Ok, I have rebuilt probably two hundred of these carbs in my life time. Never had much trouble with any part of them! Well fast forward to …..now.. and I am having trouble sealing the accelerator pump diaphragm on both my cars, that have those carbs! The fuel will squirt out from under the diaphragm where the lever goes. So I replaced that housing with one off an old carb I had, same thing! The carb will squirt fuel out of the nozzle just fine, so I know it’s not plugged up! Any thoughts ? TIA Bones
Fuel squirts out of the slot where the lever is ?? Not from where the housing seals on the carb ?? When you tried the old housing, did you use a different acc. diaphragm ?? I was changing fuels pumps, rubber lines on my 65 352 every 2 or 3 years Had to clean the 4100 out and replace the acc. diaphragm every 4 or so years Bought a fuel pump with a viton diaphragm and ethenol proof fuel hose I start the 352 up around once a week but was not driving it for a year or so The br*** tubes in the front booster corroded and split between the holes After repairing, the 352 still would barely run, I drained and added fresh fuel It ran fine then..... the old fuel was hard to light like kerosene Ricky.
New diaphragm on both, looks like the lever housing is flat, took another one off an old carb, same problem. I never had this problem in the past! This is new to me, just wondering if anyone else has run into this problem! I’m thinking maybe cheap diaphragms! Looks like I may have to use sealer on them! I have never had to do that before….but things change! I am using Hy-grade kits. Bones
I have had to flat file a bunch of those and on Holleys for the same reason. They may "look" flat but a file will let you know for sure. You may want to do the same to the carb itself.
Stand the cover on 4 thumbtacks in the screw holes. Use a drift and lightly peen between the holes. A little "potato chip", when viewed from the side, will add some pre-load between the holes. I do about a hundred of these a year. Have not experienced this at all. Walker kits. It's usually the powervalve cover that is bent most. You may straight edge the carb bodies to see if they are pulled up around the screws. Most of the previously rebuilt ones I see are falling apart loose or way over tight. Remember it is only a little screw into aluminum-ish metal. Mike
Thanks, I did not check the carb base it self, figuring it should be straight! I was geared toward the cover and thinking probably the quality of the diaphragm was suspect, since it was squirting right though the gap where the lever swings. Might be a few days before I get to check that. Thanks They are the factory screws, I sure. Bones
To get to the gap where the lever swings, it pretty much has to be a hole in the diaphragm. Otherwise, it's going to blow out the sides. Mike
It squirts out between the diaphragm and the housing of the carb , where the fuel is. But that happens right where the gap in the cover is for the lever! The only place where there is no clamping force on the gasket. So, I replaced the diaphragm, still leaked, so I replaced the cover, it still leaked in the same place. I removed the cover, it checked almost straight, so I straighten it some and it still leaked in the same place! My spring is also functioning. Bones
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