This might be a wild, outside chance... Has someone removed the
little flow restrictor between the vacuum pump and the shutoff
circuit? If somehow the shutdown is getting too much vacuum, it can
restrict RPM. THis does not explain the sudden "on" of the
situation, or why opening the fuel system cures it. But, it is easy
enough to pull the vacuum line off the shutoff and try that for 2K or
so. Plugged tank vent explains why the situation is ok after opening
the fuel system.
A less desirable possibility is the governor on the pump. I had one
on a 603 that would suddenly go slow. When restarted, it would be
ok, then go slow. In that situation, the governor deteriorated so
fast that within 30 min or so, the engine would fire a few times,
and the governor would slam the rack shut. So, the result was that
the engine would start normally, fire for a revolution or two and
then die.
I've noticed the "whoosh" when removing the filler cap pn one of the cars on
occasion, but now I couldn't tell you which one it was.
I haven't cleaned the tank out yet --
I don't see bubbles in the line - it doesn't act like a leaking line - it
acts like it's either starved for fuel or air.
On Tue, May 4, 2010 at 8:38 PM, John Reames <jwrea...@comcast.net> wrote:
Umm when you pull the cap off, does it come right off, or does it take some
force to actually *pull* the cap off? (possibly accompanied by anninrush of
air)?
If so, check the tank vent line...
When you cleaned the tank, what did the filter in the tank look like?
What's the flow through the lines themselves look like? Both at the body
lines and at the line into the fuel filter etc.
When it's running do you see any air bubbles in the Lin
--
OK Don
Panic! (the national past time).
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