I will have burnt salvaged gas in my vehicles many times. As the others have added, use some common sense and look at and smell it. if in doubt don't use it.
Here are a few tips I can provide that have served me well enough in the past.
I normally pick up the clear kind of rubbing alcohol (~90%) anywhere cheap ( around a $1 or so per 20 oz bottle) and dump some in to eat the water and give it a bit of a boost. All "heat" or "octane boost" type products mostly are alcohol (methanol). I have found about an 1/4to 1/2 oz / gallon works wonders for old gas and puts some pep back into it. Helps avoid some of the issues of using salvaged gas. If you have a mostly aluminum engine I suggest cutting back to a couple cap fulls. Adding too much can burn up parts and cause premature failure if done often. It does not seem to cause any damage to iron engines.
As someone else stated above the best way to deal with pumping it out is to use the pump itself and run it through the filter. A few minutes looking up the wiring for the pump to find the positive and ground is all it takes with a nice long set of jumper cables. (Connect to pump wires and then the battery. Don't need sparks flying.) Try to do this without dropping / removing the tank when possible. You don't want to stir up the sediment on the bottom of the tank if it can be helped.
Hope that helps.
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