Question about 2001 GMC Sierra 2500HD

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2001 gmc hd 2500 has 4 wires to fuel pump,,orange purple grey and black what is each for

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Hello tsundw.
Gray(positive from relay) and black (ground) are for fuel pump.
Purple and Orange are for your fuel level gauge.
That is a diagram for the gasoline engine.
Hope this helps you solve your problem.

Posted on Nov 18, 2009

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