I got an Anchor 500CP and from new it seemed to take forever to get any pressure in it and would not go past the red mark.
So I got an EZ pump.
The check valve would not let any pressure in through the EZ pump.
I diisassembled the check valve, nothing wrong and refitted it.
This time I can hear the air going into the tank when I pump, but it stops at manometer reading 1.
I let some pressure out and try again, and two more times the valve works up until pressure "1".
Now I refitted the normal pump and the thing pumps up easier than ever, and to full pressure, and I can hear air going into the tank with each stroke.
So I refit the EZ pump and try again, and the check valve doesn't operate.
I put back the standard pump and again it works fine.
How can this possibly occur?