ferm & ridge might know this, but why abandon the built-in fuel pump? i would let the electric prime the system and after about 3-5 minutes of running, shut it off and let the mech do its thing. this is what we do on our trenchers. they have v4 wisconsin engines and the fuel pump is not that reliable and a pia to get to, so when we have a problem, we just install a cheap elec inline and leave the existing in place.
i can always tell when my merc pump is getting weak, after about 15 - 20 minutes of trolling, it starts starving for fuel and i have to pump the ball up.
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