In 2004, there was a famous self-refueling accident caused by electrostatic discharge (ESD) in America, California, and it reminds people the potential risk of self service gas station. Taiwan has more than 247 self service systems and it will continue increasing, so we should take care about this issue. Therefore, to explore the ESD hazard and its related prevention measures on self-refueling operation will be the key issue in Taiwan, and this is also the purpose of this study.

We cooperated with 15 gas stations to collect some information, and to explore the most common methods used for electrostatic hazard prevention in self service gas station in Taiwan, then to measure the electrostatic condition on necessary area when refueling.

According our research, we found the electric resistance of gasoline is very high, the average value is 0.04 pS/m (0.04±0.05 pS/m). We also test some electrostatic prevention methods, such as: 1. removed the billet from gasoline pump nozzle, and customers would not jam the pump nozzle and touch other area when they refueling; 2. ESD eliminating bottom, or conductive operation keyboard (discharge time：0.30±0.12 second), keep them could conducting the charge which stay on person; 3. gasoline pump nozzle and operation relative pipe with metal materials, and we test grounding resistance of gasoline dispenser, periodically; 4. removed the plastic sheath from handle, to increase the conductivity (plastic sheath resistance：＞1012 Ω; removed plastic resistance：2 Ω). Those methods also exhibited a good effect of ESD prevention at the good maintenance condition. Besides, the method of hang a piece of cloth on nozzle may produce more electrostatic charge, and make a potential risk.

Base on the study results, we give some suggestion to self-refueling operation. We hope the suggestion can effectively minimize the risk of ESD hazard on gas station.