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Antique Gas Engine Discussion

Varnished Gas Removal


I have an engine that runs great with fresh gas...But after the fresh gas sits in the fuel tank for...

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  #1  
Old 05-07-2007, 07:20 AM
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Default Varnished Gas Removal

I have an engine that runs great with fresh gas...But after the fresh gas sits in the fuel tank for around a week the fuel gets a varnished smell to it and the engine is harder to start unless i drain the fuel out and put fresh in. Is there a chemical around that will remove all the left over varnish. This engine had not run in about 8 years when i got it. I removed the tank and put rocks into the tank and cleaned it..But it still varnishes the new fuel when you put more in.
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Old 05-07-2007, 07:24 AM
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Default Re: Varnished Gas

I use acetone to clean it out & Ozark Trails(Wal-Mart) camp fuel with 3/4 ounce of Marvel Mystery oil added per gallon for running.
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Old 05-07-2007, 07:36 AM
Ned L Ned L is offline
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Default Re: Varnished Gas

I've found that carburetor cleaner works better than anything else I've tried for dissolving varnish. I buy the Wal-Mart brand, which is about $1.00 for a spray can. I spray a good bit of it into the gas tank, slosh it aground and let it sit (cover the openings to keep it from evaporating). That worked to clean about a quart of tar consistence varnish out of a tank I had (the stuff was so thick I actually had to heat the tank with a torch to get the first pint & a half to drool out like molasses in February).
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Old 05-07-2007, 09:41 AM
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Default Re: Varnished Gas

Try using paint stripper,rinse with acetone or water. Works for me...

Last show of the season drain gas out of all your fuel tanks. Next show season your good to go.

Coleman lantern fuel works good but is to expensive for me to run especially if you have more then a couple engines. However I do run coleman fuel in the model engines.
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Old 05-07-2007, 11:14 AM
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Default Re: Varnished Gas

Acetone works for me. Where are you guys finding the Marvel Mystery Oil and what makes it so special compared to 2 cycle oil. Yeah, I know, it's a mystery.
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Old 05-07-2007, 11:46 AM
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Default Re: Varnished gas removal

you can find Marvel Mystery Oil at about any hardware store. I get mine at a small mom and pop hardware store here in town...
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Old 05-07-2007, 12:00 PM
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Default Re: Varnished gas removal

Wal-Mart has MM oil in the automotive section. Best thing I have used for varnish removal is Berryman's B-12 Chemtool. Most places sell it in an aerosol can, but Wal-Mart is one of the few places I've been able to find it in liquid form. It will be right next to all of the other carburetor cleaners in a metal cone top can. Sea Foam would probably work too, but it costs twice as much per pint.
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Old 05-07-2007, 01:55 PM
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Default Re: Varnished gas removal

NAPA carries MMO! They always seem to have it on the shelf with other "addetives" and it really is a "Marvel" with the situations it can be applied too! Almost as handy as the rust busting products!
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Old 05-07-2007, 02:21 PM
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Default Re: Varnished gas removal

I use StaBil Fuel Stabilizer in my tractors which don't run nearly often enough.......
I try to keep the fuel level low enough so I can top them off with some new gas once a year but StaBil makes all the difference in the world and does not allow varnishing to occur.
The new stuff being called "gasoline" after a couple weeks smells about 2 years old but StaBil keeps it fresh smelling even a year later.
Follow the directions.......more is not better.......
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Old 05-07-2007, 05:32 PM
Ed Radtke Ed Radtke is offline
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Default Re: Varnished gas removal

denatured alcohol works instantly.
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Old 05-07-2007, 07:45 PM
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Default Re: Varnished gas removal

Agree, acetone kicks butt! In a pinch laquer thinner works well. Have plenty of ventilation with the acetone like a fan or good breeze! Will have to try the denatured alchohol trick. I have found the Briggs stabilizer is much better and stores much longer.
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Old 05-07-2007, 08:37 PM
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Default Re: Varnished gas removal

Marvel Mystery oil can be bought at about any automotive or hardware store. Has a nice red color and a pleasent smell. I also use it straight in my oiler for my cylinder on my Titan. Looks nice in a oiler because of the red color. Advantage is it burns pretty well. If you like the 2 cycle engine oil thats good to. It just helps to keep from gumming up valves and slows down deposits of unburnt oil in cylinder.
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Old 05-07-2007, 10:35 PM
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Default Re: Varnished gas removal

I like good old MM and also Rislone is a great choice thats been around ages.
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Old 05-08-2007, 04:58 AM
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Default Re: Varnished gas removal

I found out the hard way that E85 Ethanol fuel will remove any crud from the whole system and leave it deposited in the carburetor it seems that that force for evil could be used for good to flush out the tank, checkvalve and lines. No kidding, after cleaning out the loose stuff left by the ethanol, the inside of the tank looks fresh metal.

Bill
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Old 05-10-2007, 04:22 PM
ColoScott ColoScott is offline
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Default Re: Varnished gas removal

This stuff from yamaha works wonders. I've used it to clean fuel tanks, carbs, fuel lines, etc...!!

"Yamaha Carburetor Cleaner is excellent for the removal of stale fuel residues in all carbuetors. Blended specifically for all Yamaha models."

Try it.

http://www.parkeryamaha.com/browsepr...er-32-oz..HTML
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