The pinch test is a good way to introduce pin holes in the fuel line. I quit using it after finding a spray that I though was a cob web floating out of the engine compartment when fueling the tank. Close examination showed the marks from pinching and the cut in the line. I don't use that method any longer, and have never missed it.
Don
ORIGINAL: kochj
I am assuming you know how to do the pinch test???? the engine should idle up, when pinched and then quit....
If at idle and you pinch it, and it runs and runs and 10 sec later, it increases rpm's then your LSN is too rich...
If when pinched and it quits almost immediately ... then too lean..