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besides draining the whole fuel tank -- the next best thing to do is to drain out the fuel filter completely and re-install,AND then go to your local auto parts store and buy some stuff call 'HEAT' ( this is a gas additive that removes water that may be in the tank ) and add this to the tank,, don't worry about the the correct amount to add ( fuel to heat ratio ) -- just pour the whole little bottle into the tank. now while you are at the parts store -- also pick up a 'octane booster' ( like 'Octane101' or something similar ) and add this to your tank along with the 'Heat'. between the two this will help curve the bad fuel. now since bad fuel does not burn very clean it is also a good idea to remove,check and clean your spark plugs,, if they look kinda on the so-so side, replace them with new ones,, this will ensure that you have good spark ( which is very important !! ).
now this has happened to me twice and to a few of my friends -- AND I would call the gas station that you got the fuel from and tell them that you got bad gas there,, I have actually got one of them to pay for the fuel clean out chemicals that I had to buy to fix the problem.
IF you want it done 100% correctly,, you can drain the fuel tank completely and start with new fuel,, but if you have a FULL tank - this could be kinda a big pain.. the best way to drain the tank would be to disconnect the fuel pump DELIVERY side line and just let the fuel pump pump the fuel from the tank into small gas cans,( you will need to buy a small hose to attach to the fuel pump to feed into the small gas tanks ),,, and then start with new fuel,, remember to drain out the fuel filter and check and clean the spark plugs.
if you need anymore help, please feel free to write me back here and I will do my best to walk you through the steps needed.
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