Pass Gas

[MoeMac]

Aloha What is the best way to clean the inside of a fuel tank. I have older C-27 with a Atomic 4. I dont know if the tank has ever been cleaned. The only opening in the tank is through the gas gauge.

 

[Bob Sawyer]

Cleaning Fuel Tank

Last year I purchased a 1974 C27. One of the problems I had with my A4 was that my carb was clogging with a white powder. I concluded that my tank needed to be cleaned. I drained and removed my fuel tank and put some new clean gas in it along with some gravel. I swished the gas and gravel around and drained it again. I added more gas swished it around and drained out the residue. I then left it out in the sun for a few days to dry. I think I did a pretty good job. I cleaned out the carb, reconnected the tank, and it started right up. However, after running the A4 for about two hours the problem reoccurred. This time I replaced the hose between the tank and carborator with an new SAE approved fuel hose($15) and inserted a Racor gas/water filter($60). Since then my A4 has been running perfectly. Accordinly, I would recommend that you replace the hose and add a filter before you go to the trouble of cleaning the tank. However, if you must, the gravel/gas method worked for me. Hope this helps,Bob

 

[Rob]

Sawyer's Right

Yep, I did the same thing, but I didn't have to remove the tank and put gravel in it. Water separating filter is your best shot - don't be without it. The A4 is not very tolerant of water (nor should it be).Watch how much time you spend below when doing this. I spent too much time below while draining the fuel and was not too clear-headed for about an hour afterward.Also, check out PRI fuel additive.