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Old 06-28-2014, 05:12 PM   #1
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Fuel system vac gauges

I bought a couple of vac gauges that have inches of mercury scale. Can anyone tell me a reasonable reading where I should change the filters? I have Dahl filter / water separators, than you
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Old 06-28-2014, 05:21 PM   #2
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FWIW, as I recall on the Racor gauges they start going into the red at 10 inches of mercury.
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Old 06-28-2014, 05:44 PM   #3
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Thanks Bill, I hope to avoid running till they plug to find out, I normally change at 100 to 120 hours. The boat I delivered had them and they worked very well, after some rough water on Huron one gauge started climbing and 3 days later the engine (DD 8v71) started to loose power. I didn't pay close enough attention to the gauge reading at the time and I did notice that even when not running the gauges maintained their reading.
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Old 06-28-2014, 07:00 PM   #4
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Ron, I think you will find using vacuum gauges that you will change fuel filters less often. I did change filters on a regular schedule, but now change far less often. My gauges have a "following" needle that stays at the highest point registered. They are super great to have.

Here are the gauges I have. Home

If you like them, contact Capt Tim there. He also owns Florida Marine Diesel Service, and services my boat. No affliation, but if Tim does it, it will be right.
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