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  1. #1
    Just a bit of BOOST
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    Bosch part high pressure fuel line

    I'm having some misfire during driving and was looking at the fuel injection components and noticed a round Bosch part on the high pressure fuel line just before it goes into the fuel rain. Anybody know what it is?

  2. #2
    OVER-BOOST!! gbeaird's Avatar
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    SVO's: '86 2R
    Held on with three bolts? That's the fuel pressure regulator.
    Gene Beaird,
    86 2R SVO, G Stock,
    Pearland, Texas

  3. #3
    Just a bit of BOOST
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    No, it's held on with one bolt. It's before the fuel pressure regulator. it's inline on high pressure line. Held in place by the dipstick bracket at back of throttle body.

  4. #4
    Just a bit of BOOST
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    It's a round, metal, device with one threaded bolt on the bottom.

  5. #5
    Administrator SVOeric's Avatar
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    SVO's: 86-1C & 86-1E
    that is a fuel pressure equalizer. supposed to 'smooth' out the pulses from the fuel pump.
    I've taken mine off, as they are a good place to develop leaks.. I've never noticed any difference.
    Eric C
    SVOCA Webmaster

  6. #6
    OVER-BOOST!! svono50's Avatar
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    SVO's: 86 1C
    That is the fuel pulse dampener, basically a small reservoir intended to dampen out the fuel system pressure spikes from the batch firing of the injectors. There isn't much going on inside of the dampener other than it being a pressure tank of sorts. If the diaphragm inside leaks/bursts, you really just end up with a solid chamber and loose much, if not all, of the dampening function of it. The engine will run with it removed, you pull the dampener assembly out and move the fuel line up onto fuel rail, as it has the same connector size/type. I removed mine for a short while many moons ago trying to diagnose something myself, which is how I know.

    Click image for larger version. 

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    Ted
    86 SVO Mustang
    17 Cooper S Clubman ALL4

  7. #7
    Just a bit of BOOST
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    Thanks, really appreciate the quick reply's

  8. #8
    OVER-BOOST!! gbeaird's Avatar
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    SVO's: '86 2R
    Interesting. Sorry for the mistake, apparently the one for our car was long gone before we got it.
    Gene Beaird,
    86 2R SVO, G Stock,
    Pearland, Texas

  9. #9
    OVER-BOOST!! svono50's Avatar
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    SVO's: 86 1C
    svoman, glad to help.

    Gene, yours wouldn't be the first I have seen with it removed/missing. There was a misnomer about these causing issues with fuel flow, pressure, etc and for a while I remember folks pointing fingers at them quite often. From my experience the fueling issue generally lies elsewhere in the system, since the dampener is basically a mini expansion tank like you use on your hot water heater and hot water boiler feed lines.
    Ted
    86 SVO Mustang
    17 Cooper S Clubman ALL4

  10. #10
    OVER-BOOST!! gbeaird's Avatar
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    SVO's: '86 2R
    It's also possible it got a bad name since it's known as a 'pulsation damper' and the ones on the RX7s being notorious for leaking, often causing a carbecue!
    Gene Beaird,
    86 2R SVO, G Stock,
    Pearland, Texas

  11. #11
    Administrator SVOeric's Avatar
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    SVO's: 86-1C & 86-1E
    leaking is why mine was removed. -- more connections = more points to leak.
    Eric C
    SVOCA Webmaster

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