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Thread: How to measure fuel pressure

  1. #1

    How to measure fuel pressure

    Is there an established way to measure fuel pressure on an XB (9SX)? If so, what is it specifically?

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    Senior Member d_adams's Avatar
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    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by nwguy View Post
    Is there an established way to measure fuel pressure on an XB (9SX)? If so, what is it specifically?

    Specifically...


    To prevent spray of fuel, purge system of high-pressure
    fuel before supply line is disconnected. Gasoline is
    extremely flammable and highly explosive, which could
    result in death or serious injury. (00275a)

    1. Remove air cleaner assembly. See 4.44 AIR CLEANER
    ASSEMBLY.
    2. Purge the fuel supply line of high pressure gasoline.
    a. See Figure 4-24. Disconnect the 4-place fuel pump
    connector [86]. The connector is located inside the
    left rear portion of the fuel tank/frame.
    b. With the motorcycle in neutral, start the engine and
    allow vehicle to run.
    c. When the engine stalls, press the starter button for 3
    seconds to remove any remaining fuel from fuel line.

    WARNING
    With fuel tank drained, gasoline can spill from bore when
    supply valve is loosened or removed. Gasoline is
    extremely flammable and highly explosive, which could
    result in death or serious injury. Wipe up spilled fuel
    immediately and dispose of rags in a suitable manner.
    (00277a)

    3. See Figure 4-25. Depress button (2) of fuel line connector
    and disconnect the fuel line (3) from throttle body inlet
    (1).
    4. See Figure 4-26. Attach FUEL PRESSURE GAUGE
    ADAPTER (Part No. B-45522) (2) to throttle body inlet
    (1).
    5. Connect the fuel line (3) to fuel pressure gauge adapter.
    NOTE
    See Figure 4-27. Verify that fuel valve (2) and air bleed petcock
    (5) on the gauge are closed.
    6. Attach FUEL PRESSURE GAUGE (Part No. HD-41182)
    (4) to fuel pressure gauge adapter (1).

    7. See Figure 4-24. Attach fuel pump connector [86] to
    main wiring harness.
    8. See Figure 4-27. Pressurize the fuel system.
    a. Start and idle engine to pressurize the fuel system.
    b. Open fuel valve (2) on fuel pressure gauge to allow
    fuel to flow down the gauge hose.
    c. Position the air bleed tube (3) into proper container.
    d. Open and close the air bleed petcock (5) to purge
    the fuel pressure gauge and hose of air. Repeat this
    step several times until only solid fuel (without bubbles)
    flows from the air bleed tube.
    e. Close the air bleed petcock.
    9. Open throttle and increase engine speed to 2500-3000
    RPM. Note the reading on the pressure gauge.
    a. If pressure is 49-51 PSI (338-352 kPa) then system
    is operating within limits.
    b. If pressure is not within limits, see Test 4.13 (Part 1
    of 2) flow chart after disconnecting pressure gauge.
    1
    WARNING
    With fuel tank drained, gasoline can spill from bore when
    supply valve is loosened or removed. Gasoline is
    extremely flammable and highly explosive, which could
    result in death or serious injury. Wipe up spilled fuel
    immediately and dispose of rags in a suitable manner.
    (00277a)

    10. See Figure 4-27. Turn engine off. Detach pressure gauge
    (4) from adapter (1).
    a. Open the air bleed petcock (5) to relieve fuel system
    pressure and purge the pressure gauge of gasoline.
    b. Remove pressure gauge from adapter.
    11. Detach adapter from vehicle.
    12. Connect fuel line to throttle body inlet.
    Last edited by 34nineteen; 12-03-2020 at 08:54 PM.

  4. #4
    Senior Member Cooter's Avatar
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    Hey man, is that copy/pasted right from the service manual you can get from Buellmods.com? The FREE one?
    Here?
    http://buellmods.com

    Thats so cool! I bet it has LOTS of good Buell specific info, if you read it.


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    Quote Originally Posted by Cooter View Post
    Hey man, is that copy/pasted right from the service manual you can get from Buellmods.com? The FREE one?
    Here?
    http://buellmods.com

    Thats so cool! I bet it has LOTS of good Buell specific info, if you read it.

    I also wrote a script to grab all of them and put them on my own server in case that site ever goes down...

    I'll share a link so anyone can grab them if requested. Maybe we could make it a sticky as a backup thing.

    P.S. Grabbed all the EEPROM's, too. :P
    Last edited by kz6fittycent; 12-04-2020 at 12:42 AM.

  6. #6
    Senior Member 34nineteen's Avatar
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    I’m pretty sure that buell mods is jetlees site. If I’m wrong he’ll pop in soon to correct me.

  7. #7
    Senior Member Cooter's Avatar
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    You wanna-be Mr. Helpy-McHelpsterpants?!?


    You're a jerk because your fridge is out of beer

  8. #8
    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by Cooter View Post
    You wanna-be Mr. Helpy-McHelpsterpants?!?


    You're a jerk because your fridge is out of beer

    No, thats not why I'm a jerk.

  9. #9
    Senior Member Cooter's Avatar
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    That darn padlock is really tough!

  10. #10
    Senior Member 34nineteen's Avatar
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    Quote Originally Posted by Cooter View Post
    That darn padlock is really tough!



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