So it's been brought to my attention on a different thread of mine, that the big black monster that lurks in the dark right hand recesses of the engine bay, isn't functioning as it should. Apparently when I stuck on the pipe that leads from the inlet manifold just below the carb, to the top of the oil bath, I should generate the kind of vacuum pressure that will stick my tongue to the pipe. Instead, I can just continually keep drawing in nice oily flavoured air. I've had a look and the pipe is good, so it's somewhere inside the top of the oil bath that trouble is brewing. The pipe that leads from the other spigot on the top, down to what I now know to be the actuator, does result in a nice bit of tongue-sticking vacuum pressure... so at least I know vaguely my enemy and where it lurks. Any ideas, oh great brain of TLB? I know mostly we have forsaken our oil baths for shiny young things that sit, sparkling directly on top of twin carbs etc, but I'm an old fashioned kind of girl and I do like a good bit of 'stock'! The workings of the top part of the oil bath don't seem particularly accessible, but this is what I can see of the bit what is not doing it's job, when I have a look in through the big pipe that goes to the top of the carb..... Its not a brilliant picture, but hopefully it shows what it should. Anyone know if this is right, or should there be other bits in there too.? If I put my thumb over the end of that bit that is visible, and suck on the tube thingie, there's still no vacuum. Right, that's quite enough sucking for one post, do your thing TLB 1974 Type 1 1776cc engine, older style oil bath, single solex carb. Thanks in advance.