2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 151Get this manual
FUEL SYSTEM OMS PUMP IMPORTANT: clogged pulse limiter could limit the fueloil supply from the OMS pump, causing serious powerhead damageIf excessive carbon deposits are found, the outboard must be checked for causes of backfiring before being returned to the customerExcessive carbon deposits result from: Incorrect linkage adjustments Incorrect engine temperature Crankcase air leaks Carburetor problems Extended use of flushing attachment Internal powerhead damage
OMS PUMP
40150 PL MODELS
Disassembly
All screws in this OMS pump are Torxt T-10 and T-15
WARNING
There is compressed spring under the air motor coverHold cover down as screws are removedWear safety glasses, and lift cover slowly to avoid personal injuryRefer to OMS PUMP ASSEMBLY DIAGRAM on p.156Place pump on bench with air motor cover upHold cover down while removing Torx screwsRaise cover to relax spring pressure