I've heard that as well...I'm sure I really shouldn't be running mine down to the light with a Walbro every tank. I just like the feeling of getting a fresh full tank of gas LOL.
I think even subaru says not to get into boost once the gas light comes on, so I'm sure we shouldn't be running it that low. I'm actually suprised I haven't had any fueling problems with a near empty tank and a walbro. My best friends drag car runs a GSS342 and runs into major fuel pressure problems below 1/4 tank.