Post-carb-rebuild disappointment (30 HP 4 stroke)

honkbert

Recruit
Joined
Jul 9, 2016
Messages
5
I have 3 carbs I rebuilt with the kits and everything. New gaskets, new float needle, new float hinge, and all the rest. I measured a 14mm float height on all 3, per spec. I tested that the floats were nice and floppy.

I remounted the carbs. I did one test last night where I pressurized the bulb and it hardened. I did another test this afternoon where the bulb also successfully hardened.

I removed the carbs because I had made a mistake with the throttle plates- but I emphasize- I merely drained the float bowls. I did not open any carburetors. I put carbs back on the motor, and now the bulb does not harden and gas comes spilling out of the barrels. First this happened with the middle carb barrel, then I disconnected the fuel tank and let the motor run dry, and then I did another test and gas spilled out of the top carb.

Why is/are the float(s) not sealing the flow of fuel like they should? Why would a minor disturbance cause such malfunction? Did I miss something?
 

gm280

Supreme Mariner
Joined
Jun 26, 2011
Messages
14,605
Silvertip is correct about the needles and seats. However, how much pressure are applying to the primer bulb. If you are seriously squeezing the primer bulb, you could be over pressurizing the needle and seat and forcing fuel through. JMHO!
 

honkbert

Recruit
Joined
Jul 9, 2016
Messages
5
Silvertip is correct about the needles and seats. However, how much pressure are applying to the primer bulb. If you are seriously squeezing the primer bulb, you could be over pressurizing the needle and seat and forcing fuel through. JMHO!


Maybe on my second test I was an eager beaver, but on the first test I was just pressing my normal amount as I was not expecting anything to go wrong at that point.
 
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