Paul Lamar:

On a rotary it is not a good idea to let the raw fuel drain
into the intake as it could cause hard starting and seal
sticking. It is an absolute no no in an RX8 engine as it
is guaranteed it won't start regardless if the apex seals
stick or not.

Would this post-shutdown fuel seepage problem be solved by having the
fuel pumps on their own pullable circuit breaker, and having a shutdown
procedure that involves pulling that breaker while at idle?  This would
permit the fuel rail pressure to be relieved at shutdown, making the
injectors less likely to seep.  It's also very reminiscent of how
Lycosaurs are shutdown; is that good or bad? :-)

Russell Kent

Hi, Russell...unfortunately, I tried that . I did it at idle, at 2000
rpm's and at 4000 rpm's.  Still leaked.  I also installed seperate
switches for the two high pressure fuel pumps, and killed the engine by
shutting off the fuel pumps. You could hear the engine go lean, then quit.
About 10 seconds later, the fuel drip started.  My suspicion is that even
though I shut off the fuel, there was still enough fuel coating the
insides of the long intake tubes (which ran downhill), and slowly pooled
at the throttlebody and got past the butterfly plate. I also tried just
turning off the ignition (coils) no noticeable difference.   Paul Conner

Yep that is what happens. Particularly if the engine is cold.

Paul Lamar
 
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