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volvo fuel problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by hard times, Jul 30, 2011.

Page 1 of 2
  1. Jul 30, 2011 #1
    hard times

    hard times Bobtail Member

    49
    2
    Feb 13, 2011
    lafayette la.
    0
    My 99 d12 seems to run out of fuel or lose it's prime, mostly when shifting gears when the RPMs go up and down. Does a 99 volvo have a lift pump or where should I start looking, where is the main pump on this engine?
     
    hard times, Jul 30, 2011
    hard times, Jul 30, 2011
    #1
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  3. Jul 30, 2011 #2
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,779
    1,725
    Jun 14, 2009
    romulus,mi
    0
    common problem with volvo's of that model year is cracked pick up tube in fuel tank (usually passenger side)
     
    QUALITYTRUCK, Jul 30, 2011
    QUALITYTRUCK, Jul 30, 2011
    #2
  4. Jul 30, 2011 #3
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    what is the fuel pressure? you can check it with VCADs software ore with gauge. It is normal over 1.8 BAR at idle.

    if lower - change fuel delivering pump
     
    Pablo-UA, Jul 30, 2011
    Pablo-UA, Jul 30, 2011
    #3
  5. Jul 30, 2011 #4
    poniikyanion

    poniikyanion Light Load Member

    69
    14
    Nov 23, 2009
    Newark, NJ
    0
    May I suggest it is a loose ECM power wire(s) to the battery posts? The sympton is just like what you describe. Check the two separated tiny wires that connect to the battery posts. When it started to come loose your engine will start to miss wheneve you hit a bump on the road. It happened to both of my 98 and 05.
     
    poniikyanion, Jul 30, 2011
    poniikyanion, Jul 30, 2011
    #4
  7. Jul 30, 2011 #5
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    All volvo ECMs are not power supplied from battery box!

    D12C control unit is supplied with ign. power (to supply processor board) and there is power relay in fuse box controlled with ECM (+12V to voltage converter and power MOSFETs). If voltage is lower 10.5V ECM stores fault codes.

    So.... IMO, there is fuel delivery issue!
     
    Pablo-UA, Jul 30, 2011
    Pablo-UA, Jul 30, 2011
    #5
  8. Jul 30, 2011 #6
    hard times

    hard times Bobtail Member

    49
    2
    Feb 13, 2011
    lafayette la.
    0
    My fuel feeds from the bottom of both tanks, all batt. connections are good, where is the delevering pump located? And would the pump come and go or is it gear driven? The truck idles good and if it sets 24 hours some time it will start and sometime has to be primed. tanks are full and no visable leaks, it's driving me nuts!
     
    hard times, Jul 30, 2011
    hard times, Jul 30, 2011
    #6
  9. Jul 30, 2011 #7
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    what about check valve and pressure limiting valve?
     
    Pablo-UA, Jul 30, 2011
    Pablo-UA, Jul 30, 2011
    #7
  10. Jul 30, 2011 #8
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    [​IMG]
     
    Pablo-UA, Jul 30, 2011
    Pablo-UA, Jul 30, 2011
    #8
    The Challenger Thanks this.
  11. Jul 30, 2011 #9
    hard times

    hard times Bobtail Member

    49
    2
    Feb 13, 2011
    lafayette la.
    0
    Thanks Pablo I will check it out, is there anyway to test it?
     
    hard times, Jul 30, 2011
    hard times, Jul 30, 2011
    #9
  12. Jul 30, 2011 #10
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,640
    Oct 11, 2010
    Borispol, Ukraine
    0
    look for bleeding port on head, it is used for fuel pressure testing too.

    Hard start may be related with check valves, but '99 is an old engine and seems to me pump is bad.

    On picture the typical system is shown, filter configuration may differ. Electric priming pump is option and may be it is not installed on your engine, like water in fuel separator and electrically heating lines and filter.

    Anyway all check valves shown are used.
     
    Pablo-UA, Jul 30, 2011
    Pablo-UA, Jul 30, 2011
    #10
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