Drain gas if car's been sitting?

A month after my last post, and I'm finally ready to get my '99 Cobra 'Vert fixed. She's been sitting in my garage since May, waiting for me to save up enough to fix her - popular opinion is that my throwout bearing and clutch are bad.

I finally have the money I need, and plan on taking her in next week (YAY!), but a friend of mine told me that since the car's been sitting for so long, I need to empty the fuel tank, drain the lines, and run a cleaner or something, because old gas is bad for the engine. But so far, a lot of stuff he's told me about cars has not been right, so I don't know if I should believe this. And I don't want to ask the guys at my Mustang shop on the chance that they'll say yes, just to make some money. I don't think they'd do that, but I'll forever be mistrustful of auto mechanics

SO...do I need to have the tank drained/lines flushed? It's 3/4 full and has been sitting since the middle of May. I started and ran it for a few minutes once in the middle of July, but since then, nothing.

Thanks!!

Thanks guys!! I'll try to top it off on the way to the repair shop....I guess it kind of depends on how it drives over there...I may not want to stop if it's too bad, but I've been told it should be okay, so we'll see.

If I don't do it before, it'll be immediately after she's fixed, and I'm already planning a nice long drive afterward....after four months of driving only a 12 year old Honda Civic, I'm going through withdrawals! I miss driving a REAL car! Haha...

And I'll get some SeaFoam, too....and a fuel filter