2004 fuel pump wiring question
Thread Starter
On The Tree
Joined: Nov 2005
Posts: 102
Likes: 0
2004 fuel pump wiring question I'm adding an in-tank pump to my conversion. I have a pump from a 2004 Silverado with 6 liter. The connector has a grey, purple, and two black wires. I know the purple is the sending wire for fuel level. The grey is probably +12 v but not sure about the two black wires. One is the pump ground but I need to know for sure before I strap this tank in. Anyone have a diagram for this connector?
Thanks!
Thanks!
Take the pump out of the tank and trace the wires.
If you smoke it may be a good time to stop for a bit while doing this. I don't want your 15 minutes of fame to be an obituary on the evening news.
If you smoke it may be a good time to stop for a bit while doing this. I don't want your 15 minutes of fame to be an obituary on the evening news.
Thread Starter
On The Tree
Joined: Nov 2005
Posts: 102
Likes: 0
REEEEAAAALLLY don't want to take the pump out. Took a while to get it in the tank. I retrofitted the original tank to hold this pump and it's tedious to remove.
Thread Starter
On The Tree
Joined: Nov 2005
Posts: 102
Likes: 0
I have the pump hooked up. The wires are loomed in pairs from the factory harness. The grey wire is paired with a black and the purple wire is paired with a black. I hooked the grey and black wires up using the black wire on the outside of the connector. When I turn on the ignition the pump runs two seconds then stops. So I'm assuming this is correct.
However when I plug the purple wire up and the black wire paired with it, the gas gauge never moves off full. If I ground the purple wire the gauge moves to empty. I tried running the black wire from the connector to the chassis and no change. I'm guessing the sending unit may be bad. It's from a 2004 truck.
However when I plug the purple wire up and the black wire paired with it, the gas gauge never moves off full. If I ground the purple wire the gauge moves to empty. I tried running the black wire from the connector to the chassis and no change. I'm guessing the sending unit may be bad. It's from a 2004 truck.
Did you figure this out? I am trying to wire up my fuel cell and just need to know which two wires for the fuel level sender. I dont think it matters which wire is hooked up to which since the level is read in accross the two.
Not sure how much GM has changed since '96, but my S-truck fuel module has the same 4 wires. Gray + Black (ground) is the pump circuit, Purple + Black (ground) is the fuel level sender.
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Staging Lane
Joined: Mar 2002
Posts: 74
Likes: 3
From: Perry Hall, MD USA
Fuel level sensor is just a variable resistor. So if by "Voltage Dependent" you mean Positive 12v, NO, Here is GM's Description...
"The fuel level sensor changes resistance in response to fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The PCM sends the fuel level percentage via the class 2 serial data circuit to the instrument cluster in order to control the fuel gauge. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics."
"The fuel level sensor changes resistance in response to fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The PCM sends the fuel level percentage via the class 2 serial data circuit to the instrument cluster in order to control the fuel gauge. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics."
Last edited by 02NavyBlueZ; Aug 5, 2011 at 06:18 PM.
Staging Lane
Joined: Mar 2002
Posts: 74
Likes: 3
From: Perry Hall, MD USA
Also note that anytime your installing a gauge with a sender its always best to use the SAME ground reference for the Gauge and Sender otherwise you may get innacurate readings. So you may have to run the ground from the sender back up to where the gauge gets grounded in order to get a proper/accurate reading.
