greybeard
Well-known member
I have two MS290s, one about 10 years old that I have used a lot and abused a good bit..the other about 4 yrs old but probably less than 5 total hrs on it. At different times, I've had the same problem with both. At high rpms, gas will spray out the fuel cap..not just leak, I mean spray! Just every once in a while. Changed that funky Stihl cap and the newer one still does it occasionally.. What's the cause...are those tanks supposed to be pressurized?