Ford 4000 Holley Carb Flooding

COclodhopper · Feb 25, 2020

I have spent way too much time messing around with this carb. Never had this degree of problem from other tractor carbs. New to me tractor, was running very rich when I bought it, but was guessing a hole in the float by the way it was acting.

Now, Rebuilt carb, passages are clear, New float, new needle, seat looks fine, adjusted the float down to increase force on needle, I am sure float is not catching on the bowl, tried some different spring configurations to help the float out..... still flooding and if not flooding running way too rich. I have the idle screw shut off just to get it out of stumble stage but still too rich. I haven't even started to determine if the power boost is having issues.

I am starting to think the issue may be somewhere else. I am not used to having a fuel pump, could that be failing and pushing too much pressure to the carb? What am I missing?

Jim L WA · Feb 25, 2020

Could be the fuel pump. I had the flooding problem on my Jeep plow truck. Like you I worked on that carburetor at least a half dozen times and it would still do it. Then one day while it was acting up I reached down and whacked the fuel pump with the handle end of a large screwdriver and it stopped flooding immediately. Replaced the pump and it's never done it since.

Dean · Feb 25, 2020

The Holley carburetor is quite sensitive to float adjustment.

It is also sensitive to improper metering block gaskets found in inexpensive aftermarket carburetor kits.

Is the choke fully open?

Is the air cleaner clean?

Dean

Dean · Feb 25, 2020

Should also have mentioned that the fuel pump cannot cause flooding if the carburetor is right.

Dean

COclodhopper · Feb 26, 2020

I will try a different gasket. Choke good, air filter new, everything seems right. You say the pump cant cause flooding if carb is right, but that comes right after suggesting the Holley is sensitive and hard to set up the float. That tells me the correct fuel pressure to operate is a narrow range. If so, fuel pump behavior will have an impact.

Dean · Feb 26, 2020

If the carburetor is right, fuel pump cannot cause flooding.

If the carburetor is not right, gravity, fuel pump, etc., can cause run through.

Dean

3000OH · Feb 27, 2020

Many many posts in the archives on them Holleys. Ultradog
& I say spend the coin and get a Zenith replacement and
others love dem Holleys. I haven?t touched our Zenith since I
bolted it on over 10 yrs ago. Spendy but worth it.

Hobo,NC · Feb 28, 2020

I would say 99.9% of the time you are right... I have ran into a pump that over pressured its a rare event but the replacement did also : ( It was not on a ford tractor it was a 67 chebby 350 it did shock me it was a first so I would not say never...

To check it you would need to hook up a fuel pressure gauge... The event is so rare that would not be first on my list of things to check.

A Holley is a carburetor it suffers the same ell effects as any carburetor mounted to any engine there is no magic to it just dedication to resolve the issue.

Ultradog MN · Feb 28, 2020

Well said!

Ford 4000 Holley Carb Flooding

COclodhopper

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Jim L WA

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Dean

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Dean

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COclodhopper

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3000OH

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Hobo,NC

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Ultradog MN

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