Originally Posted by JimVonBaden
From my experience the QD not only needs the button pushed in, but some pressure needs to be exerted to push the two parts together before they will come apart.
Also, the pressure won't let the fuel out, they seal when opened. That is the point of them.
I've found with the chromed metal QDs that they open quite easily. There have been 2/3 occasions in the last year where I'm sure I've seated the QD and heard the click. Then after moving cables, etc. near the QD find that its open. It is probably due to hurrying but it seems to happen too easily. When it does, they don't leak. If the high pressure line, the bike doesn't run. If its the low pressure line the bike will start but run badly.
The plastic QDs seem to shroud the plunger button where on the chrome QD it is more exposed.
As a result I've started tie-wrapping the QDs to the frame.