Originally Posted by codprawn
And yes maybe I do need to shove it in further - how far is too far? Seriously though are we talking regular sort of depth or a gynecological examination?
Usually, there is a length of tubing that connects the telltale nozzle to the block. Perhaps you can disconnect it at the block end and see if you're getting pressure (or water) there?
I found blowing a jet of compressed air or a high pressure stream of water into the telltale on my Honda 40 would often clear things up. For some reason, it was pretty sensitive to clogging up (may have been from blowing the crap back into the motor though, now that I think about it.)