It takes a while to work the spurts and sputters out. If there is still a lot of air on the pressure side of the system, the pump won't shut off either. Turn on all your faucets and let the water run until the spurts and sputters quit before troubleshooting anything else. If it never quits, then I agree with minggat, air leak on the suction side.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.