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  1. Mxz8002003

    Lb7 no start??

    So got about 100 miles on it, runs awesome. Ive own this truck for prob 8 plus yrs now and have put less than a 1000 miles on it. I think its time for the 29,000 miles to increase. These 100 miles i put on were very enjoyable. Motor is very quite for an lb7. But if im going to keep driving it...
  2. Mxz8002003

    Lb7 no start??

    Okay just got the truck back together, fired up after about ten seconds of cranking. Let it run for about ten mins, sounds good, shut it off and started it a couple times with no problems.. first initial look over my work, i see no leaks, everything looking good. Will do a better in spec...
  3. Mxz8002003

    Lb7 no start??

    Yeah i prob could do that.. im curious myself. With pump out and i spin gear by hand fuel only came out of return. I held finger over supply inlet, spun gear around few times the. Their was suction on my finger. Removed finger and Little bit of fuel shot up and out of return only. Obviously...
  4. Mxz8002003

    Lb7 no start??

    Also BdSankey thanks For the quotes and input on different cp3’s.
  5. Mxz8002003

    Lb7 no start??

    Okay so got the lb7 torn down tonight to be able to get cp3 out. 3 1/2hrs and 4 brewskis. Not bad i didnt think. (Tare down is easy right) I dont think it will be to bad going back together. No doubt my Previous Encounters with doing injectors on the lb7 helped me tonight. Although you...
  6. Mxz8002003

    Lb7 no start??

    Absolutely!! Thanks 2004lb7
  7. Mxz8002003

    Lb7 no start??

    I took the rubber supply line off at the cp3. Which from the outside looks fine. When i removed it fuel come out of the line. I then hit the primer a feel times and a full hose of fuel each time i pumped came out. Hooked the rubber supply line back up to cp3. next remove the Short high...
  8. Mxz8002003

    Lb7 no start??

    Sry if that came across confusing. Okay no lift pump. Cp3 is gear driver. so no Electronic item like the Main computer could stop the pump from pumping fuel right?? And then my fuel Filter primer head. If it will prime and pump fuel manually when i pump it, which it does, then should it...
  9. Mxz8002003

    Lb7 no start??

    Sry guys i just keep think of sh*t and want to be sure. So i know my fuel had is pumping good Threw test port. When i rebuilt the fuel head i also add the injectors direct cat filter adapter. Says no primer ball removal. Want to be sure if the fiter head will pump fuel then does that mean...
  10. Mxz8002003

    Lb7 no start??

    Question, is it work have the guy still stop over with computer?? I know what actual rail pressure will read now. But is demand important? Is their something electronically that can make the cp3 noT pump?
  11. Mxz8002003

    Lb7 no start??

    Okay just got home, all ive done so far is first look at supply rubber line to cp3. Look good. So then crack last injector line on passenger side rail and cranked, no fuel. Loosen some more cranked, no fuel. Removed flare nut slid up line, had open rail, cranked and no fuel what so ever. Will...
  12. Mxz8002003

    Lb7 no start??

    2004lb7 okay makes since About the pressure line. I will have to check the rubber supply To the cp3. I know im getting fuel to at least the shredder valve test port because i pump fuel into a mason jar with the hose down into the fuel to see if i was pumping any air and i was not. With the...
  13. Mxz8002003

    Lb7 no start??

    Possiable have someone coming over with a computer tonight, i hope its one that can do everything i need it too. Which is my next question. What to test or see with the computer, actual and desire rail pressure.. anything else for now??
  14. Mxz8002003

    Lb7 no start??

    Thanks, im bumming its dead right now, unfortunately the low miles i am feeling may have lead to this problem. Alot of sitting... No truck ran fine 6 weeks ago, cranked a little longer than normal but my battery's were low. When i say ran fine it idle for 2hrs. No codes, no smoke, smooth as...
  15. Mxz8002003

    Lb7 no start??

    Also did paper towel test and looks good, appears no fuel in oil. I certainly Dont think their would be high pressure leak under valve covers.
  16. Mxz8002003

    Lb7 no start??

    Okay just pulled all 8 glow plugs, did one bank at a time, no fuel come out of any of them while cranking
  17. Mxz8002003

    Lb7 no start??

    Thank you I will try that, i believe the hard starting before was due to cranking slow Because of bad battery. I did pull all glows plugs after trying to start it numerous times Prior when trying other things and all were dry.. didnt think of cranking it over while they were out. My fuel...
  18. Mxz8002003

    Lb7 no start??

    Tried my ficm on uncles duramax today, started right up couple times. So ruling that out..
  19. Mxz8002003

    Anyone near Boyne city,mi with techll or efi

    Could use help with a no start issue on lb7. Wanting to check fuel rail pressure. Please let me know, would be willing to pay for your time. Thank you
  20. Mxz8002003

    Head gaskets or something else?

    Its possible you could have an injector cup leak. Ive seen it on my old mans lb7, though it was hg end up being a couple cups..
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