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Old 11-21-2015, 03:11 PM   #47
HiDHo's Avatar
City: Scottsboro, Al.
Country: USA
Vessel Name: Hi-D-Ho
Vessel Model: 1987 Krogen Manatee
Join Date: Feb 2012
Posts: 809
My vacuum gage registers a vacuum as the filter element becomes dirty because the fuel pump has to draw the fuel thru the filter element. It's some thing I check regularly while underway along with the engine condition and shaft stuffing gland leak off. Seems to be a prudent procedure on a single engine trawler.
I'm very familiar with vacuum measured by a mercury column as was used on steam turbine driven Navy ships The column was scaled from 30" down to 20" with the other 20" of mercury in a reservoir.
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