Blenheim Fuel Cock .......

[Blackdog_kt]

First of all, make sure your mixture is indeed rich: the controls in the Blenheim are reversed, similar to every other RAF aircraft, so in order to get rich mixture you have to pull the levers back.

The levers have a full range of motion (they don't snap into place) but they are actually binary in nature: anything from the middle and forward of the lever's travel range is auto-lean, anything from the middle and back is auto-rich. This is accurate and not a bug (they were the same in the real aircraft).

Apart from that, i find that it's a bit temperamental on start-up. If i try to start with too low or too much throttle it either lacks enough fuel to start or gets choked by excess fuel respectively.

In my experience it takes just a nudge of throttle before hitting the starter button.

The trouble is that if a failed start occurs due to too much throttle, it seems increasingly harder to start them up on subsequent tries. So what i do is try to be on the safe side and attempt starting with less throttle and if that doesn't work give it a bit more, in order to avoid flooding the engines with too much fuel.