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Old 05-23-2009, 06:38 AM   #1
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Default how to tell if nitro fuel is bad?

hye guys, how do you tell if nitro fuel is bad?? i have a full gallon i only used about 3 tanks out a about a year ago, its been sitting in a box in my shed , i just found the fuel , and it still burns and does leave an oil mark like myu brand new fuel, but it does seem to burn longer about 10-15 seconds longer, and they are both 20% nitro....
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Old 05-23-2009, 08:03 AM   #2
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hye guys, how do you tell if nitro fuel is bad?? i have a full gallon i only used about 3 tanks out a about a year ago, its been sitting in a box in my shed , i just found the fuel , and it still burns and does leave an oil mark like myu brand new fuel, but it does seem to burn longer about 10-15 seconds longer, and they are both 20% nitro....
usually it does not go bad. the nitro percent changes if you leave the bottle with open.
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Old 05-23-2009, 09:09 AM   #3
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If fuel gets too much moisture in it the motor will do strange things. Usually it will act like it's rich but run hot. This is what usually happens to me anyway. However, I was trying to help tune a guys TMax once and it had a bad lean hesitation but would not richen up. Since he had just bought the fuel and wasn't acting like a normal bad fuel symptom we instead tried everything else. We cleaned the carb, checked the tank for blockages, etc but nothing worked. Finally I put a tank of my own fuel in it and problem solved.

Basically, if you can't get the thing to tune right, switch fuel and try again.
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Old 05-23-2009, 09:48 AM   #4
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Another problem with fuel is the nitromethane will leech out. This is especially true if you left it on a concrete surface.

Racers have told me that if the fuel is more than 6 months old, it's no good.
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Old 05-23-2009, 09:57 AM   #5
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Another problem with fuel is the nitromethane will leech out. This is especially true if you left it on a concrete surface.

Racers have told me that if the fuel is more than 6 months old, it's no good.

sorry I cant agree with that , because some shops have their fuel sitting for months before they are sold. that would make all fuel obsolete.
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Old 05-23-2009, 11:08 AM   #6
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It depends on the bottle. Some companies use excellent bottles and the fuel can last for years if properly stored. Other bottles are terrible and the fuel can go bad very quickly.
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Old 05-23-2009, 10:55 PM   #7
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If your nitro is still as clear as the day you bought it, then 99% of the time its fine. If you see globs of gel or uneven coloring then the fuel has started to varnish and is no good anymore. Before you move it too much, check to see if anything has separated to the bottom. If so, chances are still good the fuel is Ok, but I would try to avoid using that fuel in the bottom.
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Old 05-24-2009, 11:53 PM   #8
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Interesting thread. I left my car sitting in the garage with fuel in the tank for almost a month. The fuel turn orange it was a bitch to start... When I finally realized the fuel might be bad, I drained it and put some fresh nitro and it started right now. Check the photo below and lets see if you can spot the bad fuel :-)

h t t p://home.comcast.net/~lecstudios/pictures/badnitro.jpg
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