Fuel Sender Gasket
 

My sender gasket is leaking on the right (copilot) side wing for the second time in two years (at least my shop thinks it is the gasket). It appears to be a "cork like" gasket. Anybody know if this is the correct type or if there are other options? Are they supposed to be fuel proof? I would simply like to know for certain that the correct and best gasket is getting installed this time because this is growing tiresome.

Thanks, Ed

The gaskets I just puchased from Yingling Aviation were more of a rubber type material. Used the number from the PC it is S1588-1 $23.53 each.

When you say, "fuel sender" are you talking about the fuel selector valve that's inside the wing? Or are you talking about something else?

Thanks Herb....I will look into that part.

The area I am talking about I do not believe has anything to do with a fuel selector. On top of my inboard most fuel tank (between the boom and fuselage) there is an electronic type device with several wires which I believe sends info to the signal conditioner and ultimately to the fuel gauges. This device is secured with 6 screws and has a gasket between the device and the top of the tank. It is this gasket in question.

Thanks for the help.

Ed

I think you want an S350, which is a standard/stock aerospace part (see figure below).

Ernie

Thanks for explaining it to me. But what is part number S1588-1 for? Is that the gasket for the fuel selector valve in the wing? The parts manual doesn't break the wing fuel selector valve down any further than the full assembly -- at least for a 67' model. That's why I'm asking if S1588-1 is for that selector valve. Thanks for any additional info someone can offer about the wing fuel selector valve gasket part number.

The gasket is for the liquidometer, or fuel quantity sender.

This is not for the fuel selector valve--different part of the wing.

Guess it depends on the model. Here is from my PC
Part #31

Yes, Ed, it does depend on the model. Since I know yours is a '73, the picture in my message is from the parts manual for a '73.

Ernie

Thanks you guys....my shop only had the "cork" like gasket in stock and being that my plane has been down for six weeks, I was done waiting for parts. They installed the gasket with some sort of little rubber type washers around the six screws I mentioned so I will keep my fingers crossed that it does not leak. I guess my shop felt the leak was through the holes for the screws as opposed to the gasket itself so we'll see. My plane is back in my hanger as of today so hopefully I will get a chance to fly this weekend or early next week.

Thanks Ed

So, does anyone know the part number for gasket in the fuel selector valve in the wing?

I looked for the gasket in the fuel selector valve in the wing. You can see the gasket in the illustration, but there is no part number, so it must not be available separately. Notice that some of the other parts come only in an Airborne kit.

Ernie

I see the same thing, why does Cessna do that. Has anyone ever rebuilt one of these selector valves with an airborne kit...and has the gasket part number handle?

Fuel Selector Valve
 

The number is listed in the O-2 Illustrated Parts Manual, it is B3-12-1. I looks like it has six screw holes plus the large hole in the center.

Thanks, that's some good info. Why would the military get that kind of info but not the civilian? Now to find a supplier for it. The usual suppliers don't list it. Any ideas who might have them?

Bummer
 

These are non-procurable parts. Cessna has no availability of these parts. They offer overhauled units for $2,861. If it was just the cork gasket I needed I went to the local auto parts store bought a roll of the fel-pro gasket material of the same thickness and proceeded to rely on my first grade arts and craft days to pattern and cut out new gaskets. I’ve seen other mechanics seal them with pro-seal or B2 but I was always leery about the sealant getting into the selector. I opted for making new gaskets.

(from a friend in the aircraft parts business)

Thanks, make cork gaskets...got it.

Just to follow up this thread. How is the fel-pro gasket holding up? Any leaks yet or was it like fel-pro was made for 100LL?

Ed

Just replaced one of mine. Original was cork as was replacement. My old one had shrunk enough that the screws could be turned by hand. Only the safety wire was holding them in. The original gasket lasted 38 years.