Fuma was born in Moca, on the island of Bioko. He studied law and political science at the University of Madrid and later worked as a lawyer and journalist. In 1979, he was appointed as the Minister of Foreign Affairs by President Francisco Macías Nguema. After the overthrow of Macías Nguema in 1979, Fuma continued to serve as the Minister of Foreign Affairs under President Teodoro Obiang Nguema Mbasogo.
In 1982, Fuma was appointed as the Prime Minister of Equatorial Guinea. He held this position for ten years, until 1992 when he was replaced by Silvestre Siale Bileka. During his tenure as Prime Minister, Fuma oversaw the implementation of economic and political reforms, including the introduction of a new constitution in 1982.
After leaving the government, Fuma remained active in politics and served as the Secretary-General of the PDGE from 1992 to 1996. He is considered to be one of the most influential politicians in Equatorial Guinea and is known for his strong support of President Obiang Nguema.