boiling gas in the carb
#667330
04/11/10 08:25 PM
04/11/10 08:25 PM
|
Joined: Oct 2006
Posts: 7,066 portland or
new bee
OP
Richard Cranium
|
OP
Richard Cranium
Joined: Oct 2006
Posts: 7,066
portland or
|
I am having a small problem with my 69 Super Bee. When I take it out for a drive, everything is fine until it's fully up to it's normal temperature. At slower speeds, it starts to surge a bit until I give it a bit of gas. Once I let off and slow down, the surging continues. It's not really dramatic, but it is noticeable. When I am back from my drive, I pull it into the garage and shut it off. If you listen to the carb, you can here boiling. And, once it sits for a few minutes, it smells very strongly of gas. If it helps, it is hard to start sometimes when cold (and sometimes when it's warmed up). The engine is built to stock specs with the exception of a slightly hotter cam. I am temporarily running a brand new Edelbrock Thunder series carb while my stock Carter is being restored. I checked my fuel lines and filter, and they are all located where the factory would have put them. They are not close to heater hoses, exhaust manifolds or the intake manifold. So, what might be causing this? All help is greatly appreciated.
*1969 383 4sp. Super Bee *1966 Alfa Romeo Giulia Sprint GT *1965 Porsche 356C *2004 VW Passat Wagon *2004 Mini Cooper S *1967 Jaguar E-Type FHC
A mall cop is in our midst.
|
|
|
Re: boiling gas in the carb
[Re: Dougsmopars]
#667333
04/11/10 08:39 PM
04/11/10 08:39 PM
|
Joined: Oct 2006
Posts: 7,066 portland or
new bee
OP
Richard Cranium
|
OP
Richard Cranium
Joined: Oct 2006
Posts: 7,066
portland or
|
I heard the spacer might do the trick. I am running a stock air cleaner and intake (ramcharger hood). Do I have a 1/4" to spare?
*1969 383 4sp. Super Bee *1966 Alfa Romeo Giulia Sprint GT *1965 Porsche 356C *2004 VW Passat Wagon *2004 Mini Cooper S *1967 Jaguar E-Type FHC
A mall cop is in our midst.
|
|
|
Re: boiling gas in the carb
[Re: new bee]
#667334
04/11/10 08:45 PM
04/11/10 08:45 PM
|
Joined: Oct 2006
Posts: 7,066 portland or
new bee
OP
Richard Cranium
|
OP
Richard Cranium
Joined: Oct 2006
Posts: 7,066
portland or
|
Also, could the surging at lower speeds (up to 40 mph, for example) be caused by fuel boiling?
*1969 383 4sp. Super Bee *1966 Alfa Romeo Giulia Sprint GT *1965 Porsche 356C *2004 VW Passat Wagon *2004 Mini Cooper S *1967 Jaguar E-Type FHC
A mall cop is in our midst.
|
|
|
Re: boiling gas in the carb
[Re: new bee]
#667340
04/11/10 11:53 PM
04/11/10 11:53 PM
|
Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
Your intake manifold is too hot. As said block ex manifold heat riser open, add a valley pan metal gasket w a blocked crossover hole(s), add a thick felpro ~3/8" spacer under the carb, no gasahol(E10), MAYBE a cooler stat. EDIT and a return line to the tank
Last edited by RapidRobert; 04/11/10 11:58 PM.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: boiling gas in the carb
[Re: BeEtLeJuIcE !]
#667341
04/12/10 01:23 AM
04/12/10 01:23 AM
|
Joined: Oct 2006
Posts: 7,066 portland or
new bee
OP
Richard Cranium
|
OP
Richard Cranium
Joined: Oct 2006
Posts: 7,066
portland or
|
I am running stock exhaust. The intake manifold is getting hot enough to burn off the paint right in the middle of it (where the heat riser attaches).
*1969 383 4sp. Super Bee *1966 Alfa Romeo Giulia Sprint GT *1965 Porsche 356C *2004 VW Passat Wagon *2004 Mini Cooper S *1967 Jaguar E-Type FHC
A mall cop is in our midst.
|
|
|
Re: boiling gas in the carb
[Re: new bee]
#667342
04/12/10 05:50 AM
04/12/10 05:50 AM
|
Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
|
Quote:
I am running stock exhaust. The intake manifold is getting hot enough to burn off the paint right in the middle of it (where the heat riser attaches).
That is normal but today's gas doesn't like this and especially gas with alcohol blends.
|
|
|
Re: boiling gas in the carb
[Re: buildanother]
#667344
04/12/10 08:01 AM
04/12/10 08:01 AM
|
Joined: Jul 2008
Posts: 30,430 Florida STAYcation
BeEtLeJuIcE !
The village idiot's idiot
|
The village idiot's idiot
Joined: Jul 2008
Posts: 30,430
Florida STAYcation
|
Quote:
If the heat riser in manifold gets stuck in the closed position, that can make today's fuel boiling problem even worse.
x 2 ... this was my reason for asking about what type of exh sys you had.
I would PULL the pass side manifold and REMOVE the flapper completely.
|
|
|
Re: boiling gas in the carb
[Re: Mr.Yuck]
#667346
04/12/10 11:42 AM
04/12/10 11:42 AM
|
Joined: Oct 2006
Posts: 7,066 portland or
new bee
OP
Richard Cranium
|
OP
Richard Cranium
Joined: Oct 2006
Posts: 7,066
portland or
|
For the record, the exhaust manifold heat thing was removed and the hole was welded-up.
*1969 383 4sp. Super Bee *1966 Alfa Romeo Giulia Sprint GT *1965 Porsche 356C *2004 VW Passat Wagon *2004 Mini Cooper S *1967 Jaguar E-Type FHC
A mall cop is in our midst.
|
|
|
Re: boiling gas in the carb
[Re: new bee]
#667348
04/12/10 12:06 PM
04/12/10 12:06 PM
|
Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
|
Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
|
Quote:
Also, could the surging at lower speeds (up to 40 mph, for example) be caused by fuel boiling?
It's caused by leaness.
|
|
|
Re: boiling gas in the carb
[Re: Challenger 1]
#667349
04/12/10 12:08 PM
04/12/10 12:08 PM
|
Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
I run E10 (gasahol) in my eddy 1406 on a 318 & no issues. Something is heating your intake and boiling the gas. EDIT what stat/eng temp?
Last edited by RapidRobert; 04/12/10 12:12 PM.
live every 24 hour block of time like it's your last day on earth
|
|
|
|
|