Our proprietary Hawaii Fueling Network (HFN) Fueling Card is accepted at over 20 HFN fueling cardlock fueling locations and O ... hana Fuels retail stations on the islands of Maui and Hawaii. With no annual fees or membership dues, our programs are designed for both businesses and individuals with 7 days a week access at all sites, and 24 hours a day access at all HFN fueling cardlock stations. read more