Hi, fellow rotary enthusisasts. I finally got my fuel tanks and sump
tank installed in my SQ2000.   Today I was surfing the net,
and came upon an interesting firewall fuel filter that has provisions
for routing the unused fuel from the fuel rail/regulator
directly back into the fuel filter, and right back to the engine.
Their advertisement claims "Lite-weight aluminum construction,
provision for 3 bypass holders, eliminates return lines to tank, saves


5 pounds, simplifies plumbing and has an easy to service
washable screen filter" Here is their web site for those interested or

curious.

www.esslingeracing.com/new%20midget/fuel%20injection.htm   I would be
interested in hearing other opinions of this product. I
sent an e-mail to them today inquiring more about it, but as of yet
have not received a reply.  Thanks in advance for your
replies and opinions.  Paul Conner

It presumes having the pump(s) downstream from the filter.  Seems there
is some difference of opinion on that.  My opinion is that a coarse
filter (screen) and gascolator  upstream from the pump is OK, but I
think you'd want about 30 micron filter downstream where you don't risk
vapor lock if  the pressure drop across the filter starts to go up.
Also there is a concern about heating of the fuel.  Waiting in line for
takoff on a hot day and that small volume of fuel going round and round
. . maybe an issue.  I'm concerned about the increase in temp in my 3
gal sump tank.

Al

BTW Guys there is no return flow in the RX8 system. The immersed pump
has the pressure regulator according to Jim Mederer.

Paul Lamar

Paul,

       For what it's worth, I don't have a return system on my car
either. The ECU controls the pumps output pressure. Are these returnless
systems unusual?

Phil Williamson

What kind of car do you have Phil? I think it is the latest trend.
I specifically asked Jim Mederer if the ECU controlled the pump pressure
on the RX8 and he said no. He could be wrong as there is no real way
of knowing unless you hook a scope to the pump wire feeding electrical 
power to the pump. On the other hand Jim has considerable experience with 
the RX8 engine on his dyno. He tells me the pressure regulator is built into
the pump.

In theory all you really need is a electronic pulse width controlled pump 
for a constant dribble fuel injection system. No electronic injectors. 
No pressure regulator. Probably work fine for an aircraft engine. 
Less parts to fail.

Paul Lamar
 
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