I’m in the process of “rebuilding” mine right now. Temporarily I put on one of the $35 Chinese units and this has cured the tank pressure/de-pressuring issues.
I am ready to re-assemble the original unit and am wondering if it is really all that essential to get an airtight seal on the canister top? I have limited tools (hand/small electric) so welding is out of the question. I can do epoxy or RTV, but a full bead of either would make it pretty tough to get apart again.
The car has to go through the Colorado “front range” emissions test, so I’m counting on using the plastic cap to hide my work.
I would be grateful for any thoughts.