My boat has a vented cap, it has a small line running next to the fill hose, that connects in the cap assembly, but I still get a little leakage when it starts getting warm out. I think that is just from expansion.
Could that be the only issue?
Can you just not "top %$%$%$%$, leaving a little room for expansion?
Just a thought, personally I would not want to drill a hole in a gas tank.
But thats just me.
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