Plastic Fuel Tank Leak from Sending Unit

[donvanv]

I had to remove the sending unit from Beneteau 36cc which has a plastic fuel tank. The reason for removal is irrelevant at this point, but after replacing the gasket and reinstalling the unit it has leaked ever time I filled up the tank. Is there a special gasket? Or perhaps a sealant that can be used to seal this tank back up? Being a plastic tank, I can not torque the screws very hard as it would simply strip out the holes. Here is a photo of sending unit with wire connectors removed and the top plate next to the unit.

 

[NYSail]

I am following this as I worry about same thing. I had to remove the sending unit a few times and always worry about the seal as like you said can’t really over tighten the screws. So far so good...... however I worry when filling. I would almost think on these tanks there would be something like butyl tape.... obviously would have to be made to withstand fuel.....

Greg

 

[Gunni]

That is a one-use compression gasket, you need to replace it, not reuse it. Don’t goop it up with anything either.

 

[NYSail]

Wonder where one would get replacement gaskets....... get the sender model and call manufacturer or I assume one could be made using a basic fuel friendly gasket material from an auto store....

Greg

 

[donvanv]

Yes, I did replace with a new gasket from NAPA auto parts, not a OEM part. Perhaps the original was more of a soft, thicker material?

 

[donvanv]

After reinstalling I applied Permatex Ultra Black around the outside of base. It did seal the around the outside of base, and think that did not leak. I believe the fuel was actually coming up around the screws. So, I am going to get a new dry gasket and apply a small amount to gasket and screw threads prior to screwing down.

Wonder where one would get replacement gaskets....... get the sender model and call manufacturer or I assume one could be made using a basic fuel friendly gasket material from an auto store....

Greg

Dealer has not been very helpful. Will try again today with phone call. He has referred me to a boat yard in the area who also is not been helpful.