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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.
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.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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that fuse powers pcm fuel heater and some other things. when the fuse blows the pcm shuts down. causing it to not run. usually its the heater that is bad. it is located at the back driver side by the fuel pump. you can unplug it and see if it starts. if so you will need to replace the heater
only 2 things can maake a diesel run rough at start up ,,1--- air in the system 2----- 1 or more of the glow plugs not working. this sounds like the latter ,if you have a couple of glow plugs not working ,it will miss on those cylinders until it warms up ,and the smoke is mostll exesive fuel when it does fire . recommend you check the glow plugs
you test the resistance of each glow plug, they should all be about the same resistance, if u find any that are way off from the others then chances are they are defective. Have u considered going to constant duty glow plugs? they last far longer and are cheaper in the end.
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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