Reply To: Carb kits for Merc 7.5 #7106835

Home › Forum › Ask A Member › Carb kits for Merc 7.5 #7106835 › Reply To: Carb kits for Merc 7.5 #7106835

November 9, 2023 at 5:56 pm #282372
JACQUES
Participant

    hanks for info … The utube guy  had similar problems with kit parts and ended up using 18-7215… the  neeedle and seat may be bigger ??? for a 40hp but the rest sure looks the same.

     

    There is a small hole, about 1/8 inch diameter, in the carb to manifold gasket that lets manifold pulses route through a passage in the carb to the fuel pump.
    Dave

    thanks… sure is a weird design…. the smaller  “pumpless” carbs on the 4hp are simpler with the usual pulse line design .  I guess that makes one less hose to fail  🙂

    I looked at it closer  .. the pump must work on a vacum pulse   on the piston  upstrokes whereas the  other types  (J&E)  work  on  crankcase pressure pulses due to the reeds.

     I’ll mare sure they are cleaned out !

    Joining AOMCI has priviledges 🙂