Greasecar WVO waste vegetable oil kit headaches cont'd

So I took a look into the greasecar waste vegetable oil tank the other day. The tank is the 15 gallon rectangular small vehicle (not the large truck) style. It has a top access panel that attaches with 10 bolts/screws to the main body of the tank. The part that you lift off holds the WVO level float, and the removable panel came with a CORK seal.

Now when I removed this access panel on the top of the tank to look in and inspect the heat exchanger and such, THE SEAL WAS GONE! That's right. GONE! I knew that cork was not a good material to use with vegetable oil, but the entire thing had desintegrated into thin air in only 6 months! The access panel has never had a really oil-tight seal--it has always leaked a little bit, but now I understand why...the access panel (aluminum) is resting against the aluminum of the tank body with no seal in between! What a crappy design! I mean really! you'd think that Greasecar, who boasts on their website that they are the leading wvo kit manufacturer, doesn't even include a seal that will withstand the chemical properties of WVO and the heat produced by their own heat exchanger!

So anyway, while in the tank, I tightened the compression fitting around the pex fuel line, which was VERY LOOSE. I very well may have been contaminating my coolant system with vegetable oil and vice-versa!

Greasecar sure has a nice reputation, but the more I learn about the details of their kit design, the more I realize that there are numerous things that (to say the least) should be improved.