drained fuel tank and removed screen and checked pipe work and all was spotlessly clean.
Replaced O ring on FSOV, all problematic faulty pipes and O rings have now been replaced.
You can still see air bubbles in the lower most fuel line, the one that runs from the underside of FSOV to the lift pump.

Engine still knocks at idle and up to 1250 rpm ish.

The bubbles don't bother me, its the knock at idle that's driving me mad. Maybe its not the bubbles causing the knock but a faulty diapham in the lift pump.
Worst case is a faulty IP, I doubt it but I could be wrong.

Buying a complete doner car tomorrow for £200 and use it for spares as engine runs nice and sweet. Still taxed and MOTd but gearbox wont select 4th gear.


Can anyone think of anything else