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A4 2.5 TDI - LIFT PUMP

Discussion in 'A4/S4 forum(B5 Chassis)' started by diesel1998, Dec 23, 2010.

  1. diesel1998
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    diesel1998 diesel1998

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    [Dec 23, 2010]
    Anyone have a source for the lift pump in the fuel tank?

    1998 Audi A4 Saloon 2.5 TDI - Tiptronic
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  3. murran
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    murran Active Member

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    [Dec 24, 2010]
    has it packed up? is it working when powered up at the in-tank component?
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  4. diesel1998
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    diesel1998 diesel1998

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    [Dec 24, 2010]
    The lift pump is completely dead. Does not pump anything, needs to be replaced.
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  5. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Dec 24, 2010]
    If your checking for fuel at the engine, you wont get anything.

    The electric pump on the 6 cylinder diesel is only used to move fuel from the various "sections" of the tank, into the swirl pot. The injector pump up front "sucks" the fuel from the swirl pot, so at no point will you see any fuel coming out the feed lines with the IP disconnected.
    #4
  6. murran
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    murran Active Member

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    [Dec 24, 2010]
    ^^^ thats true actually!
    is the injection pump knackard?
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  7. diesel1998
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    diesel1998 diesel1998

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    [Dec 24, 2010]
    The injection pump died. Replaced with a rebuilt, but after running for a while still get a code and goes into limp home mode.

    Code is "start of injection regulation"

    Any suggestions on what may be causing code? Found some suggestions on the web that faulty electric pump may be the cause.
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  8. adamss24
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    adamss24 Well-Known Member

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    [Dec 25, 2010]
    The pump might be faulty or is incorectly adjusted- needs adjusting/setting-up with the computer and full VCDS ! Where abouts are you based ? Can you make-it to N. London ? I could set the pump for you...
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  9. murran
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    murran Active Member

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    [Dec 26, 2010]
    if its timed up correctly, then thats a pump fault. the pump can (or should be able to....) advance and retard the start of injection point in relation to running conditions. im guessing it cant or doesnt have the full range the ecu thinks it should have.....

    we sent one off to a company down south somewhere was off a '98 manual quattro (the car didnt run). it came back "rebuilt", the car now started.... but had this, or a v similar sounding fault code. was also really "flat" to drive. we sent the pump back to them and on second try was fine

    you need to get it on the computer check the set up, and check its working.
    Last edited: Dec 26, 2010
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  10. diesel1998
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    diesel1998 diesel1998

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    [Dec 27, 2010]
    One small detail....the garage isn't experienced with the 2.5 tdi. I'm in the US and we have the 1.9 TDI jetta's and passats.
    I recall the mechanic saying the timing was set about 14 ATDC. I see in ELSA software timing should be 2 ATDC.

    Should the VAGCOM have the correct range in the software?
    #9
  11. adamss24
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    adamss24 Well-Known Member

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    [Dec 27, 2010]
    If he's got the VCDS then its a doddle to set the pump, measuring block 04 in the engine controller, click the bassic settings button then click on the Tdi timing on the right hand side of the screen then select the engine code from the drop down box. The timing should be above the blue line towards the top of the green line. If the timing is right then the computer will tell you if its within spec. I tend to keep-it towards the top, makes the engine slightly noisier but its a bit more powerfull and returns better fuel ecconomy !
    #10
  12. murran
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    murran Active Member

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    [Dec 27, 2010]
    if its not in spec, then it will need adjusting. you adjust the timing by adjusting the drive belt pulley for the pump belt on the n/s cam pulley. the three 6mm allen bolts have slotted holes.
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  13. diesel1998
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    diesel1998 diesel1998

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    [Jan 11, 2011]
    Problem solved. Used murran's advice and adjusted the timing at the pump and cam. Runs great. No more limp mode.
    #12

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