So you pulled the screen from the bottom and cleaned it 2 tears ago and you also pulled the filter out from the top and replaced it?
The bottom suction elbow uses a simple cork gasket and shouldn't need any sealer, gasket # C5NNG879A available from NH dealer or eBay.
Since you'll have to drain the tank to replace the suction elbow gasket, I'd pull the suction screen out and clean it again, if it has much stuff in it I'd replace the filter again too.
The filter is inside a canister inside the oil tank, if the filter stops up the relief valve opens allowing fluid to bypass directly thur the center of the filter and out the bottom return into the tank.
It's nearly impossible for this design to induce air into the system.
Check the suction screen and that short rubber hose between the suction elbow and the pump, make sure it's not separating inside
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