2004 volvo d12 Loss of power loss of boost difficult starting

Discussion in 'Volvo Forum' started by Frustrated21, Dec 6, 2022.

  1. Frustrated21

    Frustrated21 Bobtail Member

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    Aug 4, 2021
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    2004 volvo d12…while driving had loss of power and boost and running very rough and then would regain power and boost for a bit and then loos power and boost…truck idles all night with no problem…feels like no fuel getting to we’re it needs to go and will stall when stopped and then very difficult to get going again…changed fuel filters…checked all fuel lines and have fuel additives in fuel for cold weather…checked battery connections…no codes thrown…no blue smoke…help!!!! What am I missing??
     
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  3. skallagrime

    skallagrime Road Train Member

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    Indiana
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    You checked fuel lines, how? Could be collapsing from inside, or connection admitting air only under high load/leaks air in when off, this is not going to be easy to see visually.

    Cam position sensor wire frayed and shorting out is possible too
     
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  4. Siinman

    Siinman Road Train Member

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    Any bubbles in your fuel tank?
     
  5. ‘Olhand

    ‘Olhand Cantankerous Crusty

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    Sounds like fuel filter(s)
     
  6. skallagrime

    skallagrime Road Train Member

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    He did say hed already checked and changed those
     
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  7. Frustrated21

    Frustrated21 Bobtail Member

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    Aug 4, 2021
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    Got the old girl running…3 bad o-rings on fuel lines…so far so good…see what happens when we get down the road and put it under load …thank you to baldy’s service in fox creek for all the help
     
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  8. Tha General

    Tha General Bobtail Member

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    Dec 14, 2022
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    I’m having an issue with my 04Volvo D12. Last week, it cranked up great with no issues. Ran for fifteen to twenty minutes. Then shut off. Had to spray starter fluid, in order for it to catch and crank. Ran well for the remainder of the week. Came home for the weekend. Same thing this Monday. Cranked and ran for te to fifteen minutes. And shut off. Haven’t been able to get it cranked. Changed fuel/water separator filter. Changed ball valve. About to change regular fuel filter. And I have an electric primer pump. That works m unbeknownst on how it works. Any assistance please.
     
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