Tank will not build up more than 40lbs!
I bought a CH vertical WL6700 series compressor about six months ago. It worked ok for a while, but recently, it will only build up pressujre to a max of 40lbs. I checked all the air lines; no leaks. I thought it may be the check valve, so i replaced it. With the new check valve, it would build no pressure at all. I removed the large spring from the check valve; you (still) get good air in the spray hose, but no more than 40lbs in the tank. I'm about to pitch this thing if i can't figure out what is wrong. When new, it would build to about 120lbs. I also checked the belt (it's new). If you blow into the check valve with the primary button depressed, air will go out the spray hose outlet no problem. You only get about 33% or air coming out the inlet that fills the tank. I can't belive i could have two faulty check valves in a row, so i must be missing something. BTW, when the pump is running, i can barely hold my thumb on the outlet from the pump - so the output from pump seems strong. HELP!