$576 for a fuel pump is amazing

Is that just to increase the reliability of the bike? I know people were saying an external pump would make more aftermarket tanks. I'm curious what model of bike would have a tank that would fit. I was looking into having an aluminum tank made up for my bike as the 1.9 gal goes quick. One more gallon for 250 bucks is kind of steep

Dead-on the money...you won't find very many blow-molded parts that don't have it.

The 2010 Dakar Husky is a 450 EFI bike w/ a KTM 640 Adventure tank. They managed to fir and external fuel pump and filter for the rally.

Have a look here for details:
http://www.cafehusky.com/forums/showthread.php?t=7255

I'm trying to get the guy to tell me what fuel pump they used!

So I asked him what fuel pump and pressure regulator he ran external to the tank.

Response:

The fuel pump is a Walbro heavy duty designed for this purpose. The regulator is a Bosch put into the throttle body. This is an open circuit in order to keep cold the fuel pump.