The pump outlet is very close to the LCB and I can't recall whether this was routed in metal or rubber tubing or a combination of both and where it was routed.
I do intend to change to an electric pump in due course, which will resolve this, but at present just want to get the existing set up working on a safe footing.
Could anyone advise on how to do this or better still post up a pic or two

Many thanks
Cheers
Jon