Just wasted an hour trying to type an analysis of my 10 year battle with fuel tank issues. Timed out so lost it prior to hitting the reply button. I believe the high design of the existing tanks are going to always cause a problem eventually due to dust, fuel residue, and other issues with the vent including the path of the vent tube. Nothing can get effectively higher than the filler tube opening and very little can get as high. Over time, the field canister charcoal, gas smell, and filling problems are going to recur. I saw a tank last night that I will use on my next FFR Hotrod. It is a 16 gallon tank, does not present clearance issues with the trunk hinges, allows a steep exit of the vent tube with a loop higher than the filler neck opening. Here is a tank I think would work well.

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