David,

Does yours have a vacuum controlled fuel pressure regulator?  It could be
that the diaphragm leaks fuel into the intake manifold through the
attached vacuum line.

Mike <mjcatlin@dcn.davis.ca.us>
88 GL
82 diesel

On Sat, 3 May 1997, David L. Chasteen wrote:

> I know that this thread is probably gone far enough, but I still don't
> seem to be able to isolate the problem completely.  Here's a recap to
> date:
> 
> a couple of weeks ago when I was driving home from work, the engine on
> my 82 westy suddenly started running very rough, smoking and would die
> if I took my foot off the gas.  I checked my temp sensors, no problem
> there. I checked all the fuel injector connections, everything seems to
> be OK there also.  I cleaned the inside of the AFM and the butterfly
> valve seems to be moving freely. No O2 sensor is part of the system,
> apparently not part of the 82 aircooled system.  Gas still seems to be
> getting into the oil.  OK, here's the wierd part...  When the key is on,
> I can hear and feel gas running through the fuel lines, apparently going
> into the pistons.  When I disconnect the AFM, the fuel stops running. 
> It will idle fine with the AFM disconnected, but of course will not
> drive that way.  I have pretty much decided that the AFM is bad (has an
> intermittant problem, since it only does it after driving a while 5-10
> minutes) and I need to replace it.  Does anyone have any experience with
> this?  Do you think I'm on the right track?  Thanks!
> Chaz & "Peewee"
>