The Cessna 120-140 Association Forum

I noticed a stain on my interior at the rear door post. After opening up the interior panels and wing root fairing it looks like fuel has been seeping from the float type quantity indicator, anyone have any experience with this?....Thanks

John Sharkey 314 518 4818

...may be the gasket -- they get old & leak after a "few" years. Spruce has (below) and I believe John C. has indicated that local LPG dealers may have in stock. While relatively simple to R & R, it's important to mitigate risk of static or other fire hazards...and, of course, the fuel must be drained before removing. Mac

Thanks is there a video or instruction on rebuild that you know of ? My gauges are pretty awful is it best to repair or replace the floats while doing it, thanks for your help....John

BTW is there a rebuild kit?

There is a shop that does refurbs on them...I don't have it handy, but it may be Air Parts of Loch Haven(?). Maybe someone will confirm or advise. Some have reported removing the assembly & "re-shellacking" the floats, but that's likely only "legally" done by an authorized repair station. ...not aware of any rebuild kit. Mac

Aircraft Spruce sells two different neoprene floats. Not sure which one you need; match the size as best as you can.

It is Air Parts of Lock Haven that does the rebuilds. Depending on the version of your gauge, you have to be careful of the torque value or you will get cracking. I have older gauges that they restored and they did an excellent job and I used the gasket mentioned from Aircraft Spruce. My IA used the torque value from the newer Rochester gauges you can buy on AS and they are built differently and have a higher torque value. It introduced a couple of small cracks on mine that luckily did not result in a fuel leak.

The newer gauges allow for a torque range of 20-50 in-lbs with 1/4" screws and a Buna gasket.

The older original gauge, I was advised to not exceed 20 in-lbs. My IA had torqued to 40 and had to back it down to 20.

When you look at the 2 side by side, the newer ones are more beefed up and will withstand the higher torque values. I keep an eye on the couple of very small cracks on mine and after a year, they have been leak free. Once a gauge cracks to the point it leaks, the gasket won't help and they can't be repaired per Lockhaven, FYI.

Good luck

Not sure if this is of any interest to you or not....
https://www.ebay.ca/itm/303837819489?ul_noapp=true

Thanks for all your help I went to Spruce and looked for the gadget and can't seem to find it, do you guys have a part #? The ones in the pic don't seem to locate it.....Thanks Again

Look @ the Spruce site for "REPLACEMENT FUEL FLOAT FOR MECHANICAL FUEL GAUGE". I think their part # is 05-03395. They actually have two floats, so you may want to look at specs to compare with size of current cork. Mac