I filled up my tank and drove for 30 minutes to a grocery store. When I got out of the store the van started up fine. I proceeded to pull out of the parking lot and it died. I started it again and it died right away. It then wouldn't start at all. It cranks but nothing happens. I've replaced my crankshaft and camshaft position sensor and after doing so it started up but sounded horrible and died within a few seconds. Won't start again but still cranking. There have been no signs of any problems before this happened and it gets serviced on a regular basis. There is a hum where the gas tank is so the fuel pump seems to be working fine. I just don't know what else to check.

Connect a code reader or scan tool to the data link connector, located under the dash, and check for codes.