Truck Wont Stay Crunk Up.

<FONT face=Arial size=2>First of all. Hello. My problem is I had my truck parked for about 9 days. When I went to start it it would not start plent of volts to turn but no start. I check my fuel filters one in front is full, the one under starter was half full. I spray little starter fluid and truck started but only for two seconds. I try to start it agan but nothing. I hit it with starter fluid again it starts and runs for 2 seconds then die. I changed out SRS and TRS sensors and fuel pump, but same results. Engine is in a 2001 Freightliner FLD-120. Can someone assist me please? </FONT>