Originally Posted by
Bill Van Steenwyk
So, if I understand you correctly, when you installed the fuel pump kit, the motor immediately came to life and ran like you were wanting it to when you posted the first time.
In other words it ran like you had hoped WITHOUT making the jet change, but after the pump kit. Then at that point you installed the smaller jets??
Not trying to pain about this, BUT, if the pump kit fixed the problem WITHOUT the jets, then it was probably too lean to start with, or at least the way the problem was described would point that way, and starving for fuel.
On the other hand, if the motor did not come to life until AFTER the leaner jets were installed, too rich. Unless a de-laminating diaphram can cause a too rich condition which was somewhat indicated by the condition of the plug in the top cylinder. I have no experience with these motors, other than a fuel pump that is not working correctly, usually does not pump a sufficient amount of fuel. Perhaps a Merc technician will chime in here with just exactly what happens with de-lamination of the diaphram, and how that affects these pumps.
The reason I am trying to figure out what you did that solved the problem, is in addition to helping you with your specific problem, this site, and the technical forum itself, is designed to also help others and at this point I am happy you do not have a problem anymore, but unsure exactly what solved it so we can all learn from your experience.
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