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Message: [QUOTE="mghoodlum, post: 1008483, member: 8490"] I posted this in Tech but I know this thread is much more active and since the truck is modded pretty heavy though I could find some advice here as well Mods: EGR Delete Exhaust SCT tuned with gearhead race 6.0 manis and 6.4 to 6.0 down pipes FASS fuel pump Titan Tank Elite 72mm atmo Head studs 2010 Model F250 55k mi tuned since 32k mi Truck went into shop for cracked up pipes. Replaced manis w/ 6.0 and heavy duty up pipes. Had truck studded and top end checked out while in shop and ungraded turbo to 72mm atmo. Everything checked out good. Got truck back and with 1/4 tank left had "pressure" in fuel tank and acted like it was out of fuel. Took it back and mechanic replaced cap and said good to go. NOT! Drove truck for several days without issue then when fuel was at 1/4 tank had same issues with additional issue of knocking and blowing blue smoke after sitting for 30 min. Took truck immediately to shop. Knock and smoke is persistent on warm start up. Took back to shop and mechanic recommended low pressure fuel system. Checked recommendation with Rudy's diesel and without telling them mechanics recommendation got same recommendation plus fuel sump. Said pressure was actually a vacuum in fuel tank and pressure was air swapping out. Put in FASS Fuel system and sump. Mechanic installed and stated still had pressure in tank. Upgraded vent line in Titan tank to larger size. That has seemed to Fix 1/4 tank issue and still have knock and blue smoke. Replaced #1 injector after code indicated bad. and same. This only happens after running for a while and letting set for a few minutes to an hour. Does not happen on cold start or even every time on hot start! Please help!!! Truck has been in and out of shop 3 times over 2.5 months with several weeks of that waiting on parts but the last 2 months trouble shooting issues not present before "upgrades". Mechanic thinks it is an injector but not getting codes and said May need to replace other 7 injectors. He treated me more than fair only charging me $600 to upgrade fuel tank/FASS and replace injector but not sure where to go from here. Don't want to just throw parts at it as this is getting expensive! Sent from my iPhone using Tapatalk 2 [/QUOTE]