Fuel sending units

[Ontarionewport]

I'm having a hell of a time with my fuel gauge and sending unit. I had the fuel gauge repaired and it still doesn't work. I believe the gauge itself is fine but the sending unit is defective. I bought it from Rock auto. I have been told that vans auto has better sending units. Does anyone here have experience with these sending units/familiar with vans auto's units?

Thanks

 

[live4theking]

I put a van's unit in my car 8 years ago. I works, but is not overly accurate. I gauge goes pas full and at empty you have several gallons left.

 

[CBODY67]

What about the special clamp for the piece of fuel line between the sending unit and the fuel line the rubber connects to? The sender grounds though THAT FUEL LINE, so the clamp provides the circuit between the sender and the fuel line. If gone, that clamp might be replicated with a piece of wire or similar between the sender and the fuel line, possibly.

About the only time the C-body senders/gauges were really accurate was at "F", "middle", and maybe "1/4 left". Not uncommon for exact accuracy to be off a gallon or two here and there. A-bodies were noted for running out of gas at the 1/8th left area on the gauge.

Not hard to figure out your specific vehicle. When it gets to 1/4 left, put an amount equal to 1/2 tank in and see where the needle goes. When it gets to 1/2 tank, fill it up to where the nozzle clicks off, then note how much more when the next nozzle click happens. Let that be "total full", rather than "stick your finger in it in the filler neck" full.

Chrysler rated the non-wagon tanks at 25 gallons, but the replacement vendors say 23 gallons. Whatever works for your car.

CBODY67

 

[Ontarionewport]

Ok thanks. Maybe I'm expecting too much from the fuel gauge and sender. I'll fill it up tonight and keep that in mind. I guess I'm just used to modern cars. In all the time my father and I have owned the car the fuel gauge has never worked.

 

[Blusmbl]

If you ground the sending unit wire, the gauge should read full. You can also try measuring resistance on it at the tank, just stick a meter on it, it should be 70 ohms empty, and 10 ohms full.

 

[Just Carbs]

The float arm is too short on all the aftermarket Mopar sending units I get.
I adjust the float arm length and curve until the float hits the top and bottom of the tank. Then it reads full when it's full and empty when it's empty.
In between is where the float arm curve comes into play for accuracy.

 

[Ontarionewport]

Ok then. That makes sense. I put 50 CAD gas in the car and it's now registering about 1/8 so I guess it is working but not really accurately. It's probably a little less than half full with the gas that was already in it. I believe the tank is 91 liters.