There are a few regular fuel stations in Timor. For example there is Tiger Fuel in Dili and a station near the Baucau airport on the west side of Baucau. At these stations, you may fill your vehicle for about $0.94 / L. Do not expect credit cards to work, so be prepared with cash. Outside of these places, gas / diesel / petrol (or what ever you call it) will usually only be available from small roadside stands. Just look for the houses or small stores that have a line of clear plastic bottles on display with fuel. Or sometimes there may be a larger barrel with a hand pump. When pouring into the tank, they will use the measured amount and screen through a small filter to avoid contamination. (http://www.virtualtourist.com/travel/Asia/East_Timor/Transportation-East_Timor-MISC-BR-1.html)