As some of you know, I have been rebuilding Zenith carburetors for club members and making up a club emergency parts stash. Well, for a week now, I have had a Zenith that has been giving me fits with all the dimensions correct, install it and it leaks like a sieve. There was nothing I did that would make the float close the valve.
Today the car came back to me with the club back-up carb and a new float, and valve for it. So, I set up the newest parts, install it, it leaked! Charlie suggested changing the parts out with a spare lower I have, so swapped parts, installed the bowl, DRY!
Ok, so I take a look at the original one, seems to be the same, except there is a pronounced lip along the casting seam inside the bowl. So, I get out the dremel and remove a bit of bowl interior, replace the working parts, reinstall on the car, NO LEAKS!
So, IF you have a leak you can't figure, try removing enough interior metal to allow the float to move freely up and down to close off the supply of fuel.
Today the car came back to me with the club back-up carb and a new float, and valve for it. So, I set up the newest parts, install it, it leaked! Charlie suggested changing the parts out with a spare lower I have, so swapped parts, installed the bowl, DRY!
Ok, so I take a look at the original one, seems to be the same, except there is a pronounced lip along the casting seam inside the bowl. So, I get out the dremel and remove a bit of bowl interior, replace the working parts, reinstall on the car, NO LEAKS!
So, IF you have a leak you can't figure, try removing enough interior metal to allow the float to move freely up and down to close off the supply of fuel.
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