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Old 10-03-2014, 09:00 PM   #1
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Gas Tank External Drain- -Need Suggestions?

In 2 weeks I will drop my fuel tank to replace the fuel pump that has been acting up. While I have it out, I am thinking about installing an external valve to drain the tank if needed in the future. Dealing with today’s ethanol mixture, when the fuel is getting old in the motorhome, I could drain some of it and use it in my daily auto. This way, I could refill the motorhome with fresher fuel before it gets too bad/old.

1. What do you think about this idea?
2. If this is doable, What valve or drain do you recommend?
3. Not wanting to weld on the fuel tank as it is too dangerous, What adhesive material do I use to adhere the plate with the valve to the tank?

Thanks in Advance for your help and suggestions.
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Old 10-03-2014, 10:08 PM   #2
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I'd tap off the fuel line, either the main or the generator. If you 'T' off the main pick up, you could install an auxiliary switch to use the submerged fuel pump as a way to pump out the tank. Just hide the new plumbing and fuel pump switch, no point making it easy for the neighborhood teens to fill their tank!
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Old 10-03-2014, 10:09 PM   #3
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If you're dropping the tank, why not weld. Fill with water, drain it down and weld away.

Had a friend that wanted a larger tank on his Blazer so cut the tank in half, added about five inches all the way around and welded it back. Poured some tank sealer in it, rolled it around to coat the interior and let everything dry. No leaks and a lot more range (which we needed in Alaska).
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Old 10-04-2014, 08:40 AM   #4
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Just tee off the main fuel line. But if you use fuel refill it right away as you will get condensation if you don't. Stabil or another product will help with storage fuel.

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Old 10-10-2014, 06:21 PM   #5
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After reading all the suggestions, I decided when I install the fuel tank I will reroute the genset fuel line with a T connected to a 12V external fuel pump. The one I am looking at will pump 30 GPH which will solve my problem. I won’t be using this system often, just when the fuel is getting older than I desire if I don’t travel much in a 3-4 month period. Thanks to all for your assistance and suggestions.
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Old 10-10-2014, 06:37 PM   #6
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Of course you know that tapping the genset pick up will only access the top 3/4 of the tank, leaving a 1/4 tank of gas and 3/4 air to allow condensation to develop. In addition, if you tap into the main engine pick up, not only can you drain the tank more fully but no need for an auxiliary pump, just energize the submerged fuel pump when you want to drain the tank.
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