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Old 09-10-2017, 03:36 AM   #21
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City: Seattle
Vessel Name: AZZURRA
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I don't know the answer. I just know it's irrelevant to me. I always keep the boat full. You can fill empty tanks but you really can't empty full ones.
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Old 09-10-2017, 08:56 AM   #22
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City: Cruising East Coast US
Vessel Name: Grace
Vessel Model: DeFever 48
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Full tanks always improve stability and decrease strain on lines. It is the quick snap of velocity on lines that causes problems. The same is true for anchoring. You'll notice it's almost always the smallest boat in an anchorage that drag. The boat bounces more with less weight and pulls out the anchor. A heavier boat is also easier to dock as the motions are slower and more predictable dockside.
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Old 09-10-2017, 10:06 AM   #23
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There is an other consideration. If you leave the tanks half full the fuel will slosh around in a bad storm and mix any junk on the bottom of the tank into the fuel, which could make moving the boat after the storm interesting. Full tanks don't slosh. Of course you can compensate for the lighter weight of the half full tanks with the weight of all the fuel filters you are likely to need after the storm.
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Old 09-10-2017, 01:12 PM   #24
City: New Orleans
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I have 1,000 gals capacity diesel tanks, 300 gals fresh water. Fuel tanks are half full. Very expensive to fill up plus I spent time securing the boat rather than running to the fuel dock and back. I did fill the fw tanks before I left though.
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Old 09-10-2017, 02:46 PM   #25
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IMO - All tanks 1/2 full. That's if you feel fuel tanks have at least fairly clean bottoms and sides
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Old 09-11-2017, 05:43 AM   #26
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Originally Posted by Art View Post
IMO - All tanks 1/2 full. That's if you feel fuel tanks have at least fairly clean bottoms and sides


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