LB7 runs and drives, Doesnt start unless primed. Dealer says injectors
- Thread starter mriley
- Start date
I'm located in Queensbury NY. I'm currently driving the truck on my way to Enfield CT where I live part-time. The truck is going to stay down there until I can figure out what to do.
by the way, im currently driving the truck as a type this to CT. i have with me, plugged in, one of those simple 200 dollar autozone scanners. any info you guys would like me to post that might be relavent? im not towing, crusing at 70mph. absolute fuel rail pressure is fluctuating between 15 and 18k depending on grade. MAF reading fluctuates between 19 and 22. MAP reading fluctuates between 32 and 34
Making oil? Do you mean leaking oil? Not that I'm aware of, but iI haven't climbed underneath her in awhile so its possible..
scanner does not read balance rates, in fact the information I provided is pretty much the extent of what it tells me, not much more relevant info on there
have no noticeable loss of power, the truck doesn't shake, dump black smoke, lopy idle, no abnormal sounds
Going to CT with it huh? I'm not far from Queensbury NY (about an hour west of there). If you don't figure it out I will take a look at it with you.
Making oil means that are you getting fuel in your oil. Check your oil after putting some miles on and see if has more then before.
Aaron, if things don't work out I will absolutely take you up on that offer. Johnsville isn't far at all. It truly is a beautiful truck, literally not a spot of rust anywhere, not even bubbling. Under the door jams, in the cab corners, over the wheel wells, even on the bottom of the tailgate theres none. Its just a shame that the integrity of the motor doesnt match the body. A damn shame
If it will only start if you prime the filter head......how are you guys deducting injectors?
the filter doesn't go directly to injectors....it goes to the pump then injectors. The system does not store pressure in the lines when shut off.
It is some sort of air leak before the pump, more than likely the filter head itself. If you changed the filter lately, check there too.
the filter doesn't go directly to injectors....it goes to the pump then injectors. The system does not store pressure in the lines when shut off.
It is some sort of air leak before the pump, more than likely the filter head itself. If you changed the filter lately, check there too.
i I have replaced the fuel filter, replaced the WIF sensor, and rebuilt the O-rings in the fuel filter head. Than when i dropped it off at adirondack truck repair those goons did the exact same thing, even after i told them what i had done. Sure enough he threw a new fuel filter on, and rebuilt the fuel filter head also. I'd like to say its not the fuel filter head but I'm no pro.
I got home a little while ago, drove almost 3 hours, even brought it to WOT once just to see if that would do anything. Parked it in the driveway, shut it off and went to start is back up immediately and it still needs to be primed while cranking, amazing
I got home a little while ago, drove almost 3 hours, even brought it to WOT once just to see if that would do anything. Parked it in the driveway, shut it off and went to start is back up immediately and it still needs to be primed while cranking, amazing
I would try and pressurize the fuel system from the tank and check for leaks.
Follow all the hoses under truck and look for kinks, twists, anything out of the ordinary.
No sense in throwing 2k worth of parts at it just to see if that's the issue.
Follow all the hoses under truck and look for kinks, twists, anything out of the ordinary.
No sense in throwing 2k worth of parts at it just to see if that's the issue.
mriley, did you ever check to see if you were ACTUALLY losing prime? Remove the bleeder screw and pump the primer till fuel comes out. Then pump the primer till the truck starts. Once the truck has been running do the same procedure. If you notice more air in the filter again then you likely have a prime issue. If you have full fuel at the bleeder screw but it still wont start, then you do not have a prime issue.
what happens is after getting it running and shutting it off, the primer is soft again and needs to be pumped back up. i dont even want to touch the bleeder screw at this point because atleast right now it starts, as it sits i can sell it because it runs fine. i can tell you that before i dropped it off at adirondack truck repair i couldnt get it to start at all, i must have bled that thing 100 times and couldnt get it to start, so i had it towed over to them where he was atleast able to get it to start every time
How are they getting it to start every time? They aren't using starter fluid I hope!
The CP3 may be getting weak and the part of the pump that pulls the fuel from the tank, though the filter, and up into itself may be wearing out. By adding a primer pump, like a FASS system, you will assist the CP3 pump and may get it to run a little longer. Typically the fuel system is good for 150,000 miles.
Had a friend with one fighting a slow start/no start condition. It would spin and spin but would not start. IT sounded like it was spinning over a little lazy and it would reset the Tech2 when starting. Went over the battery terminals and found one of the cables loose. Cleaned and tightened them and it spun faster and started right up .. Spinning slow and would not build RP..