garretthes

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!

gofastwclass

iTrader: (2)

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.

garretthes

I only smoke when I'm on fire.
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.

garretthes

Wow, I have searched the web for hours and there is very little info on this. Seems the 4th wire might be a low reference for the fuel sending unit. Wondering what to do with it.

garretthes

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.

black04

iTrader: (14)

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.

S10xGN

iTrader: (11)

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.

Pocket

iTrader: (22)

If I were to guess, thats where Id put my money

02NavyBlueZ

I Believe this is what your looking for!

black04

iTrader: (14)

Does anyone know if the fuel level sensor is voltage dependent? Both wires inside of the tank are purple so i am guessing no?

02NavyBlueZ

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."

02NavyBlueZ

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.

BARDO1400

What’s the purpose of number 1?

02NavyBlueZ

What do you mean propose of #1?

G Atsma

It comes before number 2...