BigT-65

I search for a thread on this subject and found a few relating to WCFB carburetors but mine is an AFB. If I coast around the turn the car stalls if I give it a little gas around the turn it keeps running but stumbling. Does this sound like the float level is too low?

hedgehead

Or maybe too high, but a good place to start.

SpartyGW

Too high, since it stalls with no throttle but will keep running with some throttle.

If it were too low and you gave it throttle you would be exacerbating the problem by adding even more air and no fuel.

Frankie the Fink

It DOES sound like a float problem. These carbs are different than WCFBs.

First off the float level is measured withOUT the air horn gasket on and the float level (and drop) should be measured at precise locations on the float - your shop manual shows where and how. The level can be set with a 5/16" drill bit - works nicely.

Second these float bowls have baffles in them. Thin sheet pieces of metal to prevent sloshing and spill over - don't be so sure you have them. One pair in the carb body and another pair in the lid. I have a professionally rebuilt (supposedly) AFB that was missing the baffles. The former can be seen in my picture.

Third - the floats must be precisely centered -- the float should be parallel with the outside edge of the air horn gasket ridge running alongside it (again its in the manual) otherwise they can 'hang up' on the side of the bowl during hard maneuvers.

Fourth make sure your floats aren't sinking and don't have leaks. I'd replace the needle valve and seats too. www.daytonaparts.com has the best float set ups going -- talk to Ron.

You can take the top off the carb without removing it from the engine and fix all this in 1/2 hour...if you have the parts at hand!

SpartyGW

Hey, that's a really good idea. I didn't think of that when I was messing with my floats trying to use a caliper.

BigT-65

I do have the baffles both in the bowls and next to the needle valves in the top. I took the top off and checked all this stuff today. As it turned out my floats were a little off from spec. After a lot of tweaking I got them set exactly according to my gauges. I put it all back together and went for a test drive. I made some hard lefts and rights and the problem was gone. I agree with SpartyGW's logic that the float level was too high. My shop manual says to check the floats with the gasket on?? That's the way I did it.

Frankie the Fink

If it worked then it worked - good for you..

BigT-65

Damn, Here it is a year later and the left turn issue is back. I had the engine professionally tuned about 10 months ago and other than the left turn problem the car is running great. Better than ever. I hate to take the carb top off because I don't want to inadvertently mess up the tune up.

Frankie the Fink

The left hand 'bobble' on the WCFBs is an idiosyncrasy of those carbs; I doubt your issue is related. If it didn't just occur I'd be tempted to say it was a float hanging up in the bowl on a hard turn. Just for grins run a bottle of fuel system cleaner through a full tank of gas. Who knows...a few bucks and maybe you get lucky...maybe just some trash got in the carb somewhere.....can't hurt...

All of m advice in post #4 above still applies...

LT1driver

don't turn left, problem solved....sorry had to say it. others before me have all given good advice so other than being a smart*** can only say good luck and enjoy the ride.

Bluestripe67

It's my understanding that what you are experiencing is very common on AFB's. The float setting are very sensitive, both float drop and float level. Any goop or debris could be your problem. I agree with Frankie's option. Dennis