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re fuel pump

brent 3045 Sep 21, 2012

  1. brent 3045

    brent 3045 Member

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    Anyone know what kind of updated fuel pump will fit my s3 amk
     
  2. Paradox1

    Paradox1 Active Member

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    Walbro 225 I think.it depends what power your expecting to run. I think that would do.

    Now lets wait for tuffty to tell me im completely wrong and that I shud go back to the vw forums!
     
  3. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Depends on what you are planning to do and your level of tune... a std S3 pump is a 4bar one and perfectly capable of supplying fuel to low 300's hp wise... most are tired nowadays though so if you think its tired then swap that for a new one in the first instance... if going for BT power then fit an inline pump like a DA 31 (details in my build thread)

    <tuffty/>
     
  4. brent 3045

    brent 3045 Member

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    Wot about a gss340? Would that fit? Just goin for under 300 power on k04. Had it on rollers and suggests tired pump, running really lean.
     
  5. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    stick to OEM for intank....,

    <tuffty/>
     
  6. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    lean as in falling fuel pressure not following boost yea?
     
  7. Westy

    Westy Well-Known Member

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    I'm hoping mine will be ok for 300ish on 550cc injectors. It's a brand new VW part in tank but I have a feeling my next purchase may be an inline.

    Does it make much difference to the strain on the OE pump with larger injectors or is that governed by the FPR? I'm guessing that the pump will be a lot happy with a 3bar FPR and 550 injectors then my current setup of 4 bar FPR and stock injectors working their nuts off!?
     
  8. Paradox1

    Paradox1 Active Member

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    Westy how much is a new fuel pump for an s3?I don't want to buy a second hand one that could be tired
     
  9. Westy

    Westy Well-Known Member

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    I got mine through Jason on here and it was around £170 if my old memory serves me well?!
     
  10. brent 3045

    brent 3045 Member

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    He said it was boosting at 1bar but just running really lean. I don't really know. Is there something I can ask him to help diagnose it?
     
  11. Paradox1

    Paradox1 Active Member

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    Wow,no wonder people get second hand ones lol,cheers
     
  12. Westy

    Westy Well-Known Member

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    That was mates rates too. I'm sure they're closer to £200+ :faint:
     
  13. Paradox1

    Paradox1 Active Member

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    Lol that's shocking! The list of upgrades just gets longer and longer
     
  14. Westy

    Westy Well-Known Member

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    Yep. There's a lot of things people don't account for until they start modding and they start killing off old components or maxing out their capabilities.
     
  15. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Logs would be useful as would simply fitting a fuel pressure gauge to the fuel rail and seeing what the actual pressure is :)

    <tuffty/>
     
  16. brent 3045

    brent 3045 Member

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    He did fit the fuel gauge to the fpr. That's how he noticed it. Is there anything else it could be? He said either pump or crimped fuel lines
     
  17. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Unlikely... they should make just under 3bar on idle/vacuum rising with boost so you should see 4bar fuel pressure... assuming the gauge has bee fitted to the feed and not the return of course :)

    <tuffty/>
     
  18. brent 3045

    brent 3045 Member

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    He fit it to the vacuum hose goin to the intake manifold. So would that read it correct?
     
  19. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    ????? what??? to measure fuel pressure you connect a fuel pressure gauge in the fuel line...

    <tuffty/>
     
  20. brent 3045

    brent 3045 Member

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    Oops, I don't really know mate. I just seen a hose comin off fpr a tpieced t gauge. I'll ask him to test fuel pressure n let u no
     
  21. Westy

    Westy Well-Known Member

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    That'll be your turbo boost rating mate.
     
  22. Paradox1

    Paradox1 Active Member

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    That's what I would have thought.tuffty this is all new to me but supposed I did want to test my fuel pressure what's the best way to go about it?
     
  23. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Bill uses a bit of kit like this...
    [​IMG]
    OTC 5630 Fuel Pressure Test Kit : OTC

    Have to plumb it in with a t-piece so it can read pressure... then you would use a dyno to load up the engine to see what the pressure is :)

    Bit too dangerous to do on road logging...

    <tuffty/>
     
  24. Squirrelofdoom

    Squirrelofdoom Member

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    errr, bit of a hijack here - apologies, didn't seem worth it to start a new thread though.

    I've got fuel pump issues on mine; struggles to charge on less than like 1/2 tank of fuel - tired pump I think. Do people buy used ones at all? Is this the right part? AUDI S3 A3 8L Fuel Pump And Sender Unit Offside 1997 - 2003 | eBay

    Thanks guys,
    Aran
     
  25. Paradox1

    Paradox1 Active Member

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    Thanks tuffty Mr VAG guru.

    Id advise just taking the plunge and getting a new one mate,you never know If the used one you buy is knackered
     
  26. Squirrelofdoom

    Squirrelofdoom Member

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    hmmm, fair enough - i've replaced so much on the car - gonna be brand new when i'm done with it lol :)
    anyone got a part number?
     
  27. brent 3045

    brent 3045 Member

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    been to the garage this morning, he told me he never plumbed anything to read the fuel pressure, hes just goin off the dyno, af ratio. he said if its running lean, becasue not enough is comin thru it could only be the fuel pump or regulator. the new pump has come today anyway so hes fitting it. ill let you know the results later today after dyno runs and map
     
  28. BuuBBa

    BuuBBa Member

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    Has anyone fitted the Walbro 400LPH intank pump?
    LINK

     
  29. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    tbh I wouldn't bother 'upgrading' the intank... if you need more fuel than a std intank and an inline DA 31 can provide then you are better off fitting a swirl pot and might have to go up a size on the fuel lines...


    Bill runs dual 044's on his Ibiza...

    <tuffty/>
     
  30. brent 3045

    brent 3045 Member

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    i picked up a wss340 for half the price of the standard s3 one, decided to go that way, mechanic said would be easy to make fit. that way if i wanted to go bigger turbo at some point would make more sense just to get one to start with
     
  31. brent 3045

    brent 3045 Member

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    Had pump replaced, solid fuel pressure now to have it put in rollers and find out ecu is corrupted. Hopefully this will solve the issues
     
  32. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    you have not ever checked your fuel pressure so how can you say this?
    lean as logged from dyno but what about what cars logged itself??? Stock map is 0.953lambda under wot.. Is this what his dyno also saw? If so, its what a std map will do up to 920c egt's where it will fuel dump
     

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