Ok Buckle up because this is a lot of information. 2006 F350 6.0 105k miles. A couple weeks ago I was driving home from a work trip and the truck felt like it was running out of fuel. I had just put a new sending unit in it 2 weeks prior so even though gauge showed just under 1/2 tank I pulled over assuming it was faulty. Had 4 gallons of diesel delivered by a friend and the truck fired right back up but was obviously. Misfiring. White haze smelled like diesel and threw an injector #3 contribution code. I unplugged the injector and the haze went away and drove about a mile to a gas station. Waited a while and it fired back up and drove onto the tow truck and drove off of the tow truck at my house. I ordered a new injector and the next day while waiting on shipping I decided to throw some injector cleaner in the tank and stiction eliminator in the oil on the slim chance it helps. I left the injector unplugged and used the block heater to help warm the truck up. Drove about 1/2 a mile around my neighborhood with the injector unplugged to try and get the truck warmed up without risking washing out the cylinder. Once oil and coolant temps reached 150 degrees I plugged the injector back in. Fired the truck up and no haze/white smoke but it was still Misfiring. Unplugged injector #3 while idling and no change to idle. Assumed injector was completely dead and drove home to park the truck. Half way home after about 1/4 mile of driving the truck chugged and died pulling away from a stop sign. Cranked but sounded like it was running on 4 cylinders. Towed back home and replaced fuel filters. Added an extra 15 gallons of fuel to make sure tank wasnt low. Sending unit now shows full tank. Tested fuel pressure at the bowl and got 65 psi. Performed a Buzz test 3x using a Jaltest. And all the injectors sounded the same. My IPR values while cranking are between 30-50% ICP pressure is reading 1200-2000 while cranking. FICM voltage is 48-49v while cranking. I got the truck to fire up once for about 10 seconds and it died out. I tested the FICM in another truck. I replaced the injector harness because the FICM connectors were kinda broken. Still about the same. Sounds like only a couple cylinders are firing. I checked for air bubbles in the secondary filter housing while cranking. I am currently out of ideas. I will hook a gauge back up and test fuel pressure again and make sure my HFCM is not having an intermittent issue. Im pretty lost. This is the first issue I have had with the truck and im getting annoyed. I have the new injector sitting in my garage but im not so sure its just an injector anymore and Im not going to just "throw parts at it". I tried to upload the video of the 1 time it fired up for a couple seconds but the file is too large. Im going to poke around some more all week and just looking for some direction.

 

Videos typically need to be posted on YouTube and then you post the link here.
So you have a fuel pressure gauge, but you do not have it permanently connected?
Have you recently checked fuel pressure at WOT type conditions (low pressure at high fueling rates can cause damage to injectors fairly quickly)?
At what operating conditions did you conduct the recent fuel pressure testing (65 psig)?

Unfortunately it is possible that you are having issues w/ the fuel tank pick up tube, AND perhaps more than one injector has been damaged from low pressure. Pickup tube breaking certainly can/does cause fuel supply and pressure issues at low tank levels, but if the tube breaks into small pieces, those pieces can plug the fuel line itself (or other fuel system components).

 

I got the video file compressed and uploaded. I tested fuel pressure when cranking but this was after the truck wouldn't run. No way to test WOT on a non running engine. And yes my fuel gauge is not permanently connected. I am aware that a low fuel pressure condition can take out injectors. I have no way of knowing what fuel pressure was when the truck did run.

 

When you bought the truck, the link I posted in one of your threads on buying it will take you to a thread that mentions installing a fuel pressure gauge immediately. It also mentions measure fuel pressure at WOT. I was hoping that that had been done. Guess not. IMO driving a 6.0L for over a year without continuous fuel pressure monitoring and a Sinister regulator spring is like playing Russian roulette.

Sounds like more than 1 injector may be needed (going on the statement that "it sounds like only a couple of injectors are firing"). Edit, I suppose it could be a FICM logic board issue as well, but probably not if it worked in another engine. Best of luck.

 

Well thank you, I appreciate your thoughts.

 

Hazing stopped when the injector was disconnected.

It sounds like you have a bad injector. Possibly a split tip or an internal issue. Low fuel pressure is not the only reason for an injector failure. An internal fault can allow combustion gas to enter the fuel rail, just as a burned copper ring can. I think you need to pull that injector, check the copper ring for damage, and replace it anyway, since you have it. Then go from there.

 

Yeah, thats what I was originally thinking until the no start condition. I have cranked with key off to check the fuel bowl for air bubbles and didn't get any. But that does not guarantee ny injectors are good. Like what Bismic said I could have lost more than just 1 injector from low fuel pressure but I would think it least one would push air bubbles into the fuel bowl. Im going to mess around with the HFCM today see if its got an intermittent issue that could have killed injectors. Even if my truck does need a whole set of injectors or even just 1 injector I need to figure out what damaged them.

 

Contribution code can come from other things

mechanical Or volume fuel it said FICM guide if I understood correctly


what are you reading code with

any live data
FPW? During crank

Seems to have gotten worse

is fuel delivery to fuel bowel aerated

 

All this started after you dropped the tank?

 

Yes... 314 miles according to trip meter. After towing home i replaced fuel filters in case I accidentally contaminated something. Keyd on like 10 times to prime fuel system and thats when I took the video of it firing up and then dying out. It threw p1378 code and I replaced the FICM relay and also decided it was a good idea to test FICM in another truck. I haven't seen that code since and it could've just been due to me cranking for 10+ seconds.

Today when I got home from work I hooked the gauge back up and was getting 65-69 psi while cranking. Attempted a couple times before throwing batteries on charger. Truck tried to start but battery level was low. Im currently live monitoring with my CTS3 but I have access to a Jaltest and I believe a buddy has an Autel scan tool. I have not got around to it yet but I will probably do an oil change in case the oil is contaminated causing stiction.

 

P1378FICM detects logic power low, less than 7 volts. Low batteries, loose connections/resistance in circuit, defective relay.

howsbatterys alternator and cables
Check LIVE DATA
volts
FICM Main
FICM LP
FICM VP
FPW

maybe FICM took hit idk someone mentioned it

 

Key-on 10 times to prime the fuel when cold will drain the batteries pretty good since the glow plugs would be recycling each time.

 

FICM was tested after code and new relay installed so nothing to worry about there. Like I said i cranked it for a long time and it probably was enough to draw batteries down and throw that code. Like I said I have not seen it since and I have been keeping the batteries topped off. Alternators are both good when trucks running it puts out 13.5 volts. Of course I could have a harness issue supplying the FICM and this afternoon I will monitor
FICM MAIN
FICM LP
FICM VP
FPW

While cranking and when its running.

I also decided to check my IAT sensor and it was nasty. I cleaned it up today with some electronics cleaner and it will be re-installed before testing.