You don't say how old the gas is. If it's turned to shelac make sure you dispose of it properly. If it's just old, mix it with new gas and use it in your lawnmower.
You can use an electric pump if it says it's safe for transfering gasoline. Stick the pickup hose down into the tank. If you hook the pickup hose to your bulb you run the risk of leaving some of the old gas behind. Most tanks are built with the pickup just slightly higher than the bottom of the tank to avoid picking up any sediment or water that may condense in there. You want to get as much of the old gas, water, shelac, dirt, etc. as possible, and that means going to the bottom of the tank.
After you pump it make sure to put in a new fuel/water filter before you start your engine to collect any crud that may have been missed. The last thing you want is for that junk to get into the carbs.
Red skys at night..
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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