Will Sea Foam work right away to fix a rough running engine? [SOLVED]

Hi Theodore,

Thanks for the question! Sea Foam works to clean fuel resides and deposits. If that’s what is causing the rough running, it will work to help clear things up as the treated fuel is running through the system. It won’t work “immediately,” but it should clear up within one tank of gas if that’s the problem. If a dirty fuel system isn’t the problem, it won’t help the rough running, but you’ve narrowed down the potential problem and eliminated that one as a potential cause.

Here’s what I’d do: I like to wait until the tank is low (1/4 -1/8 tank), add the whole 16 oz can, and then drive for at least 10-20 miles before refueling. It’s safe to add a high concentration like that and it works very well for cleaning fuel residues and deposits. Add it to fuel like this every 3,000 miles or once a year.

If you’re talking about a small engine, use a similar process: add a 1:2 ratio of Sea Foam to gas (such as 8 oz of Sea Foam in 16 oz of fresh gas), and run through the tank of treated fuel.

Hope that helps and let me know if you have any other questions!