old timer! im only 27 lol
i got taught about kjet tho coz i own a mk1 gti
cam an ign timin are a piece of piss to check an adjust
i can check the spray pattern of injectors an weather they 'dribble' when engine's switched off but proper pressure testing of the system requires a special pressure tester an i only know of one place with one of those.
if the fuel pressure was low tho it probly wouldnt even run tbh, they run at 5 bar coz it takes that to open the injectors so if the pressure aint there it jus wont inject. any fueling problems are usually to do with other components like the warm up reg affecting the system pressure or faulty metering heads etc
have you got any runin problems?