truck runs like crap after changing out fuel line

[Suprman]

so i took the truck to kansas from georgia to pick up a lightning last week. got to kansas and back to TN fine but then it started having no power and could barely get itself and the trailer up an exit ramp.

got pulled over and had a huge fuel leak under it, to make a long story short i had a shop replace the passenger side fuel line that goes to the head and the fuel bowl valve and put a new filter on it.

went to go pick it up yesterday and bring it back to atlanta. about half way back it starts acting up. now i'm getting smoke (white or blueish i can't tell for sure) it mostly happens on decel as the truck accels fine unless i decel and try to accel.

it holds speed fine as well, just seems to have some hesitation/studder sometimes. what could this be?

also i'm supposed to make a run to TN today but only about 100 miles each way, will it be ok to drive this thing?

[Suprman]

the oil cap does not blow off the oil fill area, no blowby i can feel at all

i just started it up and gave it some gas, started blowing smoke out and then seemed to go into a failsafe mode where the idle got bad and i couldn't rev it up anymore and sounded like a knocking sound


also i believe it first started acting up after going up a pretty good size mountain at speed

[SCUFFY828]

you have no fuel pressure , either pump is weak or tank is clogged, low fuel pressure will cause your smoking problem