Good morning Charles, sorry for delay, my name is ***** ***** you for asking your question, I will try and help you out.
There are different fuel tank capacities available on this unit ranging from 30-50 gallon but most times in order to fix fuel gage issue you will need to drop tank anyway and its stamped on top of tank so we can kill two birds here. Yours is probably 35 gallons.
Most often the ground strap or wire from tank sending unit has a poor connection, or the float or sending unit is defective.
First you must remove fuel tank straps with a floor jack holding up tank with a block of wood on top of jack to support fuel tank weight,,start lowering tank enough to get wires and fuel line off,,once off lower tank to ground,,remove wire plug,,remove sending unit,there is a collar around sending unit you need to use hammer and chisal to turn locking ring 1/2 turn and sending until lifts out,
check plug for any corrosion, repair as needed,,then plug back in and work float up/down while someone is watching gage,,if gage does not move touch the float wire to ground and gage should peg full,,do this with key on,,if gage does not move you either have a gage issue or broken wire from sender to gage,,inspect wire loom.
Remove plug again and ohm out sender wire to ground while moving float to see if reading goes up/down,if it does not replace sender.
Also make sure flat does not have a hole and floats.
while tank is down check capacity stamped on top.
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