Did this recently with a Bentley, though an in tank pump was employed and a
pressure relief valve at the fuel rail. So far so good.
Here in the southwest the road temps can get so hot that the fuel, with the
damn alcohol, will actually boil between the tank and the pump!
dave
frogeye@porterscustom.com
Porter Customs 2909 Arno NE
Albuquerque, NM USA 87107
505-352-1378
1954 BN2 1959 AN5
Porter Custom Bicycles
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-----Original Message-----
From: healeys-bounces@autox.team.net [mailto:healeys-bounces@autox.team.net]
On Behalf Of Oudesluys
Sent: Monday, November 21, 2011 8:55 AM
To: warthodson@aol.com
Cc: healeys@autox.team.net
Subject: Re: [Healeys] Ruff running, bucking car
If vapour lock in the fuel line is a constant problem you could try to
fit a return fuel line at the end if the existing line.
The return line has to go back to the fuel tank at any convenient point,
e.g. to the rubber connecting hose between filler and tank or through
the flange of the fuel meter sensor. In the return fuel line an
adjustable restrictor should be fitted so that you can experiment a bit
with flow and pressure. Pressure should be around 4psi. A small
accumulator may be needed. Easily made from a 4" length of 1/2" or
larger copper tube.
This way you will pump relatively cool fuel through the fuel line
continuously and cool the system once the ignition (and electric fuel
pump) is switched on.
Sticky valves are not the problem I think, as the problem clears after
the engine is hot and up to speed again (if you can get there). With
sticky valves the problem would worsen AFAIAC.
Kees Oudesluijs
NL
Op 21-11-2011 16:20, warthodson@aol.com schreef:
> I agree with your analysis& that is what we thought the problem was too.
It
> is true that if he lets the car cool down when sitting or if he can get it
up
> to a decent speed for a long enough time while it is bucking it will
> eventually clear up. But this is almost impossible because of the
> extreme/serious bucking. However, as I said, his fuel line runs down the
right
> side of the frame& across to the carbs in the stock BJ7 location. The
HD8s
> including intake manifold, heat shield insulating spacers are all stock.
The
> fuel pump should run continuously if the fuel is boiling in the float
> chambers. It is not. The car is not running hot. He is using premium fuel&
we
> have drained the tank& re-filled with other brands of fuel. We have
checked
> the entire fuel system for restrictions, clogged filters faulty pickup
tubes,
> etc. This only happens to his car. When we are traveling in a group (same
> conditions)& it does not happen to any of the other cars including
several
> BJ7s& BJ8s.
> Currently, I am leaning towards the sticky valve guide theory. However, I
do
> not know how to verify this theory. Any suggestions?
> Gary
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