I have been having trouble on the 75 truck. It seems like it is getting too much gas to the carb. I tried resetting the float and when it is at the spec on the carb kitj(3/8 gap 1 1/4 drop) it floods, alittle up and it doesnt keep running. Any tips? suggestions. Fouling inside plugs, as it would follow.
Just rebuilt carb in may. Been running alright, but flooding.

 

If its been flooding its not "running alright". You may want to think about the float being heavy or leaking. The brass ones can develop a leak and the fibre ones can become a sponge. Thats what the little scales you could once buy at a parts store were designed for. To weigh the float. Now they are drug parafanalia.

 

any idea about correct weight?

 

No, not really. I just remember seeing the specification in the old (good) manuals like Motor and carb kits. I dont think the kits even have the specs any more. Not sure. I'm having the exact same problem as you. Mine floods while the engine is not running. Like stopping at a store. Come out, its flooded. I didnt try a different float setting because I think I have a leaky needle valve. You can listen and very faintly hear a hissing sound. I believe its gas barely passing the needle. That is why it doesent seem to flood at all while running. Its consuming enough fuel to keep everything at normal levels. My crazy Autolite carb doesent even have a needle and seat. It has some pin with a flat tipped end to do the sealing job. The seat doesent look removable. The kit doesent have one like it. Funny the kit has one of those nice screw in pointed needle and seat. Everything else fits but what I needed. Weird....

 

yeah its real nice how that works. I think I have mine set and it wasn't the float. I have traces of gas on the intake sometimes after it has run short stop and go stuff. Maybe a leaky intake to carb or carb internal float to air horn gasket? I think so. We'll see.

 

I'm no expert but I have had considerable experience with carburetors in general. I am new to the Ford single barrel unit like I have. In most cases if you understand carburetor theory of operation and have got your feet wet with a few rebiulds under your belt you should be able to tackle most jobs with success. Especially a non emissions single barrel. I hope mine doesent get the best of me. I really need to get a Carter YF and forget about the Autolite junk. Couldnt believe a local salvage yard told me on the phone that they had no Carter YF/YFA's at all. I think the guy just had too many phones ringing and didnt want to deal with my call.

Anyway I seriously doubt any of the gaskets you mentioned would cause fuel to spill over into the intake unless possibly parked on a hill. I really think we both have the same problem. Again a very minute leak past the float needle. With a correct float setting there should not be a high enough fuel level in the bowl to allow spillage over the airhorn gasket surface.

 

That makes sense. In the past week on that large hulking auction site there were 3 or 4 carter yfs for about 35 bucks. Not much more expensive than a rebuild kit and parts. I will check out the needle, but I think that was all new in my kit. It is running much better and I see few if any signs of gas now that I readjusted the float though.

 

Have you checked your fuel pressure? Some carbs can be overpowered by the fuel pressure. John

 

To Gregus I'm glad one of us got our carb problem sraight. I'm still not driving mine. I cant pour out silver dollars. In the days when it was pennies I might have kept going and dealt with it. Not now!

As far as fuel pressure I am operating a fairly vintage mechanical pump. Heck, the darn filter I removed was a 1965 Rotunda. Well may be a 65 pump. I know of no condition that would cause high pump pressure. I've heard of people going down to Autozone and asking for an electric pump not being specific enough or bearing the knowledge to make sure they get one for a carburetor instead of F.I. which now is more common. The F.I. pump will overwealm the carb float setup. Anyway I dont think I will have to worry about pressure. Thanks for the thought..

Greg

P.S. "Heck, the darn filter" I know this is not the normal way I talk. That is unless I survive a Leave It To Beaver marathon on Nick At Night. This site is G rated. Very G rated but thats OK, especially in our current age of immorality. I'm just trying to stick by the rules as instructed. I slipped a couple of times. This is a great site so lets keep it clean! Darnit!

 

My old 1970 E100 with a 4.9L engine from a 1975 F100 was flooding and running erratically at low speed. It was also hard to start if left sitting over a weeks time. It turns out the accelerator pump diaphragm was pourous (rotted over the years) and leaking fuel into the vaccum port at the base of the throttle body. It seems rebuilding kits are concerned about this area because they call out a special gasket that goes between the diaphragm and main body of the carb to prevent leakage. The diaphragm is supposed to have fuel on the upper side to discharge into the venturi when opening the throttle. The bottom of the diaphragm is exposed to manifold vaccum to regulate the height of the metering rod. If the diaphragm is leaking, it allows unmetered fuel to be drawn into the intake manifold while the engine is running causing too rich a mixture. With engine shut down the bowl drains through the diaphragm into the intake manifold causing flooding and hot restart problems. If the engine is not started for weeks, all fuel will be drained from the bowl with subsequent long starting times cranking the starter waiting for the carb to be filled by the fuel pump.
With the carb removed and full of fuel, make sure there is NO fuel leaking from the bottom of the throttle body. My diaphragm was rotted enough to allow an easy diagagnosis.
Hope this helps as I know its on the long winded side.

 

...Welcome Craog Crippen, to Ford Truck Enthusiasts!

Enjoy FTE....and
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…..See you on the boards.

 

I would recheck the specs you are using to make sure that they apply to your carb. In looking through the Haynes manual it shows some widly different float specs from year to year.

 

Craig Crippen,
you get the prize. My 81 had exactly symptoms stated by others on this thread. Pulled the carb apart and accelerator pump diaphram was cracked and porous. Rebuild kit made it run like new again. Thanks again.
Borderbuster