Carb Issue

[thatoneguy]

I am having a frustrating issue with a Motorcraft 2150 carb that I just did a rebuild kit on. I put it on my 351M and it ran great for all of about 5 second until the bowl overfilled, dumped fuel out of the vent tubes and flooded it. I popped the top cover off and the float is at the right level but it doesn't seem to be stopping the fuel. I pulled the float and needle out to run a bit of fuel through it in case there was some dirt, etc. in there but it made no difference. After that, just for S&G, I adjusted the float a bit more but it didn't seem to make a difference either. I then tried to turn it over while manually holding the needle down and it did not overfill. I am at a loss, any ideas on what to check now?

[71Fe2O3]

Assuming that it didn't do this before the rebuild, and that you didn't change anything else (fuel pump?) it seems that you didn't get something quite right when you reassembled the carburetor. I recently experienced something that sounds similar with a lawn mower carburetor and found it to be the needle and seat-the bowl filled, the float rose, but because the needle did not fit into the seat properly, the fuel kept flowing and the carburetor overflowed.

[thatoneguy]

Assuming that it didn't do this before the rebuild, and that you didn't change anything else (fuel pump?) it seems that you didn't get something quite right when you reassembled the carburetor. I recently experienced something that sounds similar with a lawn mower carburetor and found it to be the needle and seat-the bowl filled, the float rose, but because the needle did not fit into the seat properly, the fuel kept flowing and the carburetor overflowed.

What are you talking about? I would never make a mistake...

You are correct that it did not do it before and nothing else was changed other than the fuel filter. I ordered a new brass float to replace my foam (or whatever it is) float just for S&G, I don't really expect it to fix the issue but it is worth a shot. Good thing is, I kept the old needle/seat so I can try swapping that back in to see if something is off with the new needle/seat fitment and double check my install when I do that.

One thought I did have last night that I wish I had payed attention to when I took the thing apart: there is the 90-degree clip that clips onto the pivot for the float; is that supposed to somehow tie into the seat or carb body or something to keep the float held down at the pivot?

[idaho_cowboy]

Float adjustments can be very tricky, and even more so with the replacement neoprene or plastic (black) float. The original style brass ones are recommended. You'll get it...

- Joseph

[Manny]

One thought I did have last night that I wish I had payed attention to when I took the thing apart: there is the 90-degree clip that clips onto the pivot for the float; is that supposed to somehow tie into the seat or carb body or something to keep the float held down at the pivot?

THAT'S IT!!! You just stated your problem i think. There is a clip that holds the pivot down to the seat. If its not there the pivot can rise and overrun the needle and seat. There should be a groove in the top of the seat and the clip on the pivot captures it. Fix that you should be golden

[Manny]

Lookey here.....

http://www.allfordmustangs.com/forums/a ... c01835.jpg

Can't be like this here has to be clipped in.
http://www.allfordmustangs.com/forums/a ... b-2317.jpg

[thatoneguy]

One thought I did have last night that I wish I had payed attention to when I took the thing apart: there is the 90-degree clip that clips onto the pivot for the float; is that supposed to somehow tie into the seat or carb body or something to keep the float held down at the pivot?

THAT'S IT!!! You just stated your problem i think. There is a clip that holds the pivot down to the seat. If its not there the pivot can rise and overrun the needle and seat. There should be a groove in the top of the seat and the clip on the pivot captures it. Fix that you should be golden

Yup, that was the issue! The kit came with the new needle and seat so I am not sure why they gave me two different retainers, one of which does not fit/clip-in correctly but oh well; it runs now and runs pretty good at that . Now I just need to figure out why my choke isn't kicking off properly and I'll be dialed! Seems like the hot air tube is not getting hot air, gonna take a closer look this week/weekend but any suggestions in advance will be helpful.