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Have a look at this youtube clip. Pretty good straight forward instructions, did both of mine in under 20 mins each.
"Pipe Dream"2002 Rinker 342 Fiesta Vee2 x 350 MAG MPI Horizon Petrol
Correct, work the adjuster to get the belt off and that should give you the room needed to get the pump removed.
Dream 'Inn III -- 2008 400 Express