Good luck on calibration, I have a FSM (factory service manual) for my 86 RC and it does not have a single word of what is really going on to calibrate your 35 gallon sender/pick-up, other than making sure you have like 12 ohms when the pick-up is to the top and 78 ohms when at the bottom. (little tabs on the side of the resistor to help get right on with the ohms, this sets the E at the empty needle mark, and the F for the full fuel mark) All the rest (bending of the float arm for the proper reserve at tank empty "E" on the gauge) is by word of mouth, and who ever tells you how, its all kind of the same but some what different. My dealer ship told me, that you have to take a set of extension wires to the sender, with the tank on the ground and level. Then add 8 gallons of gas, now put the sender back in and out, bending the senders float wire just so, to get the gauge to point right on to the "E" of the gauge. This is all a bunch of crap, but because you have to do it with out breaking the float off of the wire, not bend a kink into the pick up tube at the same time. My first sender I broke of the float. (at $110.00) and the second was just as bad a PITA to calibrate.Adam D said:yeah I believe that the gasket on the sending unit has gone bad. but I'm not positive on that. What does in take to calibrate one of those things?
yeah i discovered this when i first got my rc. my grommet was split in 2 and everytime i would fill up it would spray fuel everywhere, i ended up having to get a sealer plug and sealing it shut, however, now i can't fill my tank all of the way due to the air in the top of the tank having nowhere to go. i have 3 other tanks with the valve i need to drop my tank and replace that part, just havent gotten to it yetAdam D said:. they nolonger can get that little rubber grommet for the rollover valve so I will be forced to use my old one on the new valve, It looks to be in pretty good shape so I hope I don't have a problem.
Adam, this is on your 76 TD? Just curious...the gasket that split is it a cork gasket with 5 holes in it?Adam D said:Well I dropped the tank,took about an hour, the gasket for the sending unit was split. The arm on the sending unit had a little piece of like cassette tape tape ,only thinner, wrapped around it and the fuel pick up so I think that is why my guage was reading wrong and have decided not to pay the $120 for a new unit.
Yeah that valve is called a rollover valve. I know because I broke the nipple off trying to disconnect the hose. so when I went to the dealer they said I can't get the gasket for the sender w/o the sender, so now I have to make my own. and they nolonger can get that little rubber grommet for the rollover valve so I will be forced to use my old one on the new valve, It looks to be in pretty good shape so I hope I don't have a problem.