Thanks Jerry, but Carter did not specify a YF specifically for the GMC 228. GMC 228 original Zenith carburetors are fairly easy to find, and nowhere near as expensive as the GMC 270 carburetors. I would suggest an original Zenith for the 228.
But before doing anything to the carburetor; check the fuel pressure. Very easy to blame the Rochester B for anything that needs blaming (and generally one would be correct
); but even a Rochester B has no chance if someone put on an electric fuel pump without a bypass style regulator, or one of the new off-shore made mechanical fuel pumps. We tested a brand new 2019 pump from a very well known American company (this one made in China) that was rated 5 1/2 psi and put out 13.
Testing to determine the faulty component is important.
Jon.
