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Old 09-11-2015, 06:53 PM   #21
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If you do, close the crossover shutoff valves to prevent the other tank's pressures and vents from affecting your operation.
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Old 09-23-2015, 10:41 PM   #22
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UPDATE.

Thanks to all that helped me with this. I installed the shut-off valves on each tank today. Each tank holds 300 gallons and I had about 80 gallons in each tank.

I first taped off the vent and closed all the valves. I have this cheapo shopvac that I use mainly to dewater hard to get at places on the boat such as when I change the engine pencil zincs. A helper put the vacuum nozzle down the fuel fill fitting and wrapped a rag around it to seal it off. We turn it on for about 3- 4 minutes and I removed the plug on the fitting. What I observed is that as the plug was loosen I could hear air rushing into the tank from around the fitting. I removed the fitting and not a drop of diesel come out, not a drop.

Installing the new shut-off valve was a simple matter after I have spent days stressing over this. Thanks again.
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Old 09-23-2015, 10:45 PM   #23
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WTG!! I was wondering how this turned out, Ron. Kudos to you and crew.

Great info for future reference.
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Old 09-23-2015, 10:47 PM   #24
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I love a great idea properly executed!!


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Old 09-23-2015, 10:57 PM   #25
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Awesome!!
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