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Let me begin by saying I am no expert here - have just gotten to know my boat, and Yanmar 2GM really well!
I doubt you would have an issue with either flow or overpressurizing from the squeezebulb. The greater chance of trouble would come from the often inferior clamps / fitting possibly aloowing air leaks in, or fuel leaks out. Air leaks could hurt performance, and reliablility. Possible fuel leaks could cause fire / insurance problems.
Re: the mechanical pump not working well. Iam more used to gas engines than diesel, but being a four stroke, I am guessing that the camshaft may only allow the fuel pump to work well from the lever, in one or 2 of the 4 possible strokes (someone feel free to correct me). What I mean by this is if the pump doesn't seem to be working well, using the lever, flip the decpompression levers, and crank teh engine over once. If it still doesn't work, try it again, and possibly again, until you feel more resistance, in the last part of the pump stroke. hopefully you should see fuel coing out the bleed hole ASAP.
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