I run a 2.4 liter VW, with gravity feed, Zenith carb and Facet pump. I
could not get enough flow through the Facet, and I suffered the same
unpredictability, so I tried various solutions. I first tried to increase
the inner diameter of the fuel line. I then tried to buy a check valve
from Aircraft Spruce. Can't remember the name, but it clearly was a very
old part, manufactured way before I was born. The break out pressure was
too high, so I gave it up. What I now plan to do is to run two feed lines
in parallel. One will go through the Facet, and the other will be free
flow, and they will join just before the carb. So, basically, what you
describe, minus the check valve. I think it will work, and I see one
advantage: when the Facet is on, it will build less pressure against the
carb when the float bowl is full.
Serge Vidal
KR2 "Kilimanjaro Cloud"
Paris, France
"Ron Freiberger" <ronandmar...@earthlink.net>
Envoyé par : krnet-boun...@mylist.net
2005-06-08 16:38
Veuillez répondre à KRnet
Remis le : 2005-06-08 16:40
Pour : "KRNET" <kr...@mylist.net>
cc : (ccc : Serge VIDAL/DNSA/SAGEM)
Objet : KR> Facet Pumps and Gravity Feed
This has been covered before, but I'll do it one more time. Facet
pumps have a check valve, and the "cracking" pressure is inconsistent.
I have measured it as high as 20 inches of water. You must have a bypass
check valve or a second fuel pump, such as engine driven, etcetera.
There is a very good one in A/S, search for ANDAIR Check Valve.
Built from aircraft grade Aluminum and anodized for corrosion protection
this lightweight and compact unit is excellent. The check valve is ideal
for tank vents and high pressure fuel pump bypass lines. Its extremely
light weight internal shuttle operates with the slightest pressure yet
the internal O-ring seals allow the unit to be used up to 50 PSI. Other
qualities include break out pressure less than 1 PSI, great flow
characteristics around shuttle, and bleed allows shuttle to weep off
pressure in the event of a blocked line. Features AN-6 (3/8") fitting on
bottom. Valve measures 5/16" dia. x 2.75" long.
.Tlongcrier alludes to this variability is his email. Failure to ensure
a good bypass is an accident in progress. An intermediate problem is
unobserved lean mixture which eventually creates it's own set of
problems.
Ron Freiberger
mail to ronandmartha"at"earthlink.net <mailto:rfreiber...@swfla.rr.com>
(replace the "at" with @)
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