Pull the tank and dump it out? Maybe you could un hook the lines from the top of the tank and hook up a new line to it and use the fuel pump to empty it. That or buy a fluid evaluator. I have a mighty vac brand one that i use at work and its pretty decent.
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So i had my tank out in about 20 mins, when i made up some rock protection/sliders. The lines will unclip after you slide the rubber gromet towards the tank or away from the rubber line. Just move it back and squeeze the two tabs inward. Then remove the plastic cover that wraps around it and remove the strap bolts that holds the tank down. Wish you the best of luck and let every one know if it wasnt just bad fuel. Lots of knowledge on this site. Some one will have an answer to your question or concern.
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My Pioneer was a Texas flood victim when I got it complete submersion everything had water in it, I was to lazy to pull the fuel tank I just turned the metal ring that holds the pump down and lifted it out and pumped all the fuel out and dried it up with a towel.