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04 3500 Dmax, Dual Fuel tank Problems???

Discussion in 'Chevy Trucks' started by Mike S, Nov 20, 2008.

  1. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    The fuel gauge quites working and when it does it loses prime. I installed a new lift pump and it didnt solve anything. Help!!! The gauge will stop working and then start working again and when it starts working again it will also lose prime. It codes when it does it! Tomorrow I will get it scaned. Anyone have this problem?:help:!!!!!
     
  2. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    Never mind took a wild guess and bought a new float for the back tank and that seemed to work.
     
  3. blowerman

    blowerman PlowSite.com Addict
    Messages: 1,262

    I hope you don't fuel up with the truck running... Non stop problems with our older dual tank duramax trucks.
     
  4. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    Never mind it did it again!!!!!!!!!! Still have same problem! HELP!
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    You changed the wrong sending unit Mike. It needs the front one. :nod:
     
  6. Riccas

    Riccas Member
    Messages: 60

    Duramax engine doesn't have a liftpump to begin with... its got CP3s which is a motor driven suction pump, not a lift pump, so you might want to start in the tank if theres a fuel sending issue. Also what config do you have that you have dual fuel tanks?? I've owned every year duramax from 01-07 and none of them have dual tanks on my 3500's regarless of cab config or bed option.
     
  7. Riccas

    Riccas Member
    Messages: 60

    Duramax tanks are suposed to operate on weight sending... not float sending... interested to know what kind of tanks are on there...
     
  8. blowerman

    blowerman PlowSite.com Addict
    Messages: 1,262

    02, 3500 one ton dump has dual tanks. The dealer says the back tank fills the front and then the front goes to the engine? Correct me if that's wrong.
     
  9. bowtie_guy

    bowtie_guy Senior Member
    Messages: 551

    Correct!! :)

    Cab and Chassis trucks come with dual tanks. :D
     
  10. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Correct, the PCM reads the fuel level on BOTH tanks and by way of the frame mounted transfer pump (what I think Mike was referring to as a "lift pump") it pumps fuel from the rear tank to the front one as its used...as the engine only pulls fuel from the front one. If the PCM gets an erroneous reading (or none at all) from either tank it can cause all sorts of strange issues.
     
  11. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    B&B what do you recomend I try next?
     
  12. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Replace the front sender assembly Mike.

    They're usually the ones that die most often anyway. :nod:
     
  13. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    Thank you!!!!
     
  14. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    Ordered the front sending unit and will have it in by noon tomorrow! Lets hope for the best!
     
  15. sjosephlawncare

    sjosephlawncare Senior Member
    Messages: 284

    My 04 C&C did that when it was new, Jack Maxtons replaced the front sender(under warenty) and it never did it again. It was very fustrating when it did that, left me stranded a couple of times, cause I didn't know what to do.
     
  16. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    Awsome! Thats funny Maxton didnt even want to look at it! Oh well! That makes me feel better that the sender could probably fix my problem! Thank you! Who's the chick in the avatar?!?LOL!
     
  17. sjosephlawncare

    sjosephlawncare Senior Member
    Messages: 284

    Maxton is the only place I trust anymore, that's funny. They have mixed reviews I guess. some hate em, some love em- oh well. That's beth o., howard sterns new wife.
     
  18. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    Wow she hot! I bought my 04 2500hd from them and they didnt treat me bad but they didnt fix the over heating problem that the truck had with the meyer that I bought from them. The wrong fan clutch was on it! Oh well! Maxton was not bad on thier selection but I think I like Byers selection better. My duramax I have now was a repo that had 40000 miles on it and was agreat deal! I think im done buying new trucks for a while unless I see a red or blue 3500 Dmax 4x4 SRW utility body truck!
     
  19. Mike S

    Mike S PlowSite.com Addict
    Messages: 1,588

    Problem fixed for now!! Front sender! Thanks!
     
  20. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Congrats Mike...and your welcome. :waving: