fuel gauge

[Robert J Hampton]

I have replaced the sending unit and it will only go in one way in my tank, so I know it is mounted properly, but it still reads it is half full when empty. any suggestions??

 

[Joe Ferguson]

The gauge on the dash must match the sending unit otherwise the reading will be erratic.

For example (if my memory is good) on a MF-135 gas the sending unit has 240 ohm resistance the gauge on the dash must be for a 240 ohms sender unit.

Sometimes the resistance value is printed on the gauge faceplate. If you want to know the sending unit resistance just connect an ohm meter between the connecton post on the sender and ground and move the arm in the tank with a clean "wooden stick" Do not use metal a spark can cause explosion.

One possibility is the tank is not properly grounded to the tractor to check that connect a wire to one screw holding the sending unit and the other end on a good ground on the tractor.

If you are not familar with electric measurements stated above ask someone who knows you are dealing with gas or fuel... spark or short circuit may cause explosion or fire.

My 2¢

Joe Ferguson

 

[Chip812]

When I replaced mine, I had to bend the float arm (slightly) to get it to read full... However, I'm not sure that is your problem... My tank is dented and the sensor sits on it crooked... However, bending [b:7513b4f6a8]IS[/b:7513b4f6a8] an option...

 

[TXMF135]

I bought a fuel gauge and sender on the same invoice so they would "match". They came from two different companies. I had a problem with the gauge not reading. I hooked it up dry and new to a jump box (12V DC) before installing these parts. I discovered that the arm puts the float to the left of the sender hole. My float was rubbing the tank wall at the rear of the tank. Took it out and moved the float to the other side of the wire and it works perfect now.