OK. You don't have to like plumbing to solve this one.
How is the pump oriented?
If it's pumping vertically upwards then usually there wouldn't be a problem.
If it's pumping horizontally, then it depends on the route of the pipework.
If it's pumping vertically downwards then there's probably air trapped in the pipework above the pump. If I found one positioned like this then I'd add a vent at the highest point of the pipework that's leading to the pump.
How is the pump oriented?
If it's pumping vertically upwards then usually there wouldn't be a problem.
If it's pumping horizontally, then it depends on the route of the pipework.
If it's pumping vertically downwards then there's probably air trapped in the pipework above the pump. If I found one positioned like this then I'd add a vent at the highest point of the pipework that's leading to the pump.
