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.
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, Ducati 250 bevel, Benelli 250, Benelli 360, Honda CB350T, and many more.