- Check the suction side piping union. While the pump is running, try to tighten the union. If this does not stop the air leak, turn off the pump. Loosen both unions and slide the pump out of the way. Remove, clean and re-install both union o-rings.
- Reposition the pump next to the piping and secure the union nuts to the pump. With clean union o-rings, hand tightening of the unions should create a seal. If the unions still do not seal, gently tighten with a large pair of tongue and groove pliers. DO NOT OVER-TIGHTEN.
