there is no schraeder valve at the fuel filter housing this is a 01 model fuel bowl right above the HPOP.....i started it today mild day here it chugged for a few minutes blow a small amount of black smoke out the tailpipe then it smoothed up and turned to blue stinking smoke again! also from the time i turn the key on it takes my fuel pump almost 2 minutes to stop "build pressure?" each and every time i do this, if i turn the truck off from just starting it same thing right at 2 minutes, could the pump be weak? all cylinders contribute the same now no bad injectors, also changed the IDM,and the PCM under the dash. went thru 20 injectors be4 i finally got 8 that didnt come and go on the truck, i have a video of the truck running but i cant seem to get it uploaded to my pc so i could show some of u how it smokes, it is real slow reving from 1500 to redline its got a real lag between it. when its first started in the morning the engine wont rev at all, did a check on the return line to make sure it was free from being clogged air was free to the tank no restricions, blowed air back into the tank, also took the pump line off be4 it gets to the pump and done the same thing, but this blue smoke is killer, never goes away even at idle after it warms up it gets worce, blpw by isnt that bad did the trick of setting oil cap on top unscrewed and it never moved like alot will say if u have major problems it will blow it off, here is a list of stuff i have done in the past month, new injectors,icp,fuel pump,ipr,fuel filter housing,ebp valve, changed the oil,filters,uvcg, i keep getting a code of icp out of range or desired, i have noticed on scanner when driving it the icp goes from 2500 to like 1500 or 1600 jerks really bad in overdrive at low speeds, it has spells of not pulling at all and will not pull itsef off the rd, im about to the point of throwing a cummins in it if this POS doesnt get fixed soon. TIRED OF WORKING ON IT. oh ya and there is no gas in the fuel at all i ran it completly out the othr day just to make sure. please help this thing is driving me nuts.