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  Bad Gasoline....symptoms?

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Author Topic:   Bad Gasoline....symptoms?
FXSTB posted 06-18-2003 12:16 PM ET (US)   Profile for FXSTB   Send Email to FXSTB  
My 82 Outrage with a 97 Evinrude 150hp seems to have bad gas. The engine is hard to start and idles poorly, especially when cold. At 1000 rpm+ is runs fine. At idle it cuts out so bad that it quits. The gas has been in the tank for about 6 months and has fuel conditioner in it. Any thoughts?
where2 posted 06-18-2003 12:58 PM ET (US)     Profile for where2  Send Email to where2     
crud in low speed (idle) jets. Run a portable tank with 3 gallons of gas, proper oil mixture, and a bottle of Chevron Techron in it. Run the engine for 5 minutes, then shut it off. Go back on Friday night, and start it back up after the techron and fresh gas has sat in the bowls loosening the goo for a few nights.

Otherwise, disassemble carbs, clean, and reassemble. (which is the method I like, because I can run it later that day and know what I got for my time wasted...) I'm also more assured that I have the crud out, rather than leaning out a cylinder...

nevada posted 06-18-2003 01:01 PM ET (US)     Profile for nevada  Send Email to nevada     
Smell it. If it is bad you'll know. It will have an unmistakabe varnish smell. It tastes prety bad too. Be more carefull than I when siphoning it.

Joe

Tom2697 posted 06-18-2003 02:32 PM ET (US)     Profile for Tom2697  Send Email to Tom2697     
The easiest method to check for bad gas is to run your motor off a small, portable tank. If the problem goes away, you know the cause. If it doesn't, you will need to clean the carbs or injectors and you may still have bad gas. Depending upon the amount of bad fuel in your tank, drain it (best method) or dilute bad with good (if only have a small amount of bad. Performance will suffer until bad gas is completely gone but no harm should occur.
FXSTB posted 06-18-2003 04:05 PM ET (US)     Profile for FXSTB  Send Email to FXSTB     
Thanks for the suggestions and observations. I took the carbs off last Saturday, disassembled and cleaned. Then I drained the 25+ gallons out of the tank and put it in a work truck. I haven't put new gas in it yet, but I anticiptate that all will be fine when I do.

PS This ordeal started a couple of weeks ago when the engine would not run enough RPMs to get the boat planed off!!! The solution to that problem was a dirty fuel screen in the fuel pump. I have since added an in line filter and will periodically check the screen. By the way, the carbs were clean!

j_h_nimrod posted 06-18-2003 08:52 PM ET (US)     Profile for j_h_nimrod  Send Email to j_h_nimrod     
Bad gas is used as a catch-all for just about any mysterious motor related problem... We run a 2000 90hp Ficht out at our remote camp with gas that was sent out in June 2001 (probably put on the barge in late May 2001). The motor has had problems, but not a single one was related to bad gas. Granted the gas is in sealed drums and is not mixed. The only time we use fuel stabilizer is when we leave for the winter, and then we only put it in the drum we are using then and in our jugs of mixed gas. We also use the same gas in a '95 88spl, two '93 25hp Evinrudes, a Honda 650 generator, chainsaws, etc... The only gas related problems are water in the fuel which is pretty common up here anyway.

Just my experience. I imagine gas looses octane faster at higher tempertures, does anyone know for sure? Average temp. here is probably between 45f and 50f.

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