Topic: 1965 289 2 barrel flooding all the time

[DieselGuru]

I've got a problem with the carburetor on my car...  Both venturi assemblies drip fuel the whole time the engine is running - the right side more than the left.  It is making the engine run way too rich.

I took off the venturi assembly and found that the rods are in nice and tight and the machined holes are clear.  The rod and ball are in position at the bottom of the banjo bolt holding the venturi assembly in place.  Running the engine with the top off the carburetor shows that the fuel level in the bowl is correct and the needle and float are sealing the fuel inlet.

I went through the carburetor some time ago.  The problem started as soon as I had finished assembling it.  However, the unit was badly varnished before I worked on it, and the engine did not run - so I don't know if the problem existed before I worked on it or not.  But as far as I know, before the vehicle was put up for 20 years, the engine ran fine.

Does anyone have a link to an exploded view of this carburetor?  Is there supposed to be a spring between the rod and the banjo bolt that secures the venturi assembly?  How is fuel transferred between the bowl and the bottom of the venturi assembly?  Any ideas as to what to try next?

Thanks in advance!

[Soaring]

Welcome to the site.  Flooding with a 2100 Motorcraft carburetor is usually associated with either the float being set too high, or the needle and seat are worn out.  There is no spring involved except to open and close the needle in and out of the seat when the float tells it to.  If it were mine, I would overhaul that 2100 again, making sure all measurements of the float setting are correct.  You will also get a new ball  and gaskets with the kit.   If all else fails, send the carburetor to me and I will overhaul it.  If you have a regular fuel pump and not a high pressure pump, you should not be getting any flooding from a well overhauled 2100 carb.  Let us know how it turns out.   

[DieselGuru]

Even though I work at a Ford dealer as a technician, I haven't had the pleasure of working on a carbureted vehicle - at least during my professional career.  But I am concerned with the appearance of the fuel in the space between the venturi assembly and the throttle plates.  I would expect a fine mist with a few small droplets during idle operation, and a thicker, cloudy-looking mist at higher throttle openings. 

But I am seeing dribbling fuel, much like a bathtub faucet that is slightly open.  The dribble gets worse, obviously, when the throttle is opened.  Any misting is slight between the falling drops.

The needle and seat were replaced when I put the kit on.  I'm all for verifying the float level as well as the assembly of the needle and seat, and I will get right on it. 

But, while running the engine without the top plate, I can see that the fuel level is 1/2" or more below the rim of the bowl.   There is some splashing and sputtering around the needle and seat as the engine vibrates or the fuel demand goes up - but I think that is expected. 

Also, while playing around with the carburetor with the top off, I suctioned out the fuel from the bowl to remove some small bits of debris.  Right after engine restart, before the fuel bowl had filled up all the way, the venturis were dribbling again...

If it helps any, I noticed that the jets in the carburetor were marked "55" and "54."  I would have expected the same size in both bores....

[Soaring]

No, the jets are different sizes.  You have to get the right one in the right hole.  But, I don't think that is your problem.  If the 2100 is flooding, it has to do with the setting of the float, and/or the needle and seat.  I would suspect someone has put a high pressure pump on there and is giving the 2100 too much pressure.  Take a fuel pressure test to see if that may be the problem. 

[DieselGuru]

Do you know the fuel pressure specification?

[66GTKFB]

Does anyone have a link to an exploded view of this carburetor? 

I'll scan one and post it later.

Is there supposed to be a spring between the rod and the banjo bolt that secures the venturi assembly?

A gasket only. There is a ball then a rod.

How is fuel transferred between the bowl and the bottom of the venturi assembly? 

Thru the main jets up the two tubes of the venturi assy (called emulsion tubes) and thru the secondary venturies.

Any ideas as to what to try next?

Dissassemble and soak overnight in Berrymans B12. Get a can of Berrymans B12 and spray all passages. Rebuild with a new rebuild kit.
Fuel pressure should be 4 to 6 psi at 500rpm.
I find no 2100 carb with 55 or 54 jets, the jets are either 50F or 51F, and they should be the same.
On my 4100carbs, there is an additional spring on the floats (note - two) to keep them from bouncing. It is not on any Ford drawing I've seen (I didn't really look) but the carb shop I've used to buy parts from recomended the spring.
Just as I was getting ready to scan, there's the spring.
Jim

[Soaring]

This is not a 4100 carb Jim.   

[66GTKFB]

Well golly gee, I gave the jet size from a 1965 2100 cause there are too many choices if I used a 4100.
Jim

[66GTKFB]

Here are two parts breakdowns: the Ford version with Ford base numbers; and one from a rebuild kit.
Jim

[Soaring]

Good information Jim.  Thanks for posting that. 

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