Question about 1965 Chevrolet Corvette

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Vr 355 stroker with extra fuel pump piggybacked off purple and black wires to original intank pump keep burning out the fuel relay switch melting the five pin socket. how do i wire a seperate fuel relay switch independant of each other?

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Why not just plug a separate wiring system into an empty accesory fuse at the fuse panel? Pick one that turns on and off with the key. Hope this helps.

Posted on May 08, 2010


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Hi I have a ldv 400 convoy 2002 bio fuel tipper crew cab my fuel pump electrics melted on the pump I could not find one any were so I made one and I tested it on a battery it works I put it on my truck...

You put power from the relay to the pump, it worked. That wire is good. The wire from the fuse to the relay is bad. Your going to have to look inside the fuse panel.

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Make sure the ground is good, that truck was known for a bad connector near the Trannie cross member. Find your plug at fuel pump,4 wires..2 black, gray and purple. Black and purple are for the float. Gray is power to pump, black with yellow is ground for pump. When key is turned grey wire gets power check good ground . If power and grounds are good replace pump if not fix ground or replace relay

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Fuel pump wire color

The gray wire goes from the pump relay to the pump. The black white wire is the ground for the pump. The purple is for the gauge on the dash and the black is ground for the sending unit. I don't list a white wire being used.
If the colors on the truck don't match the tank, you'll have to test them to verify each circuit.

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Here is what I have from my diagram - -
the wire from the fuel gauge on the dash to the sending unit in the tank is purple. Not the pump.
The wire from the pump to the pump relay is gray.
The wire from the relay to the 10amp fuse is purple.
The wire from the relay to the computer is orange.
The wire from the relay used to power the pump to prime it is red.
And the ground wire for the relay is black-white.

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If it is the correct fuel pump - where it unplugged, it should just plug in where the old one did.

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Light comes on showing rear defogger is on both fuses are good the one inside hood and fuse box all wiring is connected I am missing something else that its not working could button be bad?

Hi, I finally solved mine after about 3 years without it! Firstly, there is a connection under the carpet near the driver's feet. This connector connects 6 or so wires. The important one is the PURPLE wire that connects to BLACK. This connection burns out and melts the plastic connector, usually causing a short or potentially a fire! I just cleaned up the connector so that nothing was touching (no contacts touching eachother) and spliced the PURPLE and BLACK wire directly with some heavier gauge wire than whats used in the car.

NOW, i figured that part out 2 years ago and was still in the same situation. Finally got around to ripping the dash apart and taking out the hvac unit (where you control your temperature etc.)... In behind that unit is the very same PURPLE wire (opposite end of it) that has also burned and corroded in the connector. I disconnected the entire hvac unit, pried out the black plastic thing that contains the built in relay and defog switch, again used heavier gauge wire wrapped to the melted connector and fed that wire out with hvac bulb wires and spliced the other end to mr.PURPLE . Sealed everything up and to my elation, NO MORE FROST ON THE REAR WINDOW. Hope this helps someone.

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1 Answer

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

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.

Nov 18, 2009 | 2001 GMC Sierra 2500HD

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Where is the fuel pump relay on a 2002 nissan sentra 1.8

The fuel pump relay is behind the kick panel on the drivers side. The wire colors coming out of the relay should be Black w/ Red stripe, Black w/ White stripe, Black w/ Yellow stripe and Black w/ Purple stripe.

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the fuel pump relay is up under the drivers pedals right hand side white relay, only thing is it wont be the relay thats at fault, it will either be the intank fuel pump/sender, or a loose terminal on the connector on the pump/sender under the black square panel under the rear seat base, under carpet, unfortunately it all comes as one unit. {worked for kings volvo dealer for 13 years} ade.

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