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Hard Start Cold (4/14)
 11/17/05 1:09pm
Willis76Lifetime Member
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Rockland, MA - USA

Vette(s):
76, L48, 4spd & 09, LS3, 6spd


Joined: 1/30/2003
Posts: 582

Thanks Sarge and Ken for your responses. I have a carb book by Doug Roe and saw a picture of the plugs you are referring to.

Does that fuel leak into the throtle body or out through the gasket? I have never seen what appears to be a leak around the gasket.

I'm still trying to figure out how a carb is supposed to work. With Doug Roe's book, and the the write up that Ken did - I seem to comprehend a bit more each time I go through it, but those first two or three attempts were very discouraging to say the least. 

I still plan to rebuild it myself, but I need to get my confidence level up just a bit more. 

Thanks again -

 



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Hard Start Cold (5/14)
 11/17/05 4:44pm
Gunslinger
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Frederick, MD - USA

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1969 convertible L71 427/435 4-speed black interior


Joined: 9/8/2003
Posts: 3398

Something else to consider...besides what has already been said regarding the carburetor, gasoline today is blended primarily for fuel injected cars and evaporates quicker than the gas available when our cars were built, resulting in the need to crank the engine and pump the pedal more to get fuel into the carb to begin with. If your carb has any problems, this just aggravates the situation.
Hard Start Cold (6/14)
 11/17/05 9:32pm
kstyerLifetime Member
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CUYAHOGA FALLS, OH - USA

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1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!


Joined: 12/2/2003
Posts: 6415

Typically the fuel that leaks drops down on the throttle and into the intake.  It slowly evaporates from there leaving no trace.  Due to the air cleaner you normally won't even notice a smell.
Hard Start Cold (7/14)
 5/4/21 11:53am
Corvette-Ron
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, - Canada

Vette(s):
1976 Stingray, blue, 4 spd., one owner (me)


Joined: 7/16/2007
Posts: 11

Yes, I've tried just about everything I can regarding the hard starting of my '76, including the 'well plugs'.

I've decided it is the loss of the anti-evaporation additive in modern fuels that is causing it. 

Oh well, just keep cranking.



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Re: Hard Start Cold (8/14)
 5/4/21 1:29pm
johnu
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Scottsdale, AZ - USA

Vette(s):
1981 Corvette Two-Tone Claret color, 4 spd, C7 Vert


Joined: 5/23/2007
Posts: 594

New fuel pump in recent history?



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Re: Hard Start Cold (9/14)
 5/4/21 2:12pm
Corvette-Ron
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, - Canada

Vette(s):
1976 Stingray, blue, 4 spd., one owner (me)


Joined: 7/16/2007
Posts: 11

Alas yes, last year, didn't make any difference.



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Re: Hard Start Cold (10/14)
 5/5/21 11:26am
F4Gary
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Grapevine, TX - USA

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1972 LT-1 convertible with factory air.


Joined: 8/26/2006
Posts: 1069

Gunslinger said: Something else to consider...besides what has already been said regarding the carburetor, gasoline today is blended primarily for fuel injected cars and evaporates quicker than the gas available when our cars were built, resulting in the need to crank the engine and pump the pedal more to get fuel into the carb to begin with. If your carb has any problems, this just aggravates the situation.


It's not blended "for fuel injected" cars.  It's blended for the EPA and their stupid regs.

My Holley carb doesn't have this problem. Starts right up after sitting for a month.



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Re: Hard Start Cold (11/14)
 5/9/21 1:23am
johnu
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Scottsdale, AZ - USA

Vette(s):
1981 Corvette Two-Tone Claret color, 4 spd, C7 Vert


Joined: 5/23/2007
Posts: 594

Mine is a few cranks quicker.. 

Set the choke for a cold start, turn the key, crank the engine while pumping the gas and stop after 5 seconds. ( I "imagine" the fumes slowly traveling down the intake to the heads).  Turn the key, crank and give it a little gas and it fires off.   The sequence is no different if I crank it for 20 seconds.  Mine demands a pause and fires off at "round two"

The choke sets fine and OEM coil spring pulls it off perfect as it warms.

This is the best mine gets!   I've had the Quadrajet rebushed and plugs epoxied. A new fuel pump might have cut a second or two off the cranking.  It's been like this for 30 yrs so I'm at peace with it.

 

 



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Re: Hard Start Cold (12/14)
 5/9/21 6:32am
Corvette-Ron
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, - Canada

Vette(s):
1976 Stingray, blue, 4 spd., one owner (me)


Joined: 7/16/2007
Posts: 11

I'll try the two crank start.

Mine has only been like this for about ten years.

That is why I think it is the deletion of anti-evaporation additives in fuel.



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Re: Hard Start Cold (13/14)
 5/11/21 10:43am
johnu
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Scottsdale, AZ - USA

Vette(s):
1981 Corvette Two-Tone Claret color, 4 spd, C7 Vert


Joined: 5/23/2007
Posts: 594

Surprising followup:  My C3 has sat for 6.5 months.  I turned the key and it fired off on the 3-4 rotation of the engine!



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Re: Hard Start Cold (14/14)
 5/18/21 7:22pm
Steevo
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San Diego, CA - USA

Vette(s):
'73 Coupe, 350, Auto, A/C, Electric Windows. White exterior w/ Dk Blue interior.OEM Aluminum Wheels


Joined: 11/10/2013
Posts: 15

Or, you could get one of these.🤡

But seriously Willis, I agree with those here who bitch about the fuel. It's a power-robbin' jet-pluggin' blend that's here to stay. I've got your same problem with the carburetor on my '80 Toyota 4x4. I am sentenced to carb rebuilds much too frequently, just in order to pass this state's smog test. The Rochester I had on before was prone to being "dry" after just a couple of days sitting. I now now where the fuel was going, thanks to responders above.

Good luck on the fix.

Steve



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