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post #1 of 7 Old 08-20-2008 Thread Starter
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Pickling A Gas Tank

The gas tank in my Atomic 4 powered C-27 was giving me problems with sediment. I've since installed a 5 gal plastic tank in the aft lazerette for safety. If the tank leaks, the gas drains overboard instead of pouring into the bilge. I've drained and cleaned the internal steel tank. What can I use to pickle the tank and prevent corrosion? Deisel attracts water and gas defeats the purpose. Any thoughts?

Mike Youngling
Kaneohe Bay, Hawaii
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post #2 of 7 Old 08-20-2008
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Why don't you use fogging oil, since it is basically forumlated to stick to metal surfaces and protect them from corrosion.

FYI, having your gas tank setup so that it drains overboard in the case of a gas leak or spill is probably illegal. The MARPOL convention states that overboard discharge of petroleum based products is illegal and the USCG and EPA can hit you for big fines if it happens. A placard for the law, as required on boats over 26' LOA, like yours, says:





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The gas tank in my Atomic 4 powered C-27 was giving me problems with sediment. I've since installed a 5 gal plastic tank in the aft lazerette for safety. If the tank leaks, the gas drains overboard instead of pouring into the bilge. I've drained and cleaned the internal steel tank. What can I use to pickle the tank and prevent corrosion? Deisel attracts water and gas defeats the purpose. Any thoughts?

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post #3 of 7 Old 08-20-2008
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Cell,

A few years ago, my dad and I restored a 1942 Willy's Army Jeep. The original gas tank was shot so I welded up another out of steel at work. I took the tank to the local gas tank repair guy who put this red goo inside the tank and sloshed it around and around the tank is now coated with this stuff and it has lasted.

1988 Seaward Fox
no name yet (it's in pieces!)
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post #4 of 7 Old 08-20-2008
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post #5 of 7 Old 08-20-2008
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POR15 makes a gas tank repair kit too.

"http://www.por15.com/prodinfo.asp?number=FTRK"

"Figment" 1978 Pearson 30 #1083

Last edited by ereuter; 08-20-2008 at 07:07 PM.
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post #6 of 7 Old 08-20-2008 Thread Starter
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Thanks Guys!

I know what a discharge placard is Saildog,
What's the difference (in a catastrophic leak) between fuel draining out the boat through a drain hole and fuel being pumped out of the bilge
(except for the potential explosion from the pump kicking on)? Either way your going to have to face the music with the Coast Guard.

Mike Youngling
Kaneohe Bay, Hawaii
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Mike, the difference between draining overboard and into the bilge, is that at least you get a second chance to catch the spill before it gets out of the bilge. The volatiles from the gasoline may evaporate (from a small or slow spill) and leave just the less explosive portions--which can be absorbed and disposed of.

But, why is anyone talking about tank sealants and pickling when you've installed a PLASTIC tank? Plastic doesn't rust, it doesn't form crud, it doesn't need pickling.

If you are keeping the gasoline for more than 90 days, that does break down and you need to add "stabilant" to the gasoline. The stabilant prevents some of the normal varnishes from forming and compensates for the more volatile compounds (heptane and butane) that normally evaporate from the gasoline.

Use stabilant, keep the tank topped up, and shut both the supply and vent lines when the boat is not in use. You won't need to do anything else. Although I'd still use a filter funnel, baja filter, etc. when fueling up--might as well stop the crud from coming INTO the boat in the first place.
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