SOURCE: 2003 vw jetta tdi fuel filter
It is on the passenger side right behind the washer fluid fill tube. You can follow the fuel lines (look like 1/4" black tubes, some are clear) from the injector pump to it. It is a caniser a bit bigger than a normal looking oil filter and sits between the washer bottle and the metal that forms the wheel well. It is held in by a screw type clamp about half way down the cylinder. Probably isn't the fuel filter unless there is air in the lines to the injector pump or they didn't bother to fill the fuel filter up with diesel after putting it in. There is not a fuel pump in the tank in these cars so everything is sucked up by the injector pump and it needs to be primed properly.
SOURCE: 2003 Jetta TDI deisel fuel filter change
Fill the filter with ATF, if no diesel fuel is handy. The T section with double o rings and a hair clip was removed, pour ATF in the resultant hole until it was full. Remove the clear line from the filter to the pump by disconnecting it at the filter. With a thin tube fill the line with ATF fluid until no bubbles remained. Reconnect the clear line to the filter. The car should start immediately.
SOURCE: How do you know if the fuel pump needs to be
Best thing to do is a fuel pressure test, the car does not have to be running to do the test just turn on the key. You can rent the pressure tester at auto zone.
SOURCE: 1998 Volkswagen Jetta TDI Vehicle will not start/Clutch?
You have an interlock switch on the top of the clutch pedal. Is it out of adjustment? This will prevent the starter from cranking.
SOURCE: where is the fuel pump switch or relay located on
usually you have to lift the cover on the battery and their should be a little box that has fuses and relays BUT I AM NOT 100 PERCENT SURE
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