[DeTomaso] NPC-Carb boiling fuel?

Asa Jay Laughton asajay at asajay.com
Sun Mar 18 00:01:33 EDT 2007


I don't remember everything, but I seem to recall that Brass floats, and 
Plastic floats are set -differently-.  You may want to check specs with 
the float manufacturer or carb rebuild guys.

Asa Jay

Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1973 Pantera L 5533
[ASASCAT]
    
******************************     
http://www.asajay.com
http://www.351c.info
  



Tom Di Iulio wrote:
> 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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