fuel system cleaner

[Bill Kycia]

Anyone know a good fuel system cleaner? My k-20 is running kind of crappy this spring,and would like to add something to the fuel (which is new)to clean carb etc. Someone said Mechcanic in a bottle works well.  Bill in CT.

[Blake Malkamaki]

I have had good luck with Sea Foam.

[ObsoElitist]

Same here. As a mechanic I am in contempt of most miracle snake oils, but this one was made to clean fuel system on boats laid up for winter, and it works.

[biggurn]

Sea Foam, every time I use it, I am amazed that it actually works! On one engine it worked so well (it cleaned all the carbon off the valves) I had to do a valve job!