i'm stumped! my converted a-cert has low fuel pressure 70 to 80 lbs at idle and at high idle. changed trans pump and check valve and new suction lines from tanks. what am i'm missing. also shimed pump with no change.
low fuel pressure
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Superhauler, Sep 1, 2012.
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What is it supposed to have?
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Superhauler I have wondered that myself. I can't seem to make it the pressure change on my MRX pump.
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MRS pump. Seems like my guy at the Cat House told me about a check valve recently that will hold to 105.Going to check with him this week.
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Still trying to say mxs But this phone will not let it happen
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did you change the pressure regulator in secondary fuel filter housing.try pressure reg out of sdp serial engine they have a little higher fuel pressure. The fuel pressure is supposed to be 100 at 1400 rpm.
Last edited: Sep 2, 2012
EverLuc Thanks this. -
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How does it run is it posible that one of the poppet valves in one the inj. Are weak.
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The problem isn't an injector even if cylinder pressures entered the tip of the injector, the injection pressures would eventually rise above this and force the fuel out the tip. You have something obstructing fuel flow somewhere or a bad pump
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What about pick up tube opstruction.
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