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2000 3500HD 6.5

Anyone have the diagram for a 2000,
20200728_191442.jpg
6.5, 3500HD (straight axle) with dual tanks. I am in the middle of my build and am eliminating the fuel balance module and everything else beyond the front lift pump and sender. The stock wire harness goes to the balance module and then forward and backwards to both the lift pumps.

My repair manual and the ones I found here do not address the dual lift pump and balance module as far a I could find.

My project is under the build section, but just really want to know what these wires are for each. These are the wires that go to the balance module, then some change colors when the go to either a LP or senders.

Big pink, little pink, purple, gray and black with white stripe.

Any help would be greatly appreciated.

cb1
 

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Well, that looks great. Thank you, thank you, thank you. I will take that to the shop this afternoon and see what I can see.

Thanks again,

cb1
 

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I guess I can't save or print the image, so I'll have to write it down and go to the shop. LOL.

cb1
 

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I guess I can't save or print the image, so I'll have to write it down and go to the shop. LOL.

cb1
Try putting your cursor on the image and right click. Choose "Save image" and place it in your desktop and then you can print it from there
 

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Try this PDF.
 

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I have a similar truck. What I did was cut the three wires that run the fuel gauge and each tank sender. I extended all those to a single pole double throw switch. This was the you can select what tank the gauge is reading from.

The other mod was to run power to a relay that switches the transfer pump on. I left the harness stock and ran a new set of wires for power and added the lift pump plug.

The only cutting was to the fuel sender wires. It works well and can be converted back easily.

The front tank is slightly bigger than the rear. I run the front near empty and let the transfer pump run empty the rear tank into the front. I monitor the situation with the gauge.
 

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Discussion Starter #9
I have a similar truck. What I did was cut the three wires that run the fuel gauge and each tank sender. I extended all those to a single pole double throw switch. This was the you can select what tank the gauge is reading from.

The other mod was to run power to a relay that switches the transfer pump on. I left the harness stock and ran a new set of wires for power and added the lift pump plug.

The only cutting was to the fuel sender wires. It works well and can be converted back easily.

The front tank is slightly bigger than the rear. I run the front near empty and let the transfer pump run empty the rear tank into the front. I monitor the situation with the gauge.
Sorry I was confusing. Tried to keep it short and did not mention that I was eliminating the second tank also. Just one tank. You can see it in my build post. It's not mounted yet, but going up against the cab when the brackets come back from the powdercoater.

cb1
 

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Got it all together and the truck is a runner again. The only issue is the sender wrong and I will have to get another one. Full when empty, E when full.

Anyone know the ohms for a stock 2000 3500HD fuel gauge.

cb1
 

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From the FSM "The fuel gauge should indicate empty at 0 ohms and full at 90 ohms"
Pretty much standard for all the 6.5 diesels.
That is a strange problem!
 

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From the FSM "The fuel gauge should indicate empty at 0 ohms and full at 90 ohms"
Pretty much standard for all the 6.5 diesels.
That is a strange problem!
The sender in stock Western Star semi-truck. I did read somewhere where it could be one way or the other depending on application. Everyone has to do their own thing. LOL..

Thanks for the ohm's answer.

cb1
 

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Just so you know what happened. I have approximately 10-15 gallons in the tank. Sender unhooked-gauge reads past full. Sender hooked up gauge reads 3/4's tank. And you can watch it move backwards.

cb1
 
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