onan 3 cyl generator '90wlsp36

[williamcharrison]

Help,
I just returned from an extended business trip and went to start
the generator on my bird (which was running fine when I left) and it
will start and immediately shut down. For the short time it runs it
blows lots of black smoke. The air cleaner is brand new and
unobstructed. I can keep it running by manually pulling back on the
lever attached to the stop solenoid. Other items noticed are the
oil pressure and temp gauges which appeared to be pegged (before I
tried to start it the first time).