I have a 1982 Alfa Spider Veloce, which suffer fuel pump failure back in the 90s when I lived in Ohio. A friend who was a Maserati master mechanic and was connected to Bosch factory guy, discovered after three fuel pumps, drained and cleaned tank, new fuel filter (and one added pre and post pump) that the issue stemmed from additives in the winter-formulated fuel (petroleum naphtha). The naphtha was eating the seals, as the pump uses the fuel as the lubricate. Procured a Bosch pump with asbestos seals, and the car has been running smoothly for over 25 years, still purring along, regardless of the fuel formulation. Good luck.