The Fuel Pump?
if its the fuel pump then the black wire is fuel pump ground and the purple wire is fuel level sensor signal and the gray wire is fuel pump power and the orange is fuel level sensor reference wire
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SOURCE: the new connector for the fuel pump 99 Chevy
One wire will be a common ground. Depending on how much fuel you have in the tank you should receive a voltage from about 5 to 9 volts from the common ground to the fuel gauge - the other is the live to the Fuel Pump, typically - your 4 wire situation may be two grounds - one to each - put a fuse 10amp fuse in-line or disconnect the pigtail from tank and test for voltages and Zero resistance which would be the same as if you put both probes from your tester together and the meter shows "1" - if there is a problem or resistance then the reading will be "0" or the resistance value. Be sure to use low Ohms setting or you may not get any reading.
This is of course - general info, from which should lead you to the answer you seek.
Good luck.
East Coast Canada Rocks!!!
:)
Good luck.
There may be a ground that just connects to the tank itself - you can test for Ohms with a meter to determine if these are ground wires or must be determined. Can check between negative to battery to
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