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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

I have to choke the carb

 
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Old 08-27-2010, 09:43 AM
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I have to choke the carb

even in warm weather when I'm starting it. It will snuff out at the stop sign right by my driveway.
Does that mean it's set to lean? Maybe re-jet to a slightly larger size?
 
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Old 08-27-2010, 11:22 AM
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Could also be a vacuum leak. Easiest way I have found to check is spray penetrating oil around the intake mounting flange and also around the base of carb, if engine smooths out or RPMs increase, you have found the area of the leak.
 
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Old 08-27-2010, 12:00 PM
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Originally Posted by mechmagcn View Post
Could also be a vacuum leak. Easiest way I have found to check is spray penetrating oil around the intake mounting flange and also around the base of carb, if engine smooths out or RPMs increase, you have found the area of the leak.
What he said. Grab the throttle shaft where the linkage attaches and see how sloppy it is. Chances are your throttle shaft and/or base is worn quite a bit.
 
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Old 08-27-2010, 12:25 PM
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It doesn't necessarily mean anything is wrong.

Even at 100 degrees (outside air temp) I still have to pull the choke cable out half way to start my truck and get it to run properly until it warms up.

How much choke are you talking about, and does the truck run ok once warmed up?
 
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Old 08-27-2010, 02:00 PM
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I have to give it half choke to start it, then drive it for a couple minutes before pushing choke all the way in. Then it runs perfect.


If the truck has sat for a week or more, I have to pull full choke and pump the gas pedal to get fuel back in the carb bowl. Takes 3 or 4 try's before it starts

Engine was completely overhauled this spring, and all gaskets are new.
Carb was overhauled also. I know the base of the carb and intake surfaces are true and flat.
 
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Old 08-27-2010, 04:00 PM
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Originally Posted by snipa View Post
I have to give it half choke to start it, then drive it for a couple minutes before pushing choke all the way in. Then it runs perfect.


If the truck has sat for a week or more, I have to pull full choke and pump the gas pedal to get fuel back in the carb bowl. Takes 3 or 4 try's before it starts

Engine was completely overhauled this spring, and all gaskets are new.
Carb was overhauled also. I know the base of the carb and intake surfaces are true and flat.
Sounds normal to me. I've been doing that for the past 10 years with my 48. Only other thing to check: Mine will act like thatwhen my points get dirty or rubbing block wears and points close up, etc. Check you point gap - it makes a big difference!
 
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Old 08-27-2010, 08:28 PM
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good idea about the points, I'll check that.
My next upgrade will be pertronix ignition.
I did that on my tractor andit was well worth it
 
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Old 08-27-2010, 08:46 PM
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What you have sounds normal to me as well. I would be happy if mine would start with only a couple of tries at full chock after sitting for a week. All of the fuel seems to drain from the bowl after three or four days - no matter what power valve and gasket combination I have tried. Enjoy the easy starting and no running problems once warm.
 
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Old 08-28-2010, 01:25 AM
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Yep, that's just exactly how it should work!
 
 
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