Any body running an engine notice that or is it just
my RV4? Also the mixture is rapidly varying which of course
could be caused by the rapidly changing fuel
pressure. My pressure regulator is referenced to intake
manifold pressure. Is everybody doing that?

It is so bad I can't believe the engine runs.
Now that I have learned to steer the RV I can focus
on what is going on with the engine :)

Paul Lamar

Paul,
First try pulling the manifold pressure hose from the regulator (then
plug the hose of course)
and run the engine (monitor the fuel pressure in cockpit for
result)..........

Kelly Troyer
*"DYKE DELTA JD2" (Eventually)*
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo

If I pull the hose the tuning will be way off. The engine may
not start run. Worth a try however. I'll just clamp it off
with a large paper clip.

Paul Lamar

Hi   Paul,
try putting a very small restrictor in the line to
the manifold, to reduce the pulsations.     John Burey


Regarding my note about the regulator diaphragm probably being SS; I
remembered today when I worked at a VW dealer. The mechanical fuel injection
with the air flapper mass air would not run worth crap if it had gotten
water
in it. The diaphragm would rust up and a new one had to be put in. Looked
like
SS but obviously was not.

Dale Davies

The only fuel pressure regulators I have ever used all have silicone
diaphragms, although the ball that actually restricts flow is
typically stainless.

-Chris W