HI CAN ANYONE HELP ME CONFIRM A FAULTY PUMP ON THIS CAR HERE IS THE INFO I HAVE:

FAULT CODE 00550 START OF INJECTION REGULATION
17-10 CONTROL DIFFERENCE, INTERMITTENT.

MEASURE BLOCK 018: WITH ENGINE RUNNING

BLOCK 1: 0.00v ?
BLOCK 2: 13.40v
BLOCK 3: 00001000 (INJECTION TIMING ADJUSTER DEFECTIVE) ?
BLOCK 4: 0000

HAVE CHECKED THE MAIN INJECTION PUMP WIRING, VOLTAGES AND EARTH'S ALL OK
HAVE CHECKED ALL MECHANICAL PUMP TIMING ALL OK.

ENGINE STARTS AND RUNS BUT WITH LOTS OF FUEL COMING OUT THE EXHAUST AND LOUD KNOCKING NOISE FROM ENGINE IT TAKES REVS BUT NOT UNDER LOAD
I THINK IT NEEDS A PUMP HAS ANYONE SEEN THIS CODE BEFORE AND CAN I DO A PUMP WITH VAG COM OR DOES IT HAVE TO GO TO THE *******'S, ANY HELP WOULD BE GREAT, CHRIS.