How can I clean a 5 gallon gas tank with old gas and sludge? [SOLVED]

Thanks for the question, Richard.

Yes, you can clean that out using a mixture of Sea Foam and fresh fuel. Sea Foam will help reliquefy the fuel gum/varnish/sludge and clean up the tank.

Here’s what I’d do:

• Mix Sea Foam Motor Treatment with fresh fuel at about a 50/50 ratio
• Pour the mixture into the tank and make sure it’s filled above the contamination line
• Let it sit for 24-48 hours
• Periodically move or slosh the tank to keep the mixture working

If you can, leave the tank in a warm area or direct sunlight. Sea Foam works better with heat and will clean faster.

Once you’re done, dispose of the Sea Foam/fuel mixture.