yup, I forgot about that--someone says fuel starvation and I start
thinking fuel, but if I was diagnosing the same problem on my own car the
first thing I'd do is look at sparks. Coils almost always start failing at
high RPM first. Quickest way to check is just to swap out coils, but if
you don't have one handy, just set your plug gap way down--like .010--and
see if anything changes. That will reduce or eliminate the symptoms from
both too small a dwell and a bum coil. don't race like that--you'll
probably foul the plugs.
-----Original Message-----
From: Russ Moore
To: kas kastner; Randy B. Williams; fot@autox.team.net
Sent: 5/16/2003 3:19 PM
Subject: RE: Fuel starvation problem
To add to the well stated points Kas makes, I have seen the foam in a
fuel
cell break down and give folks fits in trying to figure out their fuel
flow
problems. With contamination, the pump will still build pressure when
dead
ended, yet the volume is significantly down, and is then exagerated
under a
heavy load. Size of fuel line might also offer a restriction
Another possibility, yet not so likely and definately off the topic of
fuel
issues, is ignition. I have had all sorts of strange behaviors with top
end
power, which I thought had to be fuel related, it turned out to be the
ignition coil breaking down. Engine would act like it was running out of
fuel at 6500rpm. Changed that out and the problem was instantly cured
and
the engine was clean up to 8000 again.
Dwell angle can also cause some problems that can be mis diagnosed.
Russ Moore
Spitfire #49
-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net]On
Behalf Of kas kastner
Sent: Friday, May 16, 2003 4:57 PM
To: Randy B. Williams; fot@autox.team.net
Subject: Re: Fuel starvation problem
Several things. Number one is VOLUME at the carbs not just pressure.
Should
have aa minimum of 15 gals per hour. Pinched hard tube of the fuel line,
acumulation of dirt in a low section of the fuel line any or all could
give
exactly your difficulty.Also have seen a piece of paper in the fuel tank
(production tank) where it sank and closed off the supply tube.
Obviously
not likly with a fuel cell.
Easy one next, needle and seat that have crud in them and not allowing
full
fuel passage.
Next, float level too low. (too easy to be the problem)
The next one happened to me and was almost a mystery. The adjusting nuts
on
the S.U. carbs slowly closing up from resonance of engine and leaning
out
the mixture. Okay for a few laps then then the top end just goes away
from
lack of fuel. Put a wedge to stop the jet from moving up and the
problem
solved.
----- Original Message -----
From: "Randy B. Williams" <rwilliams@williamsoil.com>
To: <fot@autox.team.net>
Sent: Friday, May 16, 2003 1:23 PM
Subject: Fuel starvation problem
> I recently purchased a TR3 from Richard Hardison and could sure use
some
help
> to sort out what I believe to be a fuel supply problem. It appears as
though
> I am running out of fuel any time I have an extra long run at full
throttle.
> Richard was also having this problem, so he had his mechanice, Ed
Bernard,
> install a second fuel pump. What could the problem be and what
suggestions
> can be offered to resolve it? The pressure after the regulator is
only
just
> slightly over 2 pounds???? Randy Williams
|