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Disabling Fuel Pump V70-XC70 2000

posted by  e21Pilot on  Fri Jun 19 02:25 CST 2015
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last visit: Sat Sep 27 01:59 CST 2014
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I see the handy Schraeder valve on the fuel rail of my 2000 V70 XC SE. That's nice that the Volvo engineers were thinking of me. This makes it easy to hook up my fuel injector service tool to clean the injectors while running the engine.

Only thing I need to know now is how to disable the fuel pump while I am running the service on the injectors? Is there an easily accessible fuse or relay or connector to pull for doing this?








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    Disabling Fuel Pump V70-XC70 2000

    posted by  KlausC on  Fri Jun 19 09:23 CST 2015
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    last visit: Fri Oct 24 10:15 CST 2014
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    Pulling the fuel pump relay is the easiest way to disable the pump.

    How are you going to pour the 'cleaner' into the system at a constant 40psi and have the engine running? Some of the 'cleaner' will be forced through the pressure regulator and back to the gas tank.

    With most of the gasoline brands, cleaners are already present, making the injectors reasonably clean even after 200K miles. The only time I ever had problems with injectors was with a 25 year old car that was a driveway queen for 4 years (not started). I pulled the injectors and had them professionally cleaned after determining that one of the injectors was leaking and another was not spraying correctly.
    --
    My back feels better when I sit in a Volvo seat








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      Disabling Fuel Pump V70-XC70 2000

      posted by  e21Pilot on  Fri Jun 19 11:39 CST 2015
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      last visit: Sat Sep 27 01:59 CST 2014
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      I should have provided more details: I use an injection service tool that is air pressurized to push the cleaner into the fuel rail. I run the pressure a little below the FPR psi so that the cleaner does not get pushed back in the fuel tank by the FPR. The cleaner is combustible so the engine idles while the cleaner runs through the injectors and cleans the backs of the valves also. Only trick is to disable the fuel pump so it doesn't compete with pressure from the service tool.

      Surprising what a service like this does to improve the running on some engines. Not sure if some engines build up deposits because of their design, the ethanol in the fuel or some combination. It will be interesting to see what happens on the V70 (170K miles).








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        Disabling Fuel Pump V70-XC70 2000

        posted by  e21Pilot on  Sat Jun 20 02:44 CST 2015
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        last visit: Sat Sep 27 01:59 CST 2014
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        To close the loop on this, the service went well. The Schraeder valve on the fuel rail took the same service fitting as a typical Ford. I ran the service tool pressure at just 30 PSI and the V70 idled nicely during the 20 minute service.

        The result? Slightly smoother idle and a noticeably quicker start. Not sure if the mileage was affected or not.

        Been doing it on my trucks for years with good results so I thought I would try it on the V70.








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    Disabling Fuel Pump V70-XC70 2000

    posted by  B.B. on  Fri Jun 19 06:18 CST 2015
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    last visit: Mon Oct 6 13:15 CST 2014
    [RELATED]

    How will you run the engine without the fuel pump? Do you plan to spin the
    engine with the starter?

    I don't have the V70 wiring diagram here
    But on the 850 You can yank F2, or the Fuel Relay 2/23
    or unplug the fuel pump.
    There might be confusion with the main fuel relay 2/32 that enables the
    positive legs to each injector- That one does not kill the fuel pump.
    2/23 is in the main fuseblock and 2/32 is above the radiator
    The wiring diagram gives component locations for your car.

    The easiest way for you is to pull the fuse, BUT
    You need the right wiring diagram for your model to be certain your model
    is the same scheme.
    It should be available in a PDF format.
    Search for "2000 volvo v70 wiring diagram"

    Bill







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