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
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