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

David Leonard wrote:

Paul, we go round and round on this issue on the list, and everyone
agrees that it is best to route all the way back to some sort of tank -
mostly to keep the fuel cool.

A guy near here just flew a RV-7 with a 160hp Subaru and he had a
terrible problem with vapor lock.  IMHO, as long as we are flowing fuel
back to the tank there will be little issue with fuel vapor lock in our
systems - a very big advantage over systems that do not return the fuel.

Another disadvantage of the filter you mention is that it must be on the
low pressure side of the fuel pump(s) requiring you to place the pump a
long way from the tank - another ill-advised maneuver.

David Leonard
The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html

I agree that it could be a problem and it is safer with the current (old) Mazda
EFI system to route the fuel back to the tank.

I am not sure vapor lock is a real problem in a high pressure system with the pumps
mounted in or near the fuel tanks. I think it might be a problem
with the high pressure pumps mounted under the cowl. I also think
if you keep the fuel lines away from the exhaust system and insulate
them it will not be a problem with the pumps mounted under the cowl.
I think it is primarily a problem with mechanical pumps mounted
on the engine. Do you have any details on that Subaru RV7?

Paul Lamar
 
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