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Old 07-09-2011, 08:34 PM
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GM in-tank fuel Pump question

I have a 2004 GM truck in tank pump that I'm installing in my 59 Suburban Tank. I need to know what the various connectors are. I numbered them to make it easy.
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Old 07-09-2011, 09:27 PM
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1 vent hose

2 is fuel pump and ground and fuel level sender wires connector

gray is pump 12 volts + feed from relay under hood of truck
black is ground full time always
purple is output for fuel level signal wire to guage in dash
you will need to modify this to be zero to 90 ohms like the 50s truck is, either modify swap to an older resistor board on the module assembly, or modify the existing one so it only goes from zero to 90 ohms so it will work accurately with the 50s guage.
the fourth wire i forgot., what color is it or what does it connect to on the module assembly? or take a pic of it- out of the tank where this wire goes.
if not i can look on the 2001 silverado one i have from replacement we did on one the other day here in the shop.




3 is fuel tank pressure sensor, you wont need this, just iggy it.


4 is fuel line output to the fuel injector rail

5 is basic tank vent

are you sures its 2004? its interesting that its steel and not white plastic module assembly hmm... interesting.. most everything changed to plastic modules in the 1993 94 95 time frame. its the right size and connectors though.

Last edited by fast68; 07-09-2011 at 09:35 PM.
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Old 07-09-2011, 09:48 PM
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Yes sure it's a 2004 or maybe 2005. The engine and tranny I'm using are also 2004. You said 1 and 5 are vents. Which one is the return from the regulator?
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Old 07-09-2011, 10:01 PM
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5 is your return line

nice freaking panel in your avatar
post pics here 55-59-chevy-truck in this forum
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Old 07-09-2011, 10:57 PM
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Quote:
Originally Posted by ogre
5 is your return line

nice freaking panel in your avatar
post pics here 55-59-chevy-truck in this forum
Thanks! Actually it's a Suburban
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Old 07-15-2011, 07:37 AM
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[QUOTE=fast68]
you will need to modify this to be zero to 90 ohms like the 50s truck is, either modify swap to an older resistor board on the module assembly, or modify the existing one so it only goes from zero to 90 ohms so it will work accurately with the 50s guage.

Can you give me some more info on this? Is there someone here that has done it?
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Old 07-20-2011, 03:36 PM
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OK guys I'm almost ready to strap the tank in. I just can't figure out the extra black wire. The connector at the fuel pump has a grey (+12v) Purple (sending wire) black and black. Which black is the ground? What does the other black wire connect to?
So close!
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Old 07-21-2011, 08:33 AM
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Update

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 so it seems the wire to the gauge is working. 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.
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Old 07-21-2011, 08:57 PM
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You need to check what ohm range the sender has for full and empty.
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Old 07-24-2011, 08:07 PM
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What gauge are you using? I'm running SW Classic series gauges in my Diamond T project. I have the tank and in tank pump mount bracket from a '93 G20 van, with a GM replacement pump for an '02 pickup, which fit the vans mount perfectly. My truck has a 6.0 LS in it, hence I needed the 90 psi pump rather than the 15 psi throttle body pump that was in the tank. I used the sender that came with the SW gauge, as the Chev pickup sender doesn't work with the SW gauge (as the above posts infer, the Ohms don't add up!). The new sender won't work with you original gauge either, if that's what you're trying to do.

Brian
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Old 07-25-2011, 08:24 PM
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Quote:
Originally Posted by flynbrian48
What gauge are you using? I'm running SW Classic series gauges in my Diamond T project. I have the tank and in tank pump mount bracket from a '93 G20 van, with a GM replacement pump for an '02 pickup, which fit the vans mount perfectly. My truck has a 6.0 LS in it, hence I needed the 90 psi pump rather than the 15 psi throttle body pump that was in the tank. I used the sender that came with the SW gauge, as the Chev pickup sender doesn't work with the SW gauge (as the above posts infer, the Ohms don't add up!). The new sender won't work with you original gauge either, if that's what you're trying to do.

Brian
I'm using the factory gauge. It used to work with the old sending unit. Doc has a thread where he describes how to make the old gauge work with the newer 90 ohm senders. However, I'm not getting any response currently with the gauge wired up. Always points to full.
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