I got my ol lady an M600 a little over a year ago and I have an S4RS for myself, she swears the S4 tank is huge compared to her 600. I'm not positive if there is a difference but she is. I'm too lazy to head to the shed to measure them. I'd think you could use the electric fuel pump if you tracked down a power source that is live when the bike is turned on. Rear running light comes to mind.
09 Aprilia RS125 plated
06 Paul Smart Sport Classic NFS ever.
08 S4RS Tricolore #081 NFS ever.
01 M600, aka, The Pink Monster
97 900SS CR
72 Norton Commando 750
03 KX60 with S4R rear shock,Honda CB350F, Hodaka Ace90, 3x Yam-YGS1, Yam-CS3 200, Vespa small frame, Gilera 106, Puch Sabre, Puch 50 Boy Racer, Benelli 250, Benelli 360, Honda CB350T, and many more.