hi mate,when the merc 310.2.9 is running theres a noise like ,pish a pish phis a psh.sounds like a pump .I know its vague but thought you might have an idea.we bought her and she,s of to Yorkshire in 6 weeks to get the vac pipes and throttle linkage done and a manifold gasket,thanks for all the advice mate,were totally new to this and dreaming of leading a better life.cheers