Paul,
I've been following this thread closely, and wanted to add just a couple of
things.  I'm not sure exactly how you fuel system is configured, but on my
Cozy, I have two fuel pumps, mounted low (lower than the fuel tanks) on the
firewall, and they each feed a separate fuel filter, which then tee into the
regulator.  I use a 3 port regulator, so my fuel return is from the
regulator, and a short feed, of about 18" to the fuel rail.   All my lines
are AN6 or 3/8".

I have taken off with coolant over 200, on a 90 degree day, and that was
also back when I had marginal cooling.  I never had any issues with fuel
flow or vapor lock.  God knows I've had almost everything else though.

My fuel pumps and filters are mounted on the firewall, and the heat exiting
from the radiators and oil cooler is aft of the firewall by about 8-10
inches, so I don't think (guess) that the pumps are getting very much heat.

It's really hard to say what your problem was, but one thing I was wondering
about, is how you are doing your tuning?  I use an O2 sensor to a LED bar
display to aid with the tuning.  That way I know whether I'm running lean or
rich at a given MAP setting.  I know that you had an issue early on with low
RPM/power, and corrected it by going richer on the controller.  I just
wonder if you may not still be a little too lean, especially at the upper
end.

I agree with the others, that it may be too soon to just scrap what you've
built, and go a different direction.  I'm sure that you'll work through it.

Regards,
Steve Brooks

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