I have a small sand-blast cabinet that I've had a long time but hadn't used in years. Recently wanted to use it on a project but could not get it to pick up the abrasive material. I've taken the pick-up tube out and checked it and could find nothing wrong with it, clear and not plugged up. Checked the seals and orifice in the gun and all looks good. The gun works by siphon, if I take the material hose off of the gun and put my finger over the hole for it while pulling the trigger I can feel a slight vacuum, not sure how much is enough, but it will not pick up material. All I get thru the gun is air.
Last time I used it was working fine but was some time ago. There is not much to this thing so it's not rocket science, the problem about has to be either the pick-up tube or the gun but I can't see anything obvious with either. Open to ideas.