I have disconnected the bulkhead fitting, which looks to be a spring-loaded brass valve- I assumed it was a pressure relief. I didn't see anything that looked like a filter in there.
My question about the lockoff vauum hose routing was: Where the hose connects to the engine is there any sort of valving that controls the vacuum?
The Impco compnents get cold after a while, but not cold enough to frost.
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