If there is something stuck in the needle and seat, you might try putting a few puffs of compressed air into the carburetor inlet. I have done this on two occasions to dislodge debris that became stuck in there causing the carburetor to malfunction.
A vacuum gauge/pressure gauge is a pretty inexpensive and useful tool. You can get one at the local auto parts store for about $20.
Don't rely on the fact that your fuel pump is new to assume that it's working properly. I had to replace two brand new Carquest pumps recently because one failed after a few hundred miles and the second one wouldn't pump a drop straight out of the box. I ended up having my original glass bowl type rebuilt.
The 216 requires 2-4 psi fuel pressure. Not sure what your engine requires but if the new pump is putting out too much pressure it could lead to the problems you describe.
Last edited by Otto Skorzeny; 11/12/2022 6:05 PM.
