and the anode to the negative side.
Otherwise the diode will burn out as soon as the power is restored.
So now any EMF pulse will break down the reverse voltage of the diode and
short it out thus saving the contacts on your switch.
Mark deHaas
dehaasm@napc-1.navy.mil
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