2002 Holden Commodore Knocking noise in engine

HI there, this well could have been a lifter, they can get blocked with dirt in the oil and pump up and hold a vale open causing a potential stall condition, if the engine was serviced the fresh oil may have flushed any rubbish away, but with out actually hearing it first hand it is a bit hard to say, the only this that I can say for sure I that if the noise was a mechanical problem, it would not just clear up like that.

Mark (mhpautos)

Hi there, s may be a fuel pump, but you will have to confirm this by checking for power at the pump, this will be only for about 3 sec when you first turn key on, This is normal, if you have power and no fuel pressure then the pump will be faulty, these are a mongrel of a thing to do as it is located in the tank, with the lines & electrical plug removed undo the 6 or so screws, if there is any more than a cup full of fuel in the tank you will need a large container as it will pour out when you break the seal, with the unit loose, there is a return line in the tank you have to undo this is tricky, and then maneuver the pump & sender unit out, this is also tricky as you don't want to damage the float, fitting the new pump is fairly straight forward but re fitting the sender into the tank is the pain, there I no way that I can describe how it fits, you have to hook up the internal hose and jiggle it around until it seats flush, on a hoist this is a real pain on the ground on your back that will not be much fun.

Mark (mhpautos)