Make sure your fresh tank (& water heater) is full, then run the pump with faucets on. There could be air in galley lines, toilet, and bath faucet hot and cold lines, so alternate those until there's no more air, which could take several minutes. You want to include the exterior shower faucet as well.
When you finally shut the faucets off, the pump should maintain pressure without cycling on until you use more water. Our Airstream Avenue seems to get air in periodically after driving (never overnight when dry camping) unless the fresh tank is perfectly full. I've found no leaks, so it can be frustrating.