fuel guage

[tinman58]

Don't ask me how I know but my fuel guage does not work.
What is the best way to test it? I have a new sending unit and a new wiring harness, the guage was in a box with a bunch of other junk TR3A 1958
Dan

 

[NutmegCT]

I've used these pages for two years whenever I need to test/calibrate my TR3 fuel gauge. Give it a try - let us know how it goes.

For all intents and purposes, it's the same gauge.

https://www.mgaguru.com/mgtech/electric/fg_10.htm

Tom

 

[TR3driver]

For a simple test, connect 12v to the gauge (between the B terminal and the case). With the tank (T) terminal open, it should read past full. If you short the tank terminal to the case/ground, it should read empty.

For more than that, check out
https://mgaguru.com/mgtech/electric/fg_01.htm
Although the resistance values are not precisely correct, they are close enough.

 

[Geo Hahn]

If you suspect the sending unit you can manipulate it with a length of wire suitably shaped to fish thru the gas cap opening and hook the arm of the sender. If the hook part is a big 'L' it can also be used to push the arm down. I use copper wire and make it long enough I'm not going to lose it in the tank if I let go.