Google the part number. Also check ebay but use the term Johnson or Evinrude fuel pump. Someone has parted one of them. Often there are boat salvage yards.
Alzi, I own a marine engineering company over in Dunoon. We are agents for Mercury/Mariner but we always swear by Alex for omc spares and he's been around them so long there's nothing he couldn't help you with. Glad you're on the water again. Peter