Is it possible to use too much Sea Foam Motor Treatment in fuel? [SOLVED]

Is it possible to use too much Sea Foam in the gas tank ? And how long will it last in fuel?  I have a 1993 Suburban with a 42 gallon tank. I don’t drive it much and fill it maybe 2-3 times a year. And when I do I add 2 cans of Sea Foam.

I also have a 2006 Chevy van with a 31 gallon tank that I drive even less. The tanks hasn’t been filled for over a year. Last time with 2 cans Sea Foam. The van also has a built-in generator. Comes in handy for power outages. The tank was getting low (several multi day outages) and I did not want to drive, so I took 10 gallons of treated gas from the Suburban and dumped it into the van along with 2 cans Sea Foam. Is this enough, too much? How long will the gas last? Sounds like a problem on a quiz show.


Been using Sea Foam for a long time!

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Jim D.
Jim D.
2 years ago

That’s a great bundle of questions John. The quick answer is that you can add A LOT of Sea Foam to fuel, and you’re nowhere near being excessive. No worries!

As far as how long it lasts (to keep fuel fresh), you can expect it to help for up to two years. Even so, it’s a better idea to not go more than a year. Anyway, based on how you described your Suburban and van usage, everything you’re doing makes sense!

11 months ago

Can I put to much in my boat tank?

Conner Kranz
11 months ago
Reply to  Jerry

Hi Jerry – you don’t need to worry about adding too much. In fact, adding a lot of Sea Foam to a low amount of fuel in your boat is a great way to clean it. Try adding a full can to 2-3 gallons of fuel and run it to almost empty before refueling.

Technically speaking, it’s possible to run a 50/50 ratio of Sea Foam to fuel (but no need to go that strong!).

Hope that helps!