float adjustment maybe???

R

retired blue

Member
I rebuilt my motorcraft 4300 4bbl and it is still flowing fuel from the top mostly from the "air valve dampner" on the right(drivers) side of the carb. Any ideas- the float is good btw and the needles are new and no junk in there as I have gone over and inside this mixer about 10 times:mad5:
any help out there? Oh and there is noting I can tell hanging up the floats
 
Have you tried adjusting the float this way and that for better or worse? Since this is a swapped on motorcraft carb rarely found on IH engines, you May be disappointed in the amount of specific advise you will receive here. Nothing personal, I assure you. Its tough for one to speak with any authority on a model they lack familiarity with. What about fomoco tech forums?
 
I thought it was funny too, but this is the same carb that has been on it for almost 20 years- and yup I have tried all over- the guys that do know want over 150 bucks to do it for me hahahaha- so I believe I will work on it some more till I get tired then junk it and go with who knows what- when I ask for suggestions the usual responce is a q-jet- or t-quad- and as you know when looking for a carb(after market) a specific year/make/model are needed:icon_eek: soooo the search continues-
I got info on a summit carb(which I do have some experience with) and will prob go with that in the end
thanks for the response though- vic-
 
Nope- it is the same pump that has been on there since ??? How can I check it?? I have no pressure gauge only a vacumm gauge
 
Same pump as in after market electric, or the oe style engine driven? Fuel pressure test kits can be had pretty cheap from harbur fake tulz. As for selecting another carb when the time comes, it shouldn't be that tough. The main thing is to know which design intake manifold you have, either square or spread bore. Then do some research and ask questions so you can buy a unit that matches the manifold. Year-make-model at that point is really of little consequence. There are enough folks who've experimented with various carb models for either manifold design to know what works well and what doesn't. For a spreadbore design, the q-jet is a popular choice, but there are others. IH app thermobogs in serviceable condition have become very scarce, and only a small percentage of builder cores are worth putting any parts and labor into to make them play nice.
 
Sorry - same pump- electric- I am gonna fool with the float some more its a pain in the ass as you well know-hahahaha- and when the time comes to throw in the towel- well I guess I will do like you say- check out what the other guys are doing and go for it- thanks for the info and I will keep you posted as to what I do- on a fixed income- it May take a while hahahaha- :whistle:
 
No, I don't know what a pain it is to set your float...I think you were being sarcastic anyway, so I believe we're on the same page. I do know how it is with a tight budget. Plenty of us around here on a fixed income in one way or another. I've recently decided that term as it applies to income is a complete misnomer. Kinda like driving on a parkway and parking on a driveway. The shit's backazzwards. There ain't nothing fixed about my income. It couldn't hardly be more broken.
Your electric pump May be pushing more pressure than the carb would like, which could be managed with a pressure regulator. Oe mechanical pumps for the IH engines are calibrated to deliver roughly 5 to 7 psi, therefore one generally wants to be in that ballpark with a lectrik pump, but certain carb models are designed to function best with even less pressure. Case in point, the weber 32/36 which is a fairly popular swap on the IH 4-poppers. Those who perform that swap must use a regulator, otherwise the carb is constantly flooding out from excess pressure. I have no earthly idea what psi your carb is happiest with, but if the pump is pushing 20 psi, one could safely assume that number is too high.
 
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