Re: Carbs evaporating gas ?
[Re: 420SIX]
#2672842
07/02/19 04:50 AM
07/02/19 04:50 AM
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Joined: Mar 2011
Posts: 1,653 Cut and Shoot, TX
kentj340
top fuel
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top fuel
Joined: Mar 2011
Posts: 1,653
Cut and Shoot, TX
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Today's gasoline is formulated for closed injection systems with no regard for evaporation qualities.
Back in the 60s and early 70s, gasoline was formulated to retard evaporation, since almost every car had carburetors open to the atmosphere.
So yes, today's gasoline evaporates much faster than back then.
The plus side is, when the gas evaporates, it does not leave the varnish and other crud that it used to.
The solution is to spray carb cleaner in the intake to allow the engine to start up and pump gas into the bowl. Either that or install an electric fuel pump to be used temporarily during start ups after the bowl goes dry. But don't plumb it so the mechanical pump is trying to pull gas through the electric pump - that won't work.
If you don't see two dolphins, you need a vacation.
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Re: Carbs evaporating gas ?
[Re: kentj340]
#2672898
07/02/19 08:58 AM
07/02/19 08:58 AM
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Joined: Jan 2003
Posts: 12,076 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,076
Benton, IL.
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Either that or install an electric fuel pump to be used temporarily during start ups after the bowl goes dry. But don't plumb it so the mechanical pump is trying to pull gas through the electric pump - that won't work.
Must disagree on that. I have done it that way for many years. Carter mechanical pulls through a Holley electric. Has the OP blocked the exhaust cross over in the intake?
Master, again and still
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Re: Carbs evaporating gas ?
[Re: DaveRS23]
#2672923
07/02/19 10:01 AM
07/02/19 10:01 AM
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Joined: Jan 2010
Posts: 667 Los Osos, Ca
CKessel
mopar
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mopar
Joined: Jan 2010
Posts: 667
Los Osos, Ca
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On the FBBO site, one of the posters found that the current fuel was boiling at 150*. Under hood and running temps are considerably higher.
Carl Kessel
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Re: Carbs evaporating gas ?
[Re: TJP]
#2673323
07/02/19 06:35 PM
07/02/19 06:35 PM
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Joined: Jan 2003
Posts: 12,076 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,076
Benton, IL.
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Either that or install an electric fuel pump to be used temporarily during start ups after the bowl goes dry. But don't plumb it so the mechanical pump is trying to pull gas through the electric pump - that won't work.
Must disagree on that. I have done it that way for many years. Carter mechanical pulls through a Holley electric. I'll agree with Dave as I to have done the same. But be aware that the electric must be on when romping on it as it does cause a restriction that will result in a loss of fuel pressure / flow. Yep, I run a micro switch on the carb's secondaries to trigger the electric pump along with a manual switch under the dash..........just in case.
Master, again and still
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Re: Carbs evaporating gas ?
[Re: DaveRS23]
#2673340
07/02/19 07:23 PM
07/02/19 07:23 PM
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Joined: Jan 2005
Posts: 4,406 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,406
Michigan
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Had similar issues with AMC 360 4bbl and cast iron manifold. A phenolic carb spacer fixed the issue. Ordered it off summit.
1987 Fifth Avenue - 512/518/D60
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Re: Carbs evaporating gas ?
[Re: gtx-guy]
#2677735
07/15/19 06:29 PM
07/15/19 06:29 PM
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Joined: Jan 2004
Posts: 357 The Garden State
LimelightCuda
enthusiast
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enthusiast
Joined: Jan 2004
Posts: 357
The Garden State
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Has anyone ever tried the Cool Carb stuff? Just wondering if it actually works.
Phil
1970 Barracuda Gran Coupe 1970 A66 Challenger Convertible
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Re: Carbs evaporating gas ?
[Re: LimelightCuda]
#2677802
07/15/19 10:00 PM
07/15/19 10:00 PM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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I have run the Cool Carb plate on my 340 for about five years or so. It does cool the carb! I have stopped the car in a parking lot, opened the hood to feel the carb to find it cool and sweating. It was strange. But it does get hot after a normal cool down process. But while driving, it seems to make a difference with the air passing around it. There is a max temp that CC specifies. Get your tuning correct and you should not have problems. I have had manifolds, iron J heads, aluminum heads, and headers on this engine and each time I pull the carb I make an effort to check the spacer plate. I have not had any problems but others will show pictures of the spacer plates melting. The owner is a nice guy and I would suggest to ask him what his max temp is and decide from his answer. He has a cool story on how he chose this material. 👍. If I remember correctly, it was used as a heat sinc material where he used to work.
Last edited by YO7_A66; 07/16/19 07:28 AM.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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