Carb Fuel Smell
#492864
10/10/09 02:45 AM
10/10/09 02:45 AM
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
Wolfe440
OP
enthusiast
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OP
enthusiast
Joined: Feb 2007
Posts: 217
New Port Richey, Florida
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Every time I come back from driving my 440 six pack Challenger and park it in the garage, 15 min or so later I smell fuel fumes. So for the last several times when I finish driving it I do an absolute check of everything and find no leaks, just the smell. Tonight I came home about 2am, garage started to smell soon after. This time in the absolute quiet of 2am I could just hear a soft noise from the carbs. I soon identified the noise was coming from fuel boiling in the bowls...hence the likely source of my fumes. The car runs at a perfect 170 and never overheats, everything is new and perfect shape. Its the cast iron intake, has the intake gaskets with the heat crossover blocked. Any ideas as to what I can do to stop this? Does anyone make heat spacers for these carbs? Thanks Wolfe 
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Re: Carb Fuel Smell
[Re: Wolfe440]
#492867
10/10/09 07:19 AM
10/10/09 07:19 AM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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Quote:
Every time I come back from driving my 440 six pack Challenger and park it in the garage, 15 min or so later I smell fuel fumes. So for the last several times when I finish driving it I do an absolute check of everything and find no leaks, just the smell. Tonight I came home about 2am, garage started to smell soon after. This time in the absolute quiet of 2am I could just hear a soft noise from the carbs. I soon identified the noise was coming from fuel boiling in the bowls...hence the likely source of my fumes. The car runs at a perfect 170 and never overheats, everything is new and perfect shape. Its the cast iron intake, has the intake gaskets with the heat crossover blocked.
Any ideas as to what I can do to stop this?
Does anyone make heat spacers for these carbs?
Thanks
Wolfe
What year car? Are you sure the fumes are from the carbs? Could be the gas tank vents spilling a small amount a fuel if it does not have an evap system.
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Re: Carb Fuel Smell
[Re: torkrules]
#492868
10/10/09 11:42 AM
10/10/09 11:42 AM
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Joined: Feb 2007
Posts: 217
New Port Richey, Florida
Wolfe440
OP
enthusiast
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OP
enthusiast
Joined: Feb 2007
Posts: 217
New Port Richey, Florida
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Its a 1970 Challenger. Its not venting, that was also my first suspicion, I've had problems over the years there before, but no evidence of a problem this time.
Your nose leads you straight to the carbs where its very strong. Take the filter off and it really hits you. No leaks anywhere, I even took the carbs off and looked for any problems, none found.
I have the standard metal fuel line branching to each carb, its real close to the iron intake and picking up a whole lot of heat. Last night it was super hot when I checked it, could not even touch it but for a second. I'm sure this preheating of the fuel just before its delivery is not helping. When the boiling stopped so did the smell. I found some .250 thick base gaskets, and I am going to wrap the fuel line with some asbestos and see if it this helps. Thanks, Wolfe
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Re: Carb Fuel Smell
[Re: D_C]
#492869
10/10/09 07:20 PM
10/10/09 07:20 PM
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Joined: Nov 2007
Posts: 1,522
Orleans, Ontario
moparcanuk
pro stock
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pro stock
Joined: Nov 2007
Posts: 1,522
Orleans, Ontario
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Quote:
Depending on your air-cleaner setup and hood clearance, you should be able to find Phenolic spacers, and/or mount a heat-deflector (sheet-aluminum) placed under the carbs.
If you can't buy pre-made ones, you could fabricate your own.
I tried to install one of these on my 440 4-bbl but there is not enough clearance for the air grabber setup. 
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