Finding pin holes in a closed loop system

[my2rotties]

Before thinking my pump is totally shot, how do I find pin holes in the pipe of my closed looped system? The pump will either hardly have any flow or it will work correctly and blow millions of micro bubbles. Thanks for any advise

[Tom R]

I would think that if you had pin holes in your closed loop you would have water every where.

Tom R

[mark]

some how it's air-locked?

[my2rotties]

I would think we would have water all over the place too. When hubby called the LFS, the fellow said we have air in the pump (don't know how it suddenly would get in there but any how...).

I shut the pump down, I also turned the water off to it, put my hand in front of the water inlet... did everything I could think of.

What is an air-lock and how would one suddenly materialize?

[golf nut]

where are your closed loop pics?

are you going over the top with the feed to the pump?

[my2rotties]

This is the best picture that I have on hand at the moment. The pump is behind the skimmer. The feed to the pump is on the bottom of the sump if I am understanding your question correctly.