pesky leaks, help!

[SN toter]

Okay, so I've got a situation....

this 68 classic gasses up, and leaks unless I pull and hold the trigger...when the trigger is pulled, it farts but does not fire. Now I replaced all the orings that I saw that were even slightly worn, and to no avail. Can someone narrow down my problem area for me? I'm not really sure where to look? I've checked the on/off, etc... help! thanks!
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[olinar]

i dont know what the problem could be since you took care of the valve. make sure the tolerances are straight. check the on/off pin and the sear clevis rod length. i believe its .750 for the pin and 2.125 for the clevis rod

[Coralis]

turn up the velocity and then see if that takes care of it .... also sounds like you need a power tube oring, if you changed this make sure you put the spacer back in