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Lots of places fr air leaks on a engine. Front and rear crank seals, valve cover gaskets, pan gaskets.
I would take the pump apart and give it a good cleaning.
The vanes should be even with the rotor when fully seated in the slot.
Add a dab of grease to the top and bottom bearings.

I designed this pump for Moroso back in the 90's. Its a stout piece and can work well with the right engine prep.
 

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Air up the engine with 3-5 psi at the exit fitting. Then spray it with soapy water. It's amazing what leaks but doesn't show.
Doug
 
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