Lift pump?

[Konstantin]

Hi guys, maybe somebody will point me in a right direction. It is volvo with iSX Cm870 . Recently I changed fuel filters at a truckstop and after they couldn't start the truck. Later I noticed that one guy took some kind of a round tool put some diesel in it and connected it to the fuel pump. After that the truck start. Mechanic told me that my lift pump is probably no good. Right now i need to turn the key and wait for like 5-10 seconds and engine will start, if I try to start without waiting it might no start no matter how long you crank. I connected insite and ignition ON I have fuel pressure 0. When cranking fuel pressure is more than 100 psi. When running Idle it is around 250. And also I noticed that when i do not wait 5-10 seconds and start to crank right away my fuel pressure is 2-3 psi even if i crank for more than 20 seconds. Is it lift pump or something else? Also i have a wet spot near one of solenoids. Thanks, Konstantin