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Question for fuel sending unit experts


Evan

Well-Known Member
Joined
Aug 11, 2007
Messages
1,373
City
Stevens Point, WI
Vehicle Year
1991
Transmission
Manual
I recently purchased and installed a 20 gallon aluminum fuel cell. It came with a 0-90 ohm sending unit. I connected the two fuel gauge wires to the two leads on the tank sending unit. When topped off, the gauge reads a totally empty tank, which means 0 ohms of resistance between the two poles. The tank is about half full now, and the needle is still on E; it hasn't moved. It I disconnect one of the wires the gauge goes up past full.

Has anyone had experience with connecting "foreign" fuel sending units to stock RBV gauges? What do I need to do to get this to work?
 
the stock gauge reads relative to ground.

How would I hook that up? There were 4 wires in the harness total. 2 obviously powered the pump, so that left me with two wires that I assumed were for the gauge. And there are two leads on the sending unit. The resistance between those changes as the level changes. So do I need to ground one of the leads?
 
Did you reverse the two wires you are using going to the sending unit?
The new tank is metal so the sending unit will ground thru the tank to frame more than likely. You can use your meter to see if the tank is grounded. If so, find the hot wire from the gauge and put it on the terminal that makes the gauge read. I don't know if 90 ohms is enough, but it should give you some kind of reading.:)shady
 
yeah it should ground through the tank, I had to add a direct ground on my bronco, when I upgraded to a single pump and plastic tank. I thought I would toss it out there, incase he is using rubber on the straps, and points where it touches the body/frame.
 
I messed around with it this afternoon, and can't get it to work.

There are two terminals on the sending unit. A center post and another terminal on the side which looks to be grounded to the tank. I verified the tank is grounded.

Right now I have the "positive" from the fuel gauge attached to the center post on the sending unit. And the other lead from the gauge is grounded. The gauge is dead on E, with a full tank. If I disconnect either lead, the gauge goes to F, even if it's empty.

Here's what my sending unit looks like:

rci-2161aFUELCELL.jpg
 

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