BajaRon
Well-known member
My concern, strictly on speculation, is that the reprogramming was to help prevent fumes from building up and venting (possible fire hazard) from the charcoal cannister. I would suggest if you pinch the hose at least add a hose extension hose to the one coming from the charcoal cannister to vent fumes out from under the plastics so the fumes won't accumulate.
Probably not necessary for testing the pinch to see if it works. But the clamp/pinch is a temporarly troubleshoot. It is not going to work long term.
As you say, if the pinch works then you need to take the next step to modify the system to make it work long term. I think Lamont has a "How To" video for this on the Shop Talk forum.