It could be. If you have not every changed it, you probably should anyway.
Before you go ordering more parts, listen for the fuel pump in the vapor separator. It should run for about two seconds when you turn the key switch to "on". If this does not run, your motor is not going to run.
If you can hear it run, you can check the fuel pressure off of the vst by removing the bolt from the cap that holds in the high pressure filter and inserting a fuel pressure guage.
Since you probably do not have a gauge, remove the bolt (it may be under pressure, so use a rag to protect yourself from any fuel spray. This is not standard practice, but in a pinch, have someone hold a rag close to the bolt hole (use protective glasses) and have someone else turn the key switch to "on" again. If fuel streams out of the hole, your pump is most likely working ok. Without a gauge, it is really impossible to tell for sure.
If everything seems to be "flowing", then it is time to check the ignition.
Make sure that all of the spark plugs are installed and all of the wires connected. Connect a timing light to each spark plug wire and have someone try to start the engine. If the light flashes, most likely you have spark. Again, without using a spark tester, you really do not know for sure. If there is no flash, you do know for sure that you do not have spark.
If you have both fuel and spark, then you must check your compression.
If compression is good, then you will have to check the timing....hopefully, we will not have to get to that.
We are just trying to verify what we have and what we do not have.
You need compression, spark, and fuel all combined in the proper manner at the proper time.
I hope you do not feel that this is a wild goose chase.
Mike