I thought of that too, and began to post on that, but thought better of it, as I realized that if gov pressure was working, theres more than enough pressure to blow that 1-2 valve out of "stuck". Maybe not out of "seized". But in 45 years, Ive never seen seized, so I let it go.
It just seemed far more likely to be the gov, especially since it happened to me once.
It does seem strange though, that the OP makes no mention of any issues prior to VB exchange. But then with a manual VB, the gov circuit is ignored or blocked anyway. Did I say blocked?
Crap there it is!
I forgot about that. In the old days we used to drive a cup-plug into the gov passage when installing a manual VB.
