so I'm helping a buddy fix his boat. it is a 2000 4.3 gl serial number 4012049665
anyway , boat was fine all last year. first run this year on muffs was all good. put it in water and overheated slightly. no known damage. pulled impeller, it looks great. checked it on muffs again it worked fine. checked in lake no water. pulled hose from out drive off pump, I can suck water by mouth from hose. put hose back on, nothing. pulled hose from pump to thermostat and sucked while running engine. got water then pump took over and continued to pump.
pump itself looks fine. is there something I'm missing or is the problem somewhere in the pump not being able to draught water. hose connections were undone and redone many time in troubleshooting this so I don't think an air leak exists there.
also can someone tell me what a new complete pump is worth, and possibly a part number?
looking for ideas as to what's wrong please.
anyway , boat was fine all last year. first run this year on muffs was all good. put it in water and overheated slightly. no known damage. pulled impeller, it looks great. checked it on muffs again it worked fine. checked in lake no water. pulled hose from out drive off pump, I can suck water by mouth from hose. put hose back on, nothing. pulled hose from pump to thermostat and sucked while running engine. got water then pump took over and continued to pump.
pump itself looks fine. is there something I'm missing or is the problem somewhere in the pump not being able to draught water. hose connections were undone and redone many time in troubleshooting this so I don't think an air leak exists there.
also can someone tell me what a new complete pump is worth, and possibly a part number?
looking for ideas as to what's wrong please.