Question about 1999 Ford F350 Regular Cab

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Fuel system problem

My 7.3 powerstroke 1999 f350 is hard to start, once started it MUST be warmed up to operate at all,and it runs out of power just over 2000 rpm.i figure it is a fuel delivery problem, but it has 2 fuel pumps, a regulator, filter...how do i figure out where the problem is? oh, if you warm it up and drive conservativly it seems fine.any answers?165000 miles on it.

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  • patmandu May 26, 2009

    I have a 99 F-250 superduty with the 7.3 and also have the same symptoms. Even after changing the fuel filter the sluggishness and lack of low end power still exists.Once the turbo kicks in it takes off like a rocket. I first checked all the air induction conections to and from the turbo and found some to be loose.Checked vacuum control for wastegate and turbo for excessive play but found nothing abnormal. Noticed slight power increase after tightening hose clamps at aftercooler but still lacks low end power. Next step is to check fuel pressure at the fuel rail...should be 45-65 PSI running.The truck just seems like it's starving for fuel....just like it's got a clogged fuel filter. I'm wonde

    ring if maybe I have a clogged inlet line at the primary lift pump. I can't locate it but my service manual says it's located at the left side frame rail. I think it may actually be located in the tank.The fuel pressure check should reveal if the electric fuel pump is operating correctly.

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  • Master
  • 634 Answers

Try running a fuel sludge cleaner through system

Posted on Jul 06, 2009

  • nathan Jul 06, 2009

    you may have some sludge build up slowing fuel flow

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