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780 volvo fuel pump

Discussion in 'Volvo Forum' started by melinda824, Mar 11, 2014.

  1. Mar 11, 2014 #1
    melinda824

    melinda824 Bobtail Member

    16
    0
    Mar 11, 2014
    0
    Where is the fuel pump located at on a d12 engine. We have a fuel pressure fault coming up and considering trying to change it out our self. It is causing the truck to run like a car with bad spark plugs. ? Lol. When it acts up we can remove our air filter and after a few minutes it runs good with 6.5 to 7.0 mpg,with 20000 in the box, so we are confused . prior to this our mpg was like 5.5 with the same weight. Our engine brake isn't working and it don't have a lot of take off or pull-climbing power. This truck has all but but us under. Can't afford to buy another one, and hate to trade it in with 8 more payments to go.
     
    melinda824, Mar 11, 2014
    melinda824, Mar 11, 2014
    #1
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  3. Mar 11, 2014 #2
    melinda824

    melinda824 Bobtail Member

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    Mar 11, 2014
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    Found the schematics on volvo Web site
     
    melinda824, Mar 11, 2014
    melinda824, Mar 11, 2014
    #2
  4. Mar 12, 2014 #3
    waltherz

    waltherz Light Load Member

    133
    13
    Dec 12, 2012
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    Under steering wheel pump, has 3 bolts.
     
    waltherz, Mar 12, 2014
    waltherz, Mar 12, 2014
    #3
  5. Apr 22, 2014 #4
    big al 780

    big al 780 Bobtail Member

    21
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    May 5, 2012
    st louis mo
    0
    If runs like bad spark plug it may be injector cups getting air in fuel or sucking air from somewhere else
     
    big al 780, Apr 22, 2014
    big al 780, Apr 22, 2014
    #4
  7. Apr 22, 2014 #5
    Johny41

    Johny41 Road Train Member

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    Feb 10, 2011
    Ontario, Canada
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    ^yep, I replaced the cups 3 times; bad cups is causing hard starting when are leaking air the fuel drains back to the tank and need to pump it all the way back to injectors every time you start; i also used the manual pump sometimes ; costly job, over 2000$;
     
    Johny41, Apr 22, 2014
    Johny41, Apr 22, 2014
    #5
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