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OEM Fuel pump wiring HELP!!!

Old 06-15-2010, 01:21 PM
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Default OEM Fuel pump wiring HELP!!!

Trying to make a 2003 Silverado 6.0 OEM fuel pump work on a motor swap/transplant. There are 2 connectors: 1 is a 3 pin connector with wire colors: GRAY-GREEN-BLACK....the other connector is a 4 pin connector: Orange/Black-GRAY-Black-Purple.
Don't want to burn the pump up. I just need to know which is power & ground...

TIA
Old 06-15-2010, 01:33 PM
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Does this help any?

Old 06-15-2010, 02:04 PM
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The connectors and pump dont look like that, Damn it might be a newer pump...
Attached Thumbnails OEM Fuel pump wiring HELP!!!-sspx8719.jpg   OEM Fuel pump wiring HELP!!!-sspx8720.jpg   OEM Fuel pump wiring HELP!!!-sspx8721.jpg  
Old 06-15-2010, 02:43 PM
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Gray and large Black are the fuel pump wires. Gray is power. Purple and Orange are for the fuel sending unit. The 3 way connector is for the in tank pressure sensor.
Old 06-15-2010, 03:14 PM
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Nothing happens when I connect 12V power to gray wire....
When I connect 12V power to gray & orange wire pump sounds like's it's on...
Old 06-15-2010, 03:16 PM
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I tried every combination & 12 volt power to Gray & Orange wire's sounds like pump is on or shorting out...
Old 06-15-2010, 06:06 PM
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What application is the pump for?
Old 06-15-2010, 06:56 PM
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I just found out that the fuel pump is from a 2004 Silverado 6.0 ...
I'm doing a conversion. 2004 Silverado rolling chassis with a 1985 Silverado body
Attached Thumbnails OEM Fuel pump wiring HELP!!!-sspx8722.jpg   OEM Fuel pump wiring HELP!!!-sspx8723.jpg   OEM Fuel pump wiring HELP!!!-sspx0395.jpg  
Old 06-16-2010, 01:23 PM
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Haven't been able to find out where Orange wire goes....
Old 06-16-2010, 02:13 PM
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Pull the pump out and trace the wires.

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