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Old 03-27-2023, 10:19 AM   #13
syjos
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City: Gig Harbor
Vessel Name: Sandpiper
Vessel Model: Bluewater 40 Pilothouse Trawler
Join Date: Nov 2012
Posts: 2,315
Sandpiper has 2 X 300 gallon steel fuel tanks in the engine room. It is moored in the PNW.

I've not filled the tanks full in 20+ years, usually put in around 400 gallons every spring. I leave minimal fuel in the tanks (15 to100 gallons) through fall, winter and spring and maintain a 50 degree engine room temperature. Less fuel allows easier fuel polishing and constant temperature reduces fuel tank breathing. Sandpipers fuel tanks have sumps where the fuel is drawn. From the sumps, the fuel is routed to Racor 500's, then the engine and generator.

I test for water every month during winter with a dip stick and KolorKut and polish the fuel right before spring.

I have never detected water in the fuel in 23 years.
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