by htg engineer »
Sat Sep 29, 2007 9:49 pm
Sometimes the trapped air in the pump can be to do with the position of the pump.
Check which way your pump has been installed, The pump head should not be mounted in the vertical position ( the vent pointing vertically up or down)
Hope the site allows this link:
http://www.ntsupply.com/files/products/L-UP-TL-042.pdf
Look at figure 4c.
Hope this helps