Blue smoke on warm start HELP

mghoodlum

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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!


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Stroked777

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Casper, Wyoming
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!


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hmm im pretty sure that tank should get any pressure in at at all, they dont have a evap system like a gas vehicle has
 

mghoodlum

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Ok. Compression was good! Need more help!!!


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Stroked777

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Only thing I can think of that could possibly pressurize the tank is if compression is getting past the crush washer on the injector and putting compression into the return fuel line and bak into the tank
 

Nic

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^^ Wouldnt this show a compression drop in that cylinder to an extent or would it be so small that it wouldn't be noticeable on a graph? If this is the case, whatever psi is normal for a return feed, check it. If its higher than normal, then this would be sustainable. Have you seen this happen alot?
 

Stroked777

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^^ Wouldnt this show a compression drop in that cylinder to an extent or would it be so small that it wouldn't be noticeable on a graph? If this is the case, whatever psi is normal for a return feed, check it. If its higher than normal, then this would be sustainable. Have you seen this happen alot?

I know that the crush washers must be installed with the little ridge down. I have seen it pressurize a cooling system before but that was with the help of a cracked injector cup
 

mghoodlum

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Thanks guys. The fuel tank no longer has pressure or issue acting like it is out of fuel with 1/4 tank left. It now smokes on warm starts only and makes about 3-5 load knocking noises. It was actually doing this this morning and this evening has not done it except for a small puff of smoke on start up.


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