Got my vac setup delaval pump with a bender it's been working fine now all of a sudden I have an issue with my bender releaser. For some reason the float just seems to bounce and it doesn't want to hold vacuum. I have taken off the setup I have teed into bottom nipple of the glass which is a tee with a check valve on each side mainline and dump line. Vaccuum will about suck my hand through it with the t disconnected. My best guess is I have a bad check valve? But not sure anyone have any ideas on troubleshooting this?