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Fuel Pressure Regulator - how do I prime the fuel pump?

posted by  someone claiming to be Ron on  Tue Mar 23 00:21 CST 2004 [RELATED]

Hello - I need to put a fuel pressure regulator in my 1985 DL 240 series b230f and someone told me I have to prime the pump after I install it. Exactly how do I do that? Do I just hook up a wire from my psoitive battery terminal to the fuse? My fuse box cover says my "in tank fuel pump" is #4 and "main fuel pump" is #6. Do I connect a wire to both of them? When I take the old fuel pressure regulator off will fuel be constantly running out of the fuel rail or does it stop after a short time - what can I use to maybe plug it up for awhile?
Thanks for your help - Ron








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    Fuel Pressure Regulator - how do I prime the fuel pump?

    posted by  Jim Holst on  Tue Mar 23 04:30 CST 2004
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    last visit: Tue Jan 4 11:05 CST 2011
    [RELATED]

    If you have one of those hand vacuum pumps many DIY car buffs have, you can connect it to the vacuum nipple on the FPR, pump up a vacuum and the FPR will release pressure in the fuel line. You'll still get some fuel leakage but it won't be under pressure. This is handy when you go to replace the fuel filter also.

    If you don't want to try running the pumps to refill the fuel rail, you can just hit the start several time and eventually the fuel gets up there. My daughter just ran her 240 completely dry. I put in a gallon and cranked the starter several times and eventually it started. When I got to the gas station it took 15.6 gallons to fill!








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    Fuel Pressure Regulator - how do I prime the fuel pump?

    posted by  rstarkie on  Tue Mar 23 01:16 CST 2004
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    last visit: Fri Oct 24 10:14 CST 2014
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    You can relieve the pressure in the system by packing rags around a fuel fitting at the rail and slowly open the fitting allowing the pressure to be released and the fuel to be soaked up by the rags (dispose of them where there is no risk of fire). Once the pressure is relieved the fuel will not run out.

    I have never had to "prime" my fuel pump but if you want to run the pumps in your car you can simply run a jumper wire from fuse 4 to fuse 6. The pumps will run as long as the wire is in place.

    I would suggest lubricating the new Oring on the FPR to ease its insertion into the opening on the fuel rail.

    Randy








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      Fuel Pressure Regulator - how do I prime the fuel pump?

      posted by  someone claiming to be Ron on  Tue Mar 23 01:36 CST 2004 [RELATED]

      Thanks very much Randy - when I jump a wire from #4 to #6 where is the power coming from? Do I have a hook a wire to the battery and then to 4 & 6 or the power is already in fuse 4 or 6 or do I just turn the key in the on position when connecting between 4 & 6? I'm surprised my new fuel pressure regulator did not come with an o-ring (got it from volvo dealer) - is it ok to use vaseline on the o-ring?
      Thanks again - Ron








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        Fuel Pressure Regulator - how do I prime the fuel pump?

        uid 18083's pic
        posted by  lucid on  Tue Mar 23 07:58 CST 2004
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        last visit: Fri Oct 24 12:31 CST 2014
        [RELATED]


        when I jump a wire from #4 to #6 where is the power coming from?

        The power is coming from fuse #6.
        Fuses 6 thru 10 are *always hot* even with Key in pocket.
        Power to fuse #4 will run *both pumps* immediately.
        Power goes from the #4 Left (input ) fuse contact straight to Main Pump,
        and thru the fuse to the Tank Pump.

        Fuse #6 does "nothing* in LH 2.2 (Label is wrong)

        There is NO FUSE you can pull to kill the pumps (without also killing the injectors—so *everything stops*) Use the rag method.

        --
        Bruce Young
        '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.








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        Fuel Pressure Regulator - how do I prime the fuel pump?

        posted by  someone claiming to be JimL on  Tue Mar 23 02:55 CST 2004 [RELATED]

        No, you DON'T need to prime the pumps - they are self-priming.

        The proper procedure to relieve fuel line pressure is to pull the fuse for the fuel pump, then start the car and allow it to run until it stops.

        I don't think the FP uses an o-ring - its a hard connection.

        Simple unbolt and re-bolt process.








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        Fuel Pressure Regulator - how do I prime the fuel pump?

        posted by  rstarkie on  Tue Mar 23 02:11 CST 2004
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        last visit: Fri Oct 24 10:14 CST 2014
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        I am challenged when dealing with automovtive electrics- I am lucky they operate on low voltage/amperage or I would have fried myself years ago:-)

        I believe fuse 4 is powered all the time- what is missing is the ground so the intank pump does not normally run unless the relay provides the ground via the ECU (?). So all you need to do to run the pumps is connect a jumper wire from fuse 4 to fuse 6. You will hear them. But like I said I've never had to run the pumps after changing the fuel pressure regulator (Probably done it 6 or 8 times).

        Vaseline will work fine.

        Randy








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          Fuel Pressure Regulator - how do I prime the fuel pump? 200

          uid 18083's pic
          posted by  lucid on  Wed Mar 24 08:46 CST 2004
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          last visit: Fri Oct 24 12:31 CST 2014
          [RELATED]

          Randy,
          As I am always stealing your Brake Junction Block photo, let me offer you the following write-up on the Tank Pump fuse. You are the test subject, for something I might use as a "canned" response, if it will help someone.
          Let me know if it works for you, or assumes too much, confuses you, etc.
          -----------------------------------------------
          "Fun With The Tank Pump Fuse"

          The Tank Pump Fuse can be very helpful — that is, if your Brick is a 200 series, and you have a Test Light or a good Digital Multimeter.

          Depending on the type of Fuel Injection, the Tank Pump Fuse will be #4 (LH 2.2, 2.4) or #5 (K-jet, LH 2.0)

          When looking at the fuses, the unfused or "Hot" side is on the left, as shown below.

          Hot (+) side —*—<<—(FUSE)—>>— fused (–) side goes——> to the tank pump

          * Voltage at (or applied to) the Hot side goes DIRECTLY to power the Main Pump. (This point SHOULD normally be at +12V whenever the FI Relay is energized.)

          At the Fuse Holder, you can:

          • Verify Fuel Injection (aka Fuel Pump) Relay operation (Test Light or Voltmeter on Fuse 4 input)
          • Test ("hot wire") either Fuel Pump (or both, with fuse 4 in place. Get +12V from fuse 6 input side)
          • Use the hot wire as a No-Start diagnostic, or to run pumps for pressure tests, etc.
          • Measure each pump's Current "draw" (requires Ammeter function, 10 amps max is OK)
          • Test and measure the O2 heater resistance (LH 2.4)

          --
          Bruce Young
          '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.







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