Sep 21, 2015, 01:49 PM
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What color to wire powers fuel pump?
CF Veteran
Joined: Jan 2009
Posts: 1,964
Likes: 6
From: Baltimore, Maryland
Year: 1994 1993
Model: Cherokee
Engine: 4.0
OK, it's 2017, but there are STILL some of us who have older (ancient) Jeeps.
I just recently took my 1994 GC Limited out of storage and am trying to get everything
healthy again. So yes, while it was a hot topic back in the 1990s, there are those of us
who are still actively looking for how to diagnose and fix fuel tank senders.
So for those who answer old posts-- even years later-- THANK YOU.
I just recently took my 1994 GC Limited out of storage and am trying to get everything
healthy again. So yes, while it was a hot topic back in the 1990s, there are those of us
who are still actively looking for how to diagnose and fix fuel tank senders.
So for those who answer old posts-- even years later-- THANK YOU.
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Does your 94 have the pump mounted on the front of the tank? I'm having issues with the gauge in mine and may have figured it out. Years ago changing the pump I didn't know about this below, hence my float might be hanging up on something. (this pic is in my sig btw)
Below is the inside of the tank. The black ring you see is the end of the cone that belongs on the end of the fuel return line on the pump assembly. That cone on the metal line holds the bottom of the whole deal in place. That should be fished out, and installed on the metal fuel return line on the assembly. Then you seat the cone into the receptacle in the tank when installing it. The fuel return and pickup are located in a tray inside the tank, so return fuel is available to be picked up at the pump inlet, even when the tank is low or at an angle. This "tray" has a downside now with alcohol in the fuel. Add just a little water, the ethanol separates from the fuel, it's heavier, and will be on the bottom. Without sloshing around, you could be recirculating a mess of alcohol and water. Might run ****ie, might not.
Below is the inside of the tank. The black ring you see is the end of the cone that belongs on the end of the fuel return line on the pump assembly. That cone on the metal line holds the bottom of the whole deal in place. That should be fished out, and installed on the metal fuel return line on the assembly. Then you seat the cone into the receptacle in the tank when installing it. The fuel return and pickup are located in a tray inside the tank, so return fuel is available to be picked up at the pump inlet, even when the tank is low or at an angle. This "tray" has a downside now with alcohol in the fuel. Add just a little water, the ethanol separates from the fuel, it's heavier, and will be on the bottom. Without sloshing around, you could be recirculating a mess of alcohol and water. Might run ****ie, might not.
Junior Member
Joined: Jun 2021
Posts: 51
Likes: 12
Model: Cherokee (XJ)
Color of fuel guage wires
Looking at a diagram for 4.0 engine there are 5 wires going to the fuel pump module.
1. Relay output to fuel pump module Dk Grn/Red (This is the power)
2. Sensor Ground PCM to module Blk/Lt Blu
3. Fuel Level to Instrument Cluster Dk Blu
4. Low Fuel to PCM low fuel sense Dk Blu/Wht
5. Ground Blk
1. Relay output to fuel pump module Dk Grn/Red (This is the power)
2. Sensor Ground PCM to module Blk/Lt Blu
3. Fuel Level to Instrument Cluster Dk Blu
4. Low Fuel to PCM low fuel sense Dk Blu/Wht
5. Ground Blk
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