The Mas Control Unit (89-93models) Incorperates The Fuel Pump Relay Or So I Have Been Told. I Think My Fuel Pump Is Ok . I Can Here The Pump Ingage When I Turn The Key On. But That May Just Be It Priming The System And Then The Mas Control Unit Takes Over , I Don"t Know. I Have Not Been Able To Crank The Car Up In A Month Or So With The Exception Of Three Timmes. Twice When I Was Trying To Figure Out What Might Be Wrong And It Just Turned Over And Once When I Jumped The Fuel Pump Relay With A Piece Of Wire Between The Fuel Pump Relay Plugs. All Three Times It Went Back To Not Starting Again.