No check valve on the intake vacuum. Try taking that line loose from the intake, put a small piece of extension hose and apply vacuum from another source and see if it opens up.
Sounds like the low pressure valve could be stuck or gummed up a little. In that case you'll have to take the regulator apart and see what you have. Two tricky parts on that: One is that the screws my be a little corroded on the threads so take it easy and, Two is peeling the edge of the rubber diaphram off of the housing without tearing it.
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Today's Featured Article - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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