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Thanks, My Racor vacuum gauge is the thin cylinder type. that replaces the handle on top of the unit. When I stop the engine and then press the release button on the top - it takes a good minute to slowly go to zero vacuum. So there is an obstruction somewhere. The boat is a 2002, and I...

I have a Northern lights 8kw on my Grand Banks. 42 Racor 500 30 micron. The vacuum gauge reads very high, even after replacing with new filter. The engine even stopped from starvation. The other 2 Racor 900's for the cats work just fine. What could be causing the vacuum? All valves are...