Ms 251 fuel pressure

[isawben]

I recently acquired a Stihl ms 251, which had overheated. When I took off the fuel line, fuel spurted everywhere. There was an obvious build up of pressure, but what caused it? Could this have something to do with the overheating of the engine?

 

[DND 9000]

No, this is normal. The tank vent opens only on vaccum. Open the tank cap first to release pressure, before removing the fuel line.