Thanks for the reply. No, it's not strange at all, I wasn't sure how much space was allowed for expansion, and guessed that it would be fairly low when down to the last lb, and I've just re-weighed the bottle empty and it only had 11oz in it so even lower in the bottle. I know the dip tube is about 1" from the bottom, and allowing for g force pushing the liquid to one side and it's quickly becoming a possibility it gulped gas not liquid? What do you think? I don't suspect anything electrical as it all checks out in the workshop, can't find any poor connections, and have never had issues before. It's very consistent normally. Pressure at the start was 900psi and I don't monitor pressure but can see it getting richer on a run so know it's losing pressure and at the end of the track its down at 750 usually.
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