The Boating Forum - diesel tank cover sealer

I have a small leak on the access cover on the top of on of the diesel tanks of my boat.What is the best sealer to use that will last to seal the cover? The last go around only lasted a couple of years and now shes a leaker!

Material?

I would suggest using a gasket material such as Consaco or other petroleum suitable material for the gasket and use a permatex sealant on both sides of the gasket.

Material?

Fiberglass!

We have found that cork / buna-n composite gaskets tend to be the most reliable for diesel fuel applications, as well as low-ethanol gasoline applications (10% or less ethanol). We have used this material for years, on thousands of tanks, with very few issues. We stock cork / buna-n sheets in 3/16" thickness, here at the shop, and I can get various other thicknesses (1/8", 1/4", or 3/8") . We also make gaskets from Hypalon and Viton, for more corrosive or lower-permeation applications.

Use with sealer or just bare gasket?

Take the cover off, clean it up, take it to your local Goodyear Rubber and tell them your are dealing with diesel and you need the correct gasket material.

The position of the tank cover makes it extremely difficult to remove completely.However,I can access it enough to allow me to clean it well and add sealer.
Someone suggested to me Permatex moto seal.Has anybody had experience with this product or any others for this given situation?

Help....anybody?

I have had good results with methods listed above. Not with sealer.Diffuculy is one thing but can it be done?