Oil & Fuel l2250 fuel gauge help

vaskeet · Dec 28, 2006

I need help troubleshooting the fuel gauge on a l2250. How do I check the sending unit in the tank and what should it read (ohms?) thanks Randy

George2615 · Dec 28, 2006

Most fuel gauges send a voltage through the gauge to the sending unit. The sending unit works with a wiper arm that varies with resistance to ground. If you take the wire off the sender and short the wire to ground the gauge should read full. If it doesn't, there may be a short or open in the wire from the gauge. If it does the gauge is probably good. If you can pull the sender out of the tank then attach an ohmmeter one side to the stud the wire came off of, the other to the metal or second stud then swing the float from one end to the other. The ohm reading should be smooth from one end of the meter to the other. If not the wire wound resistor the float arm varies may be bad. It may be tough to check the sender resistance while still in the tank unless you can raise and lower the float arm through the filler neck.

vaskeet · Dec 28, 2006

Thanks for the info I think it is a bad sending unit in the tank. shorted gauge slowly rises (did not wait long enough for it to get to full). when I got the tractor all the gauges were bad and I got a used replacement inst cluster from a salvage yard. I installed it and all gauges except fuel were working. I really enjoy the tractor and I am trying to fix it up it is in rough shape but runs like a champ randy

ozzie tractor · Jan 1, 2007

George2615 said:
Most fuel gauges send a voltage through the gauge to the sending unit. The sending unit works with a wiper arm that varies with resistance to ground. If you take the wire off the sender and short the wire to ground the gauge should read full. If it doesn't, there may be a short or open in the wire from the gauge. If it does the gauge is probably good. If you can pull the sender out of the tank then attach an ohmmeter one side to the stud the wire came off of, the other to the metal or second stud then swing the float from one end to the other. The ohm reading should be smooth from one end of the meter to the other. If not the wire wound resistor the float arm varies may be bad. It may be tough to check the sender resistance while still in the tank unless you can raise and lower the float arm through the filler neck.

with a bit of wire you can usually hook the float arm and check it in tank.