Need to locate fuel filter on 2004 volkswagen passat

I bet it's the gas. After some time the gas will no longer be volatile enough to start the car. Try draining all the fuel and putting in some fresh gas. Remember, when you try to start it again you'll need to get the new gas through the pump and lines before it will start. Also, check the condition of the injectors. Old gas can start to break down and build up a film that could be on your injectors (or clog your fuel filter- better check that too). Hope this helps.

Under the engine, remove the road pan/shield to access it

The third line is part of the evap system. The charcoal cannister serves both the engine and the gas tank. It shouldn't necessarily have gas in it. Hope this helps.

it hard to say there few things that could cause this but sounds like it a Fuel issue
Possible bad fuel pump totallly clogged fuel filter bad injectors Out of gas etc.
first thing you need to do is check your fuel pressure ( I bet it be low ) if it low check fuel filter if fuel filter good replace fuel pump
If Fuel pressure is within Specs then test the injectors
if Fuel pressure is ok and injectors test out ok then check ignition system (spark plugs, coils, module etc)

if it fires then dies, you have to reset the alarm system with the key/remotes???otherwise you need to plug in the diagnostic computer(saves hours of "fun")

Could be a lot of things. A sensor, bad gas, clogged fuel filter, spark plugs, plug wires, camshaft position sensor, etc.. Check engine light on?? If so, have the the code scanned to find out the fault code. Go to your mechanic, or local auto parts superstore...most do it for free banking on you will buy the part from them.

If there is a rubber return line going back to the gas tank clamp it off with vise grips. If it starts it is the fuel pressure regulator. If not try changing the fuel filter.

Low pressure at the fuel pump.Check and change if nessery.

99 vw passat 1.9tdi was driving sound but just died just turns but wont fire up

i think the fuel filter is connected to the fuel pump below the vehicle in front of the tank.