Cleaning old gas tank

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snookstalker
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Cleaning old gas tank

Postby snookstalker » Sat Oct 24, 2015 11:06 pm

Have an old small outboard that has been sitting with fuel in the tank for 10 years. Obviously there was only a 1/4 tank of the "fuel" left and a lot of varnish/sludge dried up in the tank. Any suggestions on something to soak in there to help get it cleaned out?

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GCRedfisher
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Re: Cleaning old gas tank

Postby GCRedfisher » Sat Oct 24, 2015 11:48 pm

White Vinegar, soak it for a few days, sloshing it every once in a while, once clean neutralize with baking soda, Attwood and Moeller sell new, plastic, non rusting tanks for less than 50 bucks in the small sizes. I've used Brake Cleaner or Carb Cleaner and and bunch of BBs too but the Vinegar works better, just takes longer.
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RK
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Re: Cleaning old gas tank

Postby RK » Sun Oct 25, 2015 12:34 pm

alcohol, have done it many times.

scrambletown
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Re: Cleaning old gas tank

Postby scrambletown » Sun Oct 25, 2015 4:24 pm

took mine to a radiator repair place had it boiled out and sealed.
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SWAMPHUNTER45
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Re: Cleaning old gas tank

Postby SWAMPHUNTER45 » Mon Oct 26, 2015 9:45 am

I have seen a few of those antique OMC dual line tanks restored over the years. Not sure just how bad yours is or if it has any rust.
Several of the earlier suggestions should prove helpful to remove varnish and sludge. The use of bulk carb cleaner is also a viable option. Pour in a quart and keep sloshing it around. It can even be reused on an other project.

In those vintage tanks the KREEM epoxy tank coating kit worked really well.

http://kreem.com/fueltankliner.html

snookstalker
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Re: Cleaning old gas tank

Postby snookstalker » Mon Oct 26, 2015 12:10 pm

Got it filled with vinegar now. I'll post the results to let everyone know how that works out.

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Comanche-pup
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Re: Cleaning old gas tank

Postby Comanche-pup » Mon Oct 26, 2015 4:02 pm

They also make a coating that when you get it cleaned, you dump the coating in and it sloshes around to coat the inside so more stuff dont flake off anymore, I forgot what it is call but I used it in a tractor several years ago


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SWAMPHUNTER45
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Re: Cleaning old gas tank

Postby SWAMPHUNTER45 » Mon Oct 26, 2015 4:43 pm

KREEM

The kit cleans and etches then puts an epoxy lining both seal and coat the raw metal surface.

Been around over 20 years works very good

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Comanche-pup
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Re: Cleaning old gas tank

Postby Comanche-pup » Mon Oct 26, 2015 7:38 pm

Thats it! Thanks for the memory boost swamp!


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Brotherbob
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Re: Cleaning old gas tank

Postby Brotherbob » Sun Nov 01, 2015 5:57 pm

Drop some chain in it or nuts and bolts , fill with clean diesel. Then strap it to your tractor tire and go mow! When your done fish out the chain , drain the tank and Wah=Laa clean tank!
Yeah I know I'm a redneck but it works.
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snookstalker
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Re: Cleaning old gas tank

Postby snookstalker » Wed Nov 04, 2015 6:09 pm

Update:
Filled with white vinegar as GCRedfisher suggested, gave it a few days, then rinsed and repeated. It was so caked up there were chunks an inch thick that I had to break up to get them out the filler hole!
After 2 soakings and about 10 days, I'm happy to report that the inside of the tank is absolutely spotless and shiny as a new penny!!
Way cheaper than than carb cleaner! I imagine the carb is probably gunked up as well. If so, it is gonna get a vinegar bath as too!

Thanks GCRedfisher!!!

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GCRedfisher
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Re: Cleaning old gas tank

Postby GCRedfisher » Wed Nov 04, 2015 6:17 pm

Glad to help! It is amazing how well it works if you have the patience. Works well with just about anything gunned up. I've also boiled carbs in a 50/50 mix of lemon juice and water, just remove plastic parts and do it outside if possible. When it comes to making due on the cheap, I'm your man!
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