More compression tester BS?

[crash-harris]

Just tried to use my SECOND 1000psi compression tester from ebay (because I can't afford one that costs as much as a head job). And again, this one does the EXACT same thing. Testing via the GP holes, the needle bounces to only about 150psi and immediately drops back down to 0psi. No leaks, gauge just doesn't hold pressure. However, if I plug it into an air compressor and pull it off the fitting after it starts to read pressure, it'll hold until I release the pressure manually. I took the chuck apart and found that when it's locked into a male fitting, it free-flows air in both directions (normal, yes?), but the gauge won't hold pressure between the release valve and gauge head. Am I seriously just screwed on a compression tester that's less than $60? I'm sure if my IDI only had 150 psi on each cylinder that it wouldn't even light off...

 

[oregon96psd]

Buy once, cry once.....
There's a reason the service truck and tool's parked in my driveway is worth almost as much as the house, because if you buy quality it work's lol

https://www.zoro.com/otc-diesel-com...MIycDphfWU2gIVD5l-Ch0lEAN_EAQYAiABEgJlIvD_BwE

https://www.ebay.com/itm/Ford-Rotun...759717?hash=item3d5daf12a5:g:Mj8AAOSw7n9XEb8T

https://www.ebay.com/itm/Snap-On-To...883336&hash=item1ca5eaf08c:g:3s0AAOSwqVdauUx9

 

[79jasper]

Even the harbor freight one is better. Lol

Sent from my SM-G892A using Tapatalk

 

[crash-harris]

The harbor fright one is exactly the same, but apparently doesn't lack a check valve. Guess I'm boned. Just don't have the cash for one. This thread can be deleted.

 

[hce]

The schrader valve/check valve should be in the adapter that screws in the gp hole and the quick coupling should flow both ways.

 

[crash-harris]

There's no threading inside any of the adapters for a valve. Looks like all the GP adapters are cut from 9/16" hex stock.

 

[hce]

You can see the schrader in the end of this one.

You must be registered for see images attach

 

[Macrobb]

There has to be a schraeder valve in there somewhere if you expect it to work - like the picture shows.