Hi everybody. I've always gotten great info by searching this forum. Today, I've got a question.
Here's what I've got:
63 F100, 223 (I think, but the carb appears to be from a 240 or an early 300).
Every time the truck runs for more than a minute or so (sometimes sooner), it starts over-fueling, and gas pours out the top of the carburetor where the rod from the accelerator pump goes in at the top. Then, of course, it runs worse the more a person pushes the gas pedal.
I found a kit where the gaskets line up, an early YF carb that they used on some late 60s 240s along with some early 300s. The carburetor my truck is supposed to have is a Ford model 1100, I believe. But this is just based on parts store computer research.
Either way, the kit doesn't have any kind of seal for where the gas keeps pouring out. I don't even know if it is supposed to have one. There is some damage where that accelerator pump rod goes in, like somebody went all Friday the 13th on it with a flat head screwdriver, but I don't know if that area is the root of my problem, or if it is something else, like a stuck float or something causing the carburetor bowl to keep overfilling.

I really don't know much about carburetors. Any help would be much appreciated. I am adding pictures with red arrows pointing to where the fuel comes out. Also, there is s pic showing the underside of the top piece of the carb where there is a hole that is meant for fuel to pass through.

Thanks,

Marcus


Here it is:


Close up of where the rod goes in above the bowl.


The port on the underneath side where the fuel is passing through

 

I have no experience with that particular carb, but mine would shoot massive amounts of gas out of the top and this was because the float was not installed correctly. Maybe yours need a minor adjustment.

mine is for a 292 and is a totally different carb, I'm just sharing my experience.

 

I would also check the float. Make sure its not filling with gas and staying down not shutting the fuel off. Check the float level I just had a similar thing happen with an Autolite 2100 on a 352 the float was too high and it too would flood itself. Also check the needle if everything else checks out maybe the rubber end rotted and lets gas continue to fill the bowl? I have no expierience this carb just general knowledge. Hope it helps.

 

Looking at the bottom picture it looks like your needle is missing from the seat. It's the part that your float rides aginst to shut the gas flow off. From the angle of the picture it looks like just a hole with nothing in it

 

Looks just like an Autolite 1100 to me. I've got two trucks with that carburetor.



The plunger and rod operate the bowl vent. Some rebuilders plug that and get rid of the actuating rod, but I think that they leave the passageway to from the bowl to the air horn open.

autolite 1100 question... - Vintage Mustang Forums

When gasoline pours out of the top, the needle valve isn't sealing. Possible causes are a sinking float, debris on the needle, worn needle or seat, excessive fuel pressure.....you get the idea.

 

Thanks very much. 63' f100 and PA74F250, I was leaning toward a float problem, but with my lack of carburetor knowledge, I wasn't sure. Thanks.
Roundman 50, I'll look into what you said, but I think the hole you're seeing is the vent hole that JimKoz was talking about. I'm pretty sure the needle is in one of those two molded tube shapes to the left of the float in the picture. But the previous owner took the carb to someone to have it rebuilt, so there is a good chance they might have made a mistake like that. So I'll look into that too.
JimKoz, that looks like the same carb. Maybe I got the names switched. The kit said Carter YF, but it sure looks like your 1100.
Anyway, what could I use to try to plug that vent on top? rubber? cold weld of some type? gas tank repair kit?

 

I agree with roundman50 and what is that spring hanging in midair on bottom of pic just left of the float? It's been a while since I had one of these apart, but something doesn't look right.

 

Could that be the return spring for the vent valve's actuator rod? Maybe it's fallen out of position and is keeping the float from rising enough to shut the fuel off....just a guess.

 

You make a good point. But the spring is for the rod that goes into the vent that JimKoz was talking about. It's actually laying on the workbench. It just looks like it's hanging off the carb because of the angle of the pic. I'm still going to look into the needle issue. It's kind of dirty and might not be sealing like it should.

 

If you look to the right of your float you will see where the float attaches to the carb. by a rod.Between the rod and the float you will see what they call the seat . The needle gos into that hole. When gas raises it lifts the float , the float shoves the needle up further into the hole that you see and stops the flow of fuel . The needle sets below those two flat brass prongs unless I'm mistaken I don't see the needle sticking out of the hole. I hope this helps

 

Thank you PA74F250, roundman 50, JimKoz, merlynr, and anyone I might have missed. Thank you JimKoz for explaining what the bowl vent is. I really thought it was a broken part or lacked a seal or something, but now I know it's part of the design. The float definitely wasn't moving right because, as roundman suggested, when the last guy rebuilt the carb, he completely friggin' neglected to put the needle in.
Now this might have all sounded simple to you guys, but I knew next to nothing about the inner workings of a carburetor and would likely NEVER have figured this thing out on my own.
I really appreciate all your help.

Marcus

 

 

My thoughts exactly. At least I know a little about the stupid thing now.