Question about 2005 Buick Rendezvous

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Hot at all times grey wire does not burn as bright as other hots at fuel pump wire harness

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  • 74 Answers

Hot wire shorted to grnd?...grnd wire shorted to a hot wire?

Posted on Nov 27, 2013

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6ya6ya
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Posted on Jan 02, 2017

  • 1596 Answers

SOURCE: replaced fuel pump, pump wiring harness, fuel

Fuel Pump RELAY & FUSE CHECKED & DO you Have POWER "TO" Fuel Pump ? ALSO OIL Sending Unit Supplys the GROUND To Fuel Pump , This is A Saftey FEATURE that Shuts Down Fuel If ENGINE Looses OIL PRESSURE . And If This OIL Sending Unit or also Called (OIL PRESSURE SENSOR) << If It FAILS it WILL Cause What Seems Like A Fue Pump Problem But Is Rally Just The Sensor that is BAD. HOPE this Sheds Light on Your Problem !

Posted on Sep 30, 2009

daves944
  • 1050 Answers

SOURCE: Buick Regal dying

You have a problem in the fuel pump relay circuit for sure then. I'm betting the relay, but it could be that dropping resistor.

Posted on May 11, 2009

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1 Answer

What color is the hot wire to the fuel pump on a 1986 Toyota pickup 4x4


Been a long time for this one. But all the ones I have done are grey for the hot wire.

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What could be the problem


Pull the pump out and see if just running 12 volts across it gets it to work. If that happens then it is not the pump at all but more likely fuse board or even the body computer.

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95 chevy blazer


The wires provided for a radio system are as follows:
yellow = hot with ignition key ON
orange = hot from BATT at all times
Grey = dimming power from instrument panel

Black = ground

Harness Wires provided for the speakers as follows:
Left rear speaker = +brown -yellow
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Right front door speaker and tweeter = +light green -grey
Note: connection colors at the speaker location differ as noted:
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All other speaker connections are consistent with their harness colors.

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1 Answer

No power to fuel pump intermittently when hot (summer). After waiting approximately 15 minutes, fuel pump will hum & engine will start when ignition is turned on.


Check the wiring between the fuel pump and the wiring harness, this sounds like a short or wire melting to something hot.

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Can anyone enlighten me on what the readings at the fuel pump connection should be for the three wires on the harness? From memory, I think the colors are purple, grey & black w/ white stripe? I was...


It should be four wires. Gray is power to the pump, Purple is gauge control, and two black wires that are ground. You should have battery voltage on the gray for 3 sec. after the key is turned on. Did you replace the plug-in to the pump when you replaced the pump? The pumps usually come with new plugs

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1 Answer

What wire is the power for the fuel pump at the pump


there were some production changes in 1998 to the fuel pump wiring, so the connector can have 2 diff fuel pump power wire colors, the most common color is grey, but the the harness at the tank has just 4 wires, the larger wires at the four wire oval connector are the fuel pump 12 Volt and the other is the ground, it is black, the other 2 wires are the sending unit, also the connectors ( Chevy factory service bulletin) on this year had a problem with burning, so if you get a new fuel pump always replace the 4 wire fuel pump connector. I have attreached a picture of the connector
2ea264c.jpg

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1 Answer

On my 1994 plymouth voyager the 3 wire harness to fuel pump (blue wire) doesn't have 12 volts; should it? fuel pump quit then worked once when hot-wired with 12 volts. fuse and relay is good.


The wire should not be hot until the relay is triggered. The relay does not get triggered until the ignition key is turned on. It will run for 3-5 seconds or until the system pressure it at max.

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1 Answer

93 merc topaz feul pump wiring harness question


The engine computer turns on the fuel pump for 3 seconds when you turn the key to "ON".
If the engine does not start, the pump will not run.
When you turn the key to "Start", the fuel pump runs all the time the key is held in start.
When you turn the key on, it actiavtes the power relay, which provides power to the PCM or engine computer.
The PCM then activates the fuel pump relay, sending power to the fuel pump.
You should have one wire with 12V for 3 seconds in "run" position. This comes from the fuel pump relay to the inertia switch in the trunk and then to the fuel pump.
You should have one ground wire. black
One wire going to the fuel guage.
You may have another ground iwre ging to a diode before going to ground.

Mar 30, 2009 | 1993 Mercury Topaz

2 Answers

1997 k1500 just quit and will not start


you should have power on the tan wire for about 5 seconds with key on try to cycle key on for 5 sec off for 10 sec if no power chehave power on both sides of fuseck ecm 1 10 amp fuse if you check ecm b fuse if that is ok check for power on the orange wire and power on the green with white wire on fuel pump relay if you have power on those check for power on the grey wire out to fuel pump if you have power on grey wire you have a bad wire from the grey to the tan wire some where in the harness hope this helps

Nov 16, 2008 | 1997 Chevrolet K1500

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