Since I cannot edit my previous post, I wish to say after resoldering the stepper it works again. I managed to drive all day long on CNG.
I also managed to get the three allen bolts from the bottom out and stretch spring 105, unfortunately it did not help at all. The membrane looked fine to me, but I guess it's not good enough still as CNG still leaks in the intake manifold and chokes my engine on startup.
All I have left to do is replace the main supply hose from the vaporizer/reducer as it is leaking a lot of CNG, reducing my range.
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