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fuel pressure gauge bouncing

Discussion in 'Peterbilt Forum' started by beemergary, Apr 12, 2015.

  1. Apr 12, 2015 #1
    beemergary

    beemergary Light Load Member

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    Apr 11, 2014
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    Took my playtoy with a 3406b for a ride today. The new gauge always bounced alittle @ 40#. Today was going crazy between10-50. Was waiting for the needle too fly off. Does it need to be bled or something. Thought I'd ask before calling Autometer. Thanks
     
    beemergary, Apr 12, 2015
    beemergary, Apr 12, 2015
    #1
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  3. Apr 12, 2015 #2
    Ridgeline

    Ridgeline Road Train Member

    20,729
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    Dec 18, 2011
    Michigan
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    It needs a damper on the gauge, you can make one with a needle valve put in line between the isolator and gauge.
     
    Ridgeline, Apr 12, 2015
    Ridgeline, Apr 12, 2015
    #2
  4. Apr 12, 2015 #3
    Epmtrucks

    Epmtrucks Medium Load Member

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    Mar 31, 2013
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    Change the fuel filter and see what happens. Is it spoiling up normally?
     
    Epmtrucks, Apr 12, 2015
    Epmtrucks, Apr 12, 2015
    #3
  5. Apr 12, 2015 #4
    beemergary

    beemergary Light Load Member

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    Its a mechanical gauge. Truck runs fine. The needle bounces so fast its a blurr.
     
    beemergary, Apr 12, 2015
    beemergary, Apr 12, 2015
    #4
  7. Apr 12, 2015 #5
    Epmtrucks

    Epmtrucks Medium Load Member

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    Mar 31, 2013
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    I ran a 7fb 350 and now a 4ck 460 and changing filters seemed to help. I run high efficent filters and they seem to restrict fuel flow after 1200 to 1300 gallons. It caused fluctuations in fuel pressure and tubo boost.
     
    Epmtrucks, Apr 12, 2015
    Epmtrucks, Apr 12, 2015
    #5
  8. Apr 12, 2015 #6
    beemergary

    beemergary Light Load Member

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    Apr 11, 2014
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    Only around 300 gals. run threw Cat filter. Was ok when left home . Needle turned into blurr after 40 mi. Gauge is newer than filter.
     
    beemergary, Apr 12, 2015
    beemergary, Apr 12, 2015
    #6
  9. Apr 13, 2015 #7
    Old Man

    Old Man Road Train Member

    4,597
    13,466
    Apr 3, 2009
    Oklahoma City, OK
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    Take the hose off the back of the gauge and put a pipe cleaner in the hose, worked for me.
     
    Old Man, Apr 13, 2015
    Old Man, Apr 13, 2015
    #7
  10. Apr 19, 2015 #8
    beemergary

    beemergary Light Load Member

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    Apr 11, 2014
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    Took Advise-gauge 90% better now. Yaa Woo
     
    beemergary, Apr 19, 2015
    beemergary, Apr 19, 2015
    #8
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