Re: OUTDRIVE DOES NOT LIFT BUT PUMP MAKING NOISE
had similar problem on 1974 outboard with same pump as on my 1976 140... had someone else twiddling with adjusting screw on pump while I played with switch. Once I got it to go down it went up with no problem. I'd guess that you've got trash or air in the system. Not being a smarty pants but I'd read a mercruiser or mercury manual on trim pumps. I've never done that and it's about time. I do know they have bleeder screws or valves.