Thanks for the reply. When I changed the bottle, thinking this was the issue, I used a round one from an Audi A3 which has some fancy return system inside the bottle, like a dip pipe & this is when I found out it was still sucking. My return was on the heater side so I have blanked that off and have now removed the breather vent and done like you have which now works fine. Mine doesn't even suck, and took a long time before it started to circulate but once it built pressure it worked fine. The real test will be on Thursday when I do a shakedown.
Jono
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