QI have a 1991 two-stroke outboard with a carburetor. It was running poorly so I tried replacing the fuel filter. That didn’t help so my mechanic pulled the carburetor and found the bowl full of a clear gel. My mechanic though it might be caused by some reaction in the fuel but wasn’t sure, then tried to soak it in Sea Foam…That didn’t work so he ended up brushing it out. Do you have any ideas what caused the gelling in the carburetor? Would using Sea Foam prevent the problem?
AWhat you discovered is what can happen when ethanol is used in older carburetors. The gel substance in the carburetor is the corrosive reaction between carburetor parts made from aluminum (alloy, pot metal), ethyl alcohol, water and electricity. The gel dries quick to leave a white powdery crust of corroded aluminum. Aluminum corrosion is typically found in carburetors that pre-date ethanol gasolines coming on the scene (2003 or older engines is a common rule of thumb). Remember that Sea Foam in fuel is always working as a fuel system lubricant and to treat carburetors, intakes and cylinder cavities (Sea Foam Spray) with when storing seasonal engines. And, avoid leaving ethanol in a fuel system.
QMy car is a 2005 Honda Civic 1.7L with 320,000 miles and it runs very well with Sea Foam. I am wondering about how Sea Foam mixes with my gas and when is the best time to pour it in my tank? Do I have to wait or drive around to mix it up?
ASea Foam Motor Treatment is made from petroleum, just like gasoline, diesel and motor oils. When added to petroleum fuel, Sea Foam’s ingredients immediately disburse evenly into the total volume of gas in the tank. As far was the best time to add, you can add when the tank is low or when it’s full. Just know that the more Sea Foam you add to a low amount of fuel, the greater the cleaning concentration. A lot of people like to add a full can or two when the tank is low, drive 20 to 50 miles, then add more fuel.