Voltage at fuel pump

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  • martinws
    S2Forum Maniac
    • Oct 2008
    • 917
    • Country: Scotland

    #1

    Voltage at fuel pump

    I put a Bosch 044 pump into my 90 the other day and linked a voltmeter to it and went for a drive. I get just about 12.2v is this to low for the pump? I'm thinking about running a new pos feed to the pump and using the original wiring to pull in a relay under the back seat. Any advice?

    This is a typ85 so it's an inline pump under the rear ns seat.
  • Sleeper_Avant
    S2Forum Fiend
    • Mar 2009
    • 2372
    • Country: England

    #2
    i always like to see 14v at the pump, make a harness to run via a relay, i can make a diagram if you want

    Sean.
    1993 URS4 Avant Emerald Green 350+bhp
    1991 Ford Sierra Sapphire 4x4 in Magenta
    BoooOOOSSSSSTTTT BANG BANG CHIRP CHIRP

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    • UrS4boy
      S2Forum Obsessed
      • Feb 2006
      • 11859
      • Country: Canada

      #3
      Here is a story and a DIY that might help you:

      The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
      RS2'd 93 UrS4 5 spd sedan
      94 UrS4 V8 6 spd manual avant

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      • caterpillar
        S2Forum Fiend
        • Jun 2004
        • 2480

        #4
        first; change the voltregulator in the generator to 15v ( alt 14,8) THEN you may fix the low volt to the fuelpump....all the electikal in the car will bee better;and fuelconsumtion too, better lights etc

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        • Error404
          Super Moderator
          • Mar 2007
          • 19789
          • Country: United Kingdom

          #5
          do you have a part number for a 15v Bosch regulator?
          Panthero Coupé quattro 20vt
          Indigo ABY coupé
          Imola B6 S4 Avant

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          • Smiley
            S2Forum Addict
            • Jun 2005
            • 329
            • Country: Germany

            #6
            BOSCH 14,5V 1 197 311 028
            HELLA 15,0V 5DR 004 246-331
            Meyle 15,0V 014 731 1090
            Last edited by Smiley; 27 August 2012, 12:27. Reason: more numbers :-)
            '93 Audi S2 Avant panthero black, 412.000km
            '94 Audi S4 C4 Avant 303Tkm, KW, Brembos, BN-Pipes, Bose, S6 front (sold)
            '93 Audi S4 C4 Avant, 260Tkm
            '88 Audi 100 Avant turbo 44Q
            '84 Audi 80 quattro tornado red
            sigpic

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            • AndyP
              S2Forum Zealot
              • Feb 2004
              • 6049
              • Country: England

              #7
              Originally posted by Error404
              do you have a part number for a 15v Bosch regulator?
              Have read of this thread:-

              sigpic
              1991 Audi S2 3B - 2.5 Stroker engine
              1997 A6 2.5TDi quattro avant - C4
              1976 RD250E / 350LC cafe racer

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              • Error404
                Super Moderator
                • Mar 2007
                • 19789
                • Country: United Kingdom

                #8
                Cheers for the link Mr P
                Panthero Coupé quattro 20vt
                Indigo ABY coupé
                Imola B6 S4 Avant

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