Thanks for all the tips. I'll keep them all in mind when I head out to field tomorrow. The Magnum 52FS that I used on my EIII was mounted semi-inverted with the head in the 7 o'clock position. I was advised to use a clamp on the fuel line when the engine wasn't running to prevent siphoning but didn't find it was really a problem.

So we'll just see what happens tomorrow. Whatever happens it'll be good to find out any problems with this setup now rather than once it's all mounted in my scale Snipe.