My car cranks but will not start RVR GDI mitsubishi

Well, you need 3 things for an engine to run; air, fuel and spark. Air from the air ducting through the air filter, the fuel from the pump usually in tank to fuel filters {pressurized} into the injectors for fuel. Spark is a bit trickier; you have a cam sensor, crank sensor, coil packs, spark plugs. There are more components in each of these 3 classes so unless you are familiar; it's best to take it to a mechanic.

Does it have spark to the plugs ?

Check the spark if you have fuel pressure ,all the best.

If you have spark and your fuel pressure is good next to check your timing get a timing light and check your timing

You may have to lower the tank to get access to fuel pump located on top of tank

re check ever thing you did sounds like something is isconnected somewhere

Have you changed Fuel pump relay, or plugs/wires?

Got Mitsubishi challenger 6g74 there is no spark, changed the crank and cam sensor, fuel is coming but still no spark. please help

If it is cranking with out turning over I would check the fuel pump and ignition relay, crank and cam sensors.
Basically you need to figure out if you have a spark issue or a fuel issue. (as long as you didn't have a serious overheating problem). One way to help you figure this out is by spraying in some starting fluid while cranking the engine. If it starts you have a fuel problem, if nothing then you have a spark problem (assuming you didn't blow the head gasket from overheating and was running normally before this happened).
Based on what you've already done here are my recommendations:
No spark: check ignition relay
No fuel: check fuel pump relay (aka shutoff relay, aka fuel pump shutoff relay), crank and cam position sensors, fuel filter.
There is also one other possibility, that the timing belt snapped. You would need to remove the timing cover to check this.

http://www2.partstrain.com/store/?Ntt=Fuel%20Pump&N=1676%2011327%204294964190

Be sure you scroll down to the ones for all engines. The top few are for 2.4 Liters only. It is an in tank fuel pump and you'll have to drop the tank to install.