it is a single tank, shaped as a saddle for a horse, as it is going over the drive shaft in the center of the car - once the fuel level is below the hump, the passive siphoning "pump" will transfer fuel from the left half of the tank to the right half, where the actual pick up happens...

I would suggest buying the INPA software suite along with the cable... since your car is a 2001 model, you also need to check under the hood to see if you have a circular data port - on the newer models the OBD II connector next to your left knee took over the data port functions... if you have the data port, than you need to buy an additional adapter for it.

i do not know if you can buy things off the ebay, but if you do, please search on ebay for INPA, there is a dude from Romania who is selling the cable and everything that you need for the laptop... check, to see if he will ship to philippines... a lot of folks on this forum are using his product