+- Rawze.com: Rawze's ISX Technical Discussion and more (http://rawze.com/forums)
+-- Forum: Big Truck Technical Discussion... (/forumdisplay.php?fid=1)
+--- Forum: Ask Your question... (/forumdisplay.php?fid=45)
+--- Thread: ISX15 cm2350 Gear(Lift) fuel pump (/showthread.php?tid=1343)
ISX15 cm2350 Gear(Lift) fuel pump - mmssvv - 01-11-2017
Hi everyone.Is there any check valve or pressure regulator on this pump to be checked?
When measuring gear fuel pump pressure I see fluctuation.This fluctuation is worse under driving condition and hi rpm 1400-1600.Engine run rough and no power.What can cause this?Fuel system primed,no air in return line and no inlet restriction.No fault codes.
Thanks in advance.
RE: ISX15 cm2350 Gear(Lift) fuel pump - Rawze - 01-11-2017
As far as the main fuel rail pressure is concerned...
How much it is allowed to fluctuate,.. I do not know, but I do know it is normal to go up and down by quite a little bit.
It is normal for the pressure to fluctuate. It is a bypass/charging circuit system with an accumulator, meaning it will charge to a certain pressure,.. bleed off as the fuel is used,.. and re-charge when if reaches a minimum pressure that makes the pump kick back in and top it off again.
RE: ISX15 cm2350 Gear(Lift) fuel pump - mmssvv - 01-11-2017
(01-11-2017 )Rawze Wrote: How much it is allowed to fluctuate,.. I do not know, but I do know it is normal to go up and down by quite a little bit.
It is normal for the pressure to fluctuate. It is a bypass/charging circuit system with an accumulator, meaning it will charge to a certain pressure,.. bleed off as the fuel is used,.. and re-charge when if reaches a minimum pressure that makes the pump kick back in and top it off again.
Thanks for the replay.I am concerned about this fluctuation because,when I bought the gauge a year ago and try it for first time I remember the arrow on the gauge was steady,no any move 160 psi at idle.Now is shaking +/-50 at idle and up to 150/200 at hi rpm.Do not looks normal for me.