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  Carb spitting fuel under heavy acceleration

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Author Topic:   Carb spitting fuel under heavy acceleration
Pierre
Gearhead

Posts: 557
From: Near Paris, France
Registered: Apr 2002

posted 11-25-2003 08:19 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
It will sometime happen under heavy to WOT accelerations (above 3K) and smells like unburned fuel coming back out of the carb (I plugged the breather to verify that). It usually coincides with a noticeable loss of power !!

Some king of missfire ?
(Using all new ignition equipment + MSD6A)
Aside from that engine runs perfect no other complaint
Thank for any input

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adragon8u
Gearhead

Posts: 4975
From: Oceano, Ca. member# 2895
Registered: Mar 2003

posted 11-25-2003 09:36 AM     Click Here to See the Profile for adragon8u   Click Here to Email adragon8u     Edit/Delete Message   Reply w/Quote
are the float bowls adjusted?

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http://webpages.charter.net/adragon8u/mystang

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Pierre
Gearhead

Posts: 557
From: Near Paris, France
Registered: Apr 2002

posted 11-25-2003 09:44 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by adragon8u:
are the float bowls adjusted?


Yes (Holley 600CFM double pumper), I have paid extra caution to the adjustments of the carb & the ignition system.
My own analysis of the problem tells me that this is a slight missfire situation due to some random electrical issue on a wire or interferences with the MSD box trigger wires, bad ground......

But I want to get you guys opinion

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Moneymaker
Administrator

Posts: 26242
From: Lyons, IL, USA
Registered: May 99

posted 11-25-2003 10:45 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
If you are suspect of the carb, you may have some float vent sloshing under acceleration Pierre.
Try connecting the vent tubes with a length of 3/8 rubber hose. 6 inches should be plenty and there is no need to clamp it. Take some wire cutters or a razor blade and cut a small slot in the center of the hose at the apex of the hood side.
If slosh over is the problem, this will cure it.

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Pierre
Gearhead

Posts: 557
From: Near Paris, France
Registered: Apr 2002

posted 11-25-2003 11:05 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
If you are suspect of the carb, you may have some float vent sloshing under acceleration Pierre.
Try connecting the vent tubes with a length of 3/8 rubber hose. 6 inches should be plenty and there is no need to clamp it. Take some wire cutters or a razor blade and cut a small slot in the center of the hose at the apex of the hood side.
If slosh over is the problem, this will cure it.


Hey ! Didn't think about that , makes sense though. I will give it a shot

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