motor stops after 1/2 hour

[John Noble]

7 1/2 1971 johnson with new gas line from old tank to motor. It cuts out after 1/2 hr. and gas bulb has lost it's pressure. After pumping up again motor starts fine. Could there be an air leak where I put on new clamps?

[boats.net]

Could be an air leak, could also be a bad fuel pump.

[Rebel Sympathy]

Could be an air leak, could also be a bad fuel pump.

Can also be a bad primer bulb - especially if it is an aftermarket gray colored primer bulb. Replace with genuine oem part.

[cosmo1957]

You may be getting air lock in the tank..... open the gas cap up ...and see if you are creating vaccuum in the tank.... I was on the lake w/ my 25 HP and couldn't get it restarted and it was just simply too much vacuum pressure built up in the tank so it wouldnt draw any more fuel.