"AL_n" wrote:

. Even with the cap
loose, it still dies out immediately after it fires up.

If it dies out immediately, there's something blocking the carb...is this a
conventional bowl-type carb? If so, it ought to run for a few minutes just
on that fuel....if the tank and fuel line are OK (pull the line off the
carb and see if fuel runs out), a carb cleaning and/or overhaul is called
for. Often depending on the supplier, and new carb is cheaper.

Disclaimer:
I'm on the other side of the pond, and don't know Mountfield at all, but
I've dealt with a lot of small engines on various garden implements of
death and destruction.

--
Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic
Zone 5/4 in upstate New York, 1420' elevation. NY WO G