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

The Subaru RV-7 first flew about a month ago out of Cable (NE L.A
Basin).  He is sponsored by Subaru!!  He was at Osh this year.  Although
it is a 160 h.p n/a engine he seems to be making only about 130/140hp
(and he is using the MT c/s prop).  He had problems with vapor lock that
he has solved and has some cooling problems.  When those are solved he
plans to install the supercharger he has and 'expects' about 260hp.  (I
wouldn't fly behind a Subaru that was really making 260 hp.)

But, his was a nice FF installation.  He is flying and I'm not.  :-)

David Leonard

 
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