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I agree with Ken/Claudia, or you could have a leak. Do the cheap things first. Look in all your cupboards where there's water connections to verify they're not leaking. If that's good, purge the lines of any possible air. Turn the pump on and open all the water outlets 1 at a time (hot and cold-don't need heater on for this) to purge any air from the system (and outside water outlets). If that doesn't fix the problem, you might be able to do some minor adjustments to the pump itself. Per the Shurflo water pump site for more things to check -
Correct voltage to pump +/- 10%
Loose drive assembly or pump head screws
Are the valves held open by debris or is the rubber swollen?
Pressure switch operation. By-pass set higher than shut-off
Hope this helps!
Rick
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