Not mine. But I've seen several doing it and assumed there was something wrong. The other day I've parked next to what looked like a new Freightliner and it was doing same thing. I think it had AC on. Is it normal.
DD looping at idle
Discussion in 'Trucks [ Eighteen Wheelers ]' started by me myself and I, Nov 21, 2016.
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Certain rpms sometimes induce a lope, usually give it a tap up and it quits the surge, it's right around 900 rpm on the one I drive.
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It's s fuel pressure regulator on drivers side behind all the fuel lines by filter .. I can't remember the cost to change it but I know it was more if it had a certain bracket in front of it .. truck had way more power and went up 3/4 mpg so it paid itself off quickly 2009 530 hp dd15 didn't have the bracket
Socal Xpress Thanks this. -
Quantity control valve on the back of the high pressure fuel pump causes surging at idle. You can watch its current in diagnostic link and see it spiking, at idle it should be fairly consistent.
P/N A0000900069
They are terrible on 113 BBC cascadia and DD13s. Other than that fairly easy. I've never seen a pump installed without the bracket. And to remove the bracket you need to remove the air compressor coolant line and that bracket. Sometimes the inner fender, high pressure fuel lines and flange.pauliuks99, QUALITYTRUCK, magoo68 and 2 others Thank this. -
I think fuel filter housing must be removed to reach the third bolt on dd15. Which value do you monitor in DiagnosticLink for this particular issue?
Also that valve cost $800 when the entire reliabilt pump costs $1100. if its time to change it replace the whole pump.Last edited: Nov 22, 2016
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mhyn Thanks this.
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I replaced fuel quantity valve and it helped but still has a surging idle especially at startup. Seems to smooth out after running a bit but is not right?? Any suggestions
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