[DeTomaso] NPC-Carb boiling fuel?

[Tom Di Iulio]

Thanks robert! 
I agree that too much fuel is being pushed in or being allowed to pass
thru unimpeded. 
The carb is new so I'm not sure rebuilding will help but it's possible
some crap is in there from the manufacturing process, good advice. The
floats were brass and he switched to plastic so he could see if they
were loading up, they're not but we can change back to brass. 
I agree that if the needle assembly was "buggered" or if fuel pressure
is too high, it should be happening all the time. still a mystery. 
Thanks!

I posted your question on a Camaro Club Forum I am a member of, hope
this 
helps.

Post 1.  Somehow too much fuel is getting in - too much fuel pressure 
(something below 8psi is ok on a Holley), the float is set too high or
has 
sunk, or something has jammed the needle valve open.

I'd suggest pulling the front fuel bowl and 'rebuilding' it, if the carb

otherwise seems ok. Dip the fuel bowl in carb cleaner for a couple
hours, 
get a new gasket set for it, change the needle/seat. If the float is
brass, 
if there's no fuel inside and no obvious damage or holes, its probably
ok to 
reuse. If its a plastic float, replace it. They are somewhat known to
absorb 
fuel over time.

Post 2. The float needle is the only way gas can get into the bowl. 
Therefore it is either dirt or bad float needle assembly or fuel
pressure is 
too high. Would be odd if it's fuel pressure as it would always be an
issue 
hot or cold, assuming constant fuel pressure of course.

Good luck

Bob
#3468
----- Original Message ----- 
From: "Tom Di Iulio" <diiulio at ix.netcom.com>
To: "Pantera" <detomaso at realbig.com>
Sent: Saturday, March 17, 2007 12:20 PM
Subject: [DeTomaso] NPC-Carb boiling fuel?


> Hi all,
> I have a friend with a 69 chevelle, 350 with holley (new) 650 dbl
> pumper, mechanical secondaries. After the car has warmed up, the carb
> will frequently barf up fuel thru the front air horn. This does not
> happen with the back bowl. The carb bowls are not so hot that you
can't
> touch them, they're relatively cool at the time so we're confused
about
> advice regarding boiling fuel. It's as if the fuel is being pushed
from
> the electrical fuel pump straight thru the carb, forming a mini-geyser
> at the front. Doesn't happen all the time but enough where driving the
> car is a dicey proposition.
> Any thoughts or advice? Thanks
> Tom Di Iulio
> Denver, CO
>
>
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