Forum Discussion
Chris_Bryant
Aug 18, 2013Explorer II
The marked plug is what I was wondering about-

This will be a pressure test port after the valve, so you can check the valve by having the LP place measure the pressure at this point. If it is still 11" with it on high, the valve is fine and I would just replace the orifice. If it is lower, try without the filter, then replace the valve.

This will be a pressure test port after the valve, so you can check the valve by having the LP place measure the pressure at this point. If it is still 11" with it on high, the valve is fine and I would just replace the orifice. If it is lower, try without the filter, then replace the valve.
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