My w202 benz wont start but gives on, the fuel pump doesn't run and the starter wont crank the engine when i try to start it. i even tried to bypass the starter but it wont crank

What do you want to know? The fuel system is basic on this machine. Does the electric fuel shut off solenoid snap on an off as designed? Did you already replace the cracked fuel line? The battery needs to be fully charged. Maybe I can help you with this advice. After the fuel line is replaced the injection pump will be loaded with air. Loosen the black plastic primer screw from the top side of the fuel filter housing and prime the fuel filter until fuel flows out without air bubbles or remove the inline fuel filter, fill it, reinstall it and prime the filter. After that there is a nickel size flat screw that you will loosen before you crank the engine over. The screw is located in clear view,on the injection pump. This bypass screw will allow air to escape from the fuel system while it is running. With the screw open (turned counterclockwise) crank the engine over. You may need to try 6-8-or more times before it will start. Be patient, don't overheat the starter and if the battery starts to wear down "STOP" and put the battery on the charger. Ignore this warning and you will be replacing the starter as well. If you do get the engine started wait 30-45seconds before closing the bypass screw. Do not crank on it. It only needs to be snugged closed. Please give this a try and let me know. Any other questions please write back.

crank sensor is the main sensor for the ignition. with this failing the engine will not start or even try to start. what you could have is a compression spark this would feel like its starting but not. cam sensor fail it will start but will have no adjustment on timing. injector relay relay this will stop the engine running fuel pump relay same. even an alternator problem can stop the engine from running if it has the link from the starter to the alternator. depending on engine. but if the alternator light goes out while turning engine over its not this one.

If no power on the plug to the fuel pump, most likely you've a blown fuse on the fuel pump. Check that all fuses are good with a test light.

The term " CRANK" is what the Starter is doing to the Engine. I think you mean is 'it Cranks but wont Start'.
Is the engine getting Spark? Is the engine getting fuel? You need to check these two things before randomly swapping out parts.
If it's fuel starvation.. Check the fuel pump relay or possibly a bad Fuel Pump.

if it was the fuel pump engine should start with starter spray at least for a second or two, so, it sounds like your fuel pump is bad.
turn ignition to run and try hearing the pump run.

wont crank?
or cranks robustly (the crankshaft spins fast) but wont start.
all cars that dont start one, all ran when new. etc.
what counts is the now. only.
you need to do the tests. all covered in the FSM or at alldata.com
i cant help you because you . cuz did not say crank or start? so......

1: test all fuses. (not just gandering, use a meter)
2: check battery voltage 12.6vdc rested.
3: if not cranking, wiggle the shilter (a/t) or clutch if m/T
if a/t? try cranking in Neutral. cranks now? bingo.
4: cranks ok, and fast so check spark/

ill end there, due to vast number of tests and no clear stated
symptoms.
ever give it a full tuneup (60,000 mile service schedule?) or this DECADE. if not why ask the spark plug question.

IT IS LOOKS LIKE A FUEL PRESSURE LEAKING INSIDE THE ENGINE OR DEFECTIVE FUEL INJECTOR LEAKING . TRY DISCONNECTING THE FUEL PUMP RELAY. AND CRANK THE ENGINE IF ALWAYS CRANK WITH OUT OF FUEL (CRANK WITHOUT START) YOU HAVE FUEL LEAK INSIDE THE ENGINE
REMOVE THE INJECTORS RAIL UP EVERYTHING CONNECTED,PUT BACK THE FUEL PUMP RELAY TURN THE SWITCH ON AND FIND WICH ONE IS LEAKING. (GASOLINE IS FLAMMABLE TAKE CARE)

No crank to a mechanic means the starter motor doesn't spin the engine over, is this what you mean? Or do you mean the engine cranks over but will not fire up and run? If it is the latter have you added at least 3 gallons of gas to the tank to make sure the electric fuel pump inside the tank can properly prime? If not do that, also you can spray starting fluid into the engine engine air intake pipe after adding the 3 gallons and see if that gets it going. If it still will not start you have burned up the fuel pump and you will need to drop the fuel tank and replace the pump, remember the pump is cooled and lubricated by the gasoline it runs in, so when you run low on fuel or out you can very quickly severely damage the small electric fuel pump. Never let the gas gauge level go below 1/8 tank to prevent premature fuel pump failure.

dirty fuel filter or flooding

have you tried the spark plugs and fuel injectors as well as the air intake system?