Need Advice - On Carb adjustment Plz

S

Stokes

Member
Hello Guys- New to the Ford Barn and these Flatheads. I have a 1938 Ford Standard Sedan with the 85 Flathead all stock. I ordered a gasket set from MAC's for my Carb because it was a little wet after my drives. Since I have installed all the gaskets the Engine is running VERY rich and I can not lean it out. Can anyone Help me figure what I may have done wrong when installing these gaskets-Thanks Dan:confused:
 
Something is leaking inside. Could be several things like to high fuel pressure, float valve not seating, etc. But, because it got worse with the rebuild I would guess a float or float valve issue. The float may not be set correctly.

There are several carb experts on the Barn that should be on here later in the day that can provide you much better advice on carbs than I can! But this will at lease give you a bump to keep you on the top side of the list. :)
 
Some of the intake manifolds have a hole that sees the hot gases that recycled through the intake manifold to heat it. If you have a 94 Carb these gases must be blocked before they reach the Carb. power valve, they will cause it to fail and this will lead to rich running and the inability of the car to restart after sitting for a short while (flooded) The gasket under the carb should not have a hole that would allow the exhaust gases to pass up to the Carb.
 
About the float setting & needle & seat (or float valve): if you can look into the carb at idle and you see droplets coming from the booster then the float is set high, at idle you should not see any fuel droplets at all. The idle circuit supplying the engine is below the throttle blades and you can't see it operating.
If when you shut the engine off and you see white vapors rising from the carb then the float is just few few thousandths high, when you see vapor and then lower the float just a little and you'll be just right. The vapors are caused by fuel wicking up from the main wells and gas moisture forms around the booster, as it evaporates in the engines' heat it turns to a white vapor.
 
Terry,OH-The new gasket did have the hole in it and the old one did not-I will swap them out -Thanks for the help-Dan
 
If that gasket change doesn't help, it may be a leaking power valve. Did you replace the power valve and/or gasket? If so, they may be the problem. A simple way to check this is to remove the top from the carb when the engine is off to make sure the float bowl is full. Then check it an hour or two later; if the amount of gas in the bowl is significantly less than before, you've found the culprit. The majority of 94 problems I have experienced are related to leaking power valves. As said many times before, later Holley power valves, while they may seem to fit, really don't and usually leak if used in the older carbs.
 
Gasket swap did not work-So I have removed top of carb and will check power valve gasket which I replaced and it seemed smaller then the original-Thanks
 
tubman said:
If that gasket change doesn't help, it may be a leaking power valve. Did you replace the power valve and/or gasket? If so, they may be the problem. A simple way to check this is to remove the top from the carb when the engine is off to make sure the float bowl is full. Then check it an hour or two later; if the amount of gas in the bowl is significantly less than before, you've found the culprit. The majority of 94 problems I have experienced are related to leaking power valves. As said many times before, later Holley power valves, while they may seem to fit, really don't and usually leak if used in the older carbs.
Click to expand...

Tubman, that is a great way to test the power valve!
Thanks for sharing!!
Joe
 
Ok Everyone-Car is now running great-Thanks for all the advice-Tubman for his leak check -It was the power valve gasket leaking-
 
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