How much Sea Foam should I put per gallon of gas for lawn mower and weed eater equipment [SOLVED]

Thanks for the question!

It depends on what you’re trying to do. Here are a few good guidelines for small engines like a lawn mower or weed eater:

For regular use/preventative maintenance:

• Add 2 ounces of Sea Foam per gallon of fuel.
  This helps keep the carburetor and fuel system clean and prevents gum and varnish from forming.

For cleaning (which is one of the best ways to use a can of Sea Foam):

Use a higher concentration. Here’s what I’d do:

• Add a strong mix (up to about a 1:2 ratio of Sea Foam to fuel)
• Run the engine for a few minutes to pull the treated fuel into the carburetor
• Shut it off and let it sit overnigh
• Run it again the next day

The high concentration works better and faster to clean out varnish, which is the #1 cause of rough running in small engines.

For storage:

• Add 2 ounces per gallon before storing.
  This helps stabilize the fuel and prevents gum and varnish from forming while it sits.

No need to be exact with measurements. Sea Foam is petroleum-based and safe to use in higher concentrations.