HOW DO I FIT A UPGRADED FUEL PUMP TO MY SUBARU 1995 STI AS IAM NEW TO OWNING A SUBARU

 

not sure on a classic but on my newage it is under a metal plate in boot on o/s,a couple of pipes to undo,a wiring plug to remove and then a ring of 8mm head bolts it will all lift out then.
once out seperate pump from gauge sender and swap over