Drop the rear tank today to see if my problem was in there and the pick up tube is in good shape and no dirt or rust in the tank .The only thing I seen wrong was the vent hose forthe tank vent was smashed in between the frame and the bed so i put a new hose on and put the tank back up and my problem is still there .But for the last couple days the problem is gettin worse when the truck looses fuel goin around turns and curves it blows out blueish white smoke out the stack dont think i really noticed it before and it is starting to die when im comeing up to stops a stoplights and stop signs.....In need for some thoughts

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I was thinking?? The water separator onthe driver side fire wall was removed from my truck from the owner before me at the fittings they installed to bypass it they have the diesel oily film ( not really wet or dripping) But have the separator removed would that be causing the driveability problems im haveing? And this morning I noticed that at one of the fuel line fittings at the back of the injetion pump goin out to a injector is a little wet it doesnt drip while running ..but I was told that wouldnt be causing my problem because its after the pump..