When the test gauge is leaking...

Boon

So I've tried testing like three times, bubble tested everything ... except the gauge! The schrader valve is leaking. Now what do I do?

I pulled a cap off of my car wheel and tightened it on there but it still leaked. Maybe I'll try another cap.

Is there something smart that y'all do when this happens?

JUGHNE

Use a Schrader tool to back it out and retighten. Exercise it a bit first might make it seat.......or replace it with new core.

delta T

We always have a spare core or two on hand when we do a pressure test. 99.5% of the time when I have a leak it is the test assembly, always the first thing I check if the pressure drops. I think you can get them from most bicycle repair shops for not too much $. A good schrader tool, or a cap (like the ones in the pic) that have the tool formed in work well.

delta T

EBEBRATT-Ed

a few times I have vainly looked for a leak that didn't exist......except on my test gage or hose.......someday I will get smarter

hot_rod

That is a frustrating lesson that we have all learned

I have also had gauges develop a leak up inside them.

On large radiant air test I eliminate the schrader valve, screw a 1/4 ball valve and the quick couple that matches my air hose.

It eliminates the tire stem leak potential and really speeds up the fill. No need to hold the air chuck either.

JUGHNE

You could have a good ball valve to isolate the testing equipment from the system being tested. Open to fill then close, open to peek at pressure as needed. (for overnight or prolonged testing, obviously not to monitor tubing during pour.)