Fact-----Charge the battery.-----Have battery load tested , even if new !---Take starter apart for inspection , and ohm test on armature.----No money spent !
Check the fly wheel key.----Post the compression values here.----There may be issues with crankcase compression.----Crankcase compression PRESSURE is what drives the fuel pump.
Those lower units are not robust.----It is near failing and leaving you stranded !!---Take it apart now.------Finding a used one in good condition may not be easy.----New factory parts are expensive !
That model # is on the production list !!-----But some of these are shown with a 6 vane impeller.----And when folks shop online , you never know what shows up at your door.
Best to do a complete evaluation of transom and stringers before spending any beer tokens.-----Looks like a complete overhaul in your future.------I think you will be disappointed with the materials used by some boat builders,