I've got a '66 F100 I recently bought and it runs rather fine under most
conditions, but if you put a sudden jolt on the gas (not hard even, like 1/4
the way in) the engine shuts down. After a couple seconds you can start it
back up and it'll run fine again. I'm running the truck with no choke like
stated in the original manuals.
The problem is that coming from a stop and trying to get it back up to
roadway speeds takes so long it isn't funny, you have to press the gas so
slowly that everyone behind me gets pissed, or press it firmly and it'll
sounds like its carburator rebuild time... the part of the carb. thats
called the accelerator pump is messed up.... it floods when giving it
gas and it kills... you wait for the flooding to dry up and it starts up
Probably so. If it's like the carter YF one barrel, it may be one,
when the pump diaphram goes bad, not only do you lose pumping action ,
but it also can drain gas down into the little "swimming pool" that
the pump housing sits on. Normally, that housing should stay dry. But
if it drips, the gas runs down a little drain hole at the bottom of
the housing, and mixes with the normal mixture. So you get lousy
pumping action when you press the gas, and it's also screwing up the
idle mixture. It will drip, drip, drip. The idle will go from normal
to crappy in a regular cycle. Acts like a vacuum leak the way the idle
hunts around. If this is the case, you will see the taletell sign of
gas leaking from the bottom of the carb when you pull it off. If it's
real bad, you won't even have to pull it off. Gas will be dripping
around the base. If the diaphram were totally shot, it could dump gas
pretty fast, and cause the flooding decribed. Also, I'd check the
filter and pump, and float and float needle and seat. Sometimes you
can find just the pump, but if not, he'll have to buy a rebuild kit.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.