I have an '80 model Johnson 25H it has been giving me problems since i bought it. for startes when i bought it used i had to leave the choke on in order to get the thing to stay running, so i changed all th fuel lines and connectors, I would have changed the fuel pump but the person i bought it from said he had that done already and the pump in fact looked new. Any way after replaceing all these lines and such the problem remained. " choke has to be out and you cant go fast or it will bog down shut off and not want to run " so I finaly decided to get a carb kit and figured why not get a fuel pump kit too. rebuilt the carb and boticed the kit was different from the pump, some one had put the wrong pump on the motor, so i replaced it with the right pump and ran great on the test run, but then the next time i decided to take it out it bogged down and shut off at full throtle, and wouldnt start back up. Any ideas what is going on?