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Indeed there is a groove for an O-ring on the cap - thank you!

thanks for that will keep in mind - I just removed and inspected the sensor and rubber gasket on mine again - currently tightens down just fine so at the moment all is good there. Although I do not like the way water pools in that depression around the sensor opening -- I am about to fill tank...

I'm quite sure its original to the boat - so yes it is most likely the perko combo with vent -- and I will indeed look for an O-ring groove and install one asap. I am slightly perplexed on how the vent works since the cap appears not to have a vent hole - unless its where you put the deck key...

Can someone clear up the O ring question in the type of fill fitting that I have ? I went down to look at the cap and it is the screw cap with the knurled edge almost like on a classic car. There is a rubber type gasket on the fitting that the cap screws down upon. I went over to another Grady...

3 psi ? Good to know I would have gone quite a bit more if you hadn’t mentioned that Tnx! andrew 93 - when I replaced the sender and gasket I did examine those embedded nuts and all seemed ok but see they will be a problem eventually. I seem to be getting a good seal at this point and all the...

Interesting point re condensation. Tank was empty all winter because I was using portable tanks last summer. so it’s very possible recent water is from condensation. I Cannot get ethanol free fuel in NY - at least here on Long Island i do think I will attempt to pressurize tank from the fuel...

yes that is next step i will remove sender and get every drop out. i am also thinking of using a sealant instead of the rubber gasket for the sender.

Yes that is correct knurled cap I will replace o ring just pumped out remaining 2 - 3 gallons appears mostly clean so most water came out in the first 1/2 gallon pumped yesterday

Yes it is the original poly tank and there is a slight depression in the poly surrounding the sender. there is no O ring on the cap it is not at deck level but above and I am pumping water through the fuel line that feeds the motor. I put four gallons in this season as a test but will remove all...

This problem just doesn’t want to go away . I have changed the seal on the gauge sensor, replaced all the deck plates, checked all hose connections , fill is above deck so water leak seems unlikely. vent is integral to fill fitting but don’t see how water could enter that either. Water does...