Poor starting as described and light knocking at higher rpm both can be caused by air in the fuel.scott911 wrote:... if i leve it for 10 minutes it will not start will spin over and over and over and fires cuts fires cuts out then fires revs and runs but lumpy on tick over sometimes cutting out and when driving along the road at about 40 mph about 4500 rpm ish i t makes a slight diesel sound under the rocker cover and im scared its gonna snapped cam shaft all over again just sctracning my head to what it could be as i have already replace main fuel lines from tank and lift pump which fixed it last time so now the question is why would it make a sound at around 4500 like its over dieseling and hunt on tick over sometimes cutting out
Check for -
Air leak into the injection pump, e.g. bleed screw not tight or sealing washer missing.
Air leak in hose or connections between the injection pump and regulator valve on the filter head outlet.
Regulator valve missing from filter head outlet or faulty. Valve should remain closed when blown through both ways (i.e. using low pressure air) and only open when fuel pumped through using the hand primer by or cranking the engine on the starter.