How does the high pressure pump in a sprinter work?
How does the high pressure pump in a sprinter work?
The high pressure pump builds the high pressure and delivers it to the fuel rail manifold, which buffers out pressure fluctuations and distributes fuel to the individual injectors. The fuel quantity valve (fuel control actuator, M-Prop) in the high pressure pump controls pressure output from the pump.
Why are my cranks on my sprinter not working?
Checked clear lines and NO air bubbles or foam. Got van to start after several extended cranks but died as soon as accelerator peddle pressed. Van towed back to dealership and I asked what my feed pressure and rail pressure readings are and was informed they never tested or checked as the only code is no communication with MAF sensor.
What happens when you unplug fuel pressure sensor in sprinter?
If I unplug the fuel pressure sensor and crank for about 20-30 seconds I can get it to hit on what sounds like one cylinder and make a little bit of fumes. The actual pressure matches the desired after 10-15 seconds of cranking. The actual pressure gradually builds and when you quit cranking it gradually drops.
When to replace fuel pressure solenoid on sprinter?
If it is and there is leakage, replace the fuel pressure solenoid. The high pressure pump is driven by the camshaft, and requires no timing. Fuel that enters the high pressure pump is pressurized between 200-1600 bar (2,900 – 23,205 psi). The pressurized fuel is then supplied to the fuel rail.
Checked clear lines and NO air bubbles or foam. Got van to start after several extended cranks but died as soon as accelerator peddle pressed. Van towed back to dealership and I asked what my feed pressure and rail pressure readings are and was informed they never tested or checked as the only code is no communication with MAF sensor.
The high pressure pump builds the high pressure and delivers it to the fuel rail manifold, which buffers out pressure fluctuations and distributes fuel to the individual injectors. The fuel quantity valve (fuel control actuator, M-Prop) in the high pressure pump controls pressure output from the pump.
If I unplug the fuel pressure sensor and crank for about 20-30 seconds I can get it to hit on what sounds like one cylinder and make a little bit of fumes. The actual pressure matches the desired after 10-15 seconds of cranking. The actual pressure gradually builds and when you quit cranking it gradually drops.
If it is and there is leakage, replace the fuel pressure solenoid. The high pressure pump is driven by the camshaft, and requires no timing. Fuel that enters the high pressure pump is pressurized between 200-1600 bar (2,900 – 23,205 psi). The pressurized fuel is then supplied to the fuel rail.
What should the rail pressure be on a Sprinter diesel?
Check rail pressure when engine is off, it should be 0 PSI (+/- 500 PSI). Aerated or restricted fuel supply. Excessive idle time can cause white smoke when cold due to carbon build up on injector tips. More than 20% idle time is excessive. 2007-2009 model years use an electric supply pump in the tank to feed the CP pump at 59 +-2 PSI.
Is there a relative compression test for sprinter?
There is a relative compression test available using the wiTECH scan tool. Acceptable values between two cylinders must be equal to or less than 15 rpm. Restricted or aerated fuel supply to the high pressure pump. Actual versus desired too far apart, map the fuel pressure graph, if you have a fluctuation over 500 psi this may cause a surge.
Check rail pressure when engine is off, it should be 0 PSI (+/- 500 PSI). Aerated or restricted fuel supply. Excessive idle time can cause white smoke when cold due to carbon build up on injector tips. More than 20% idle time is excessive. 2007-2009 model years use an electric supply pump in the tank to feed the CP pump at 59 +-2 PSI.
There is a relative compression test available using the wiTECH scan tool. Acceptable values between two cylinders must be equal to or less than 15 rpm. Restricted or aerated fuel supply to the high pressure pump. Actual versus desired too far apart, map the fuel pressure graph, if you have a fluctuation over 500 psi this may cause a surge.
What should fuel pressure be on Sprinter diesel?
When checking the fuel pressure solenoid there should be no fuel coming out the return during cranking, and it should hold 870-1450 psi when unplugged during cranking. If it doesn’t, and the injectors are OK, then the fuel pressure solenoid is bad.
When checking the fuel pressure solenoid there should be no fuel coming out the return during cranking, and it should hold 870-1450 psi when unplugged during cranking. If it doesn’t, and the injectors are OK, then the fuel pressure solenoid is bad.
What is part number for sprinter fuel regulator?
Dont let your dealer try to sell you the whole regulator for $300 the o-ring only kit is part number is 05175439AA. 4. If this is not the problem you may have too much fuel bypassing inside worn injectors. You need to run a fuel quantity test.
What should fuel pressure be to start sprinter?
You must have at least 2500 PSI to start. 3. If no or low fuel pressure the nasty little culpret may be a 25 cent o-ring. The fuel pressure regulator is located at the rear of the fuel rail on 2002 to 2004 trucks. Its held in with two little torx head screws and can be a mother to get out. It’s not terrible you just have to work by feel mostly.
Where is the pressure regulator on a sprinter?
Pull out the fuel pressure regulator from the end of the fuel rail. Keeping the device clean, remove both the green O-ring and fibre backing ring from the tip of the regulator and replace with new components. Refit the regulator assembly to the rail.
You must have at least 2500 PSI to start. 3. If no or low fuel pressure the nasty little culpret may be a 25 cent o-ring. The fuel pressure regulator is located at the rear of the fuel rail on 2002 to 2004 trucks. Its held in with two little torx head screws and can be a mother to get out. It’s not terrible you just have to work by feel mostly.
Where is the fuel pressure regulator on a 2002 sprinter?
If no or low fuel pressure the nasty little culpret may be a 25 cent o-ring. The fuel pressure regulator is located at the rear of the fuel rail on 2002 to 2004 trucks. Its held in with two little torx head screws and can be a mother to get out. It’s not terrible you just have to work by feel mostly.
If no or low fuel pressure the nasty little culpret may be a 25 cent o-ring. The fuel pressure regulator is located at the rear of the fuel rail on 2002 to 2004 trucks. Its held in with two little torx head screws and can be a mother to get out. It’s not terrible you just have to work by feel mostly.
What does net positive suction head ( NPSHr ) mean?
NPSHR or Net Positive Suction Head Required is the technical term used to determine what pressure energy (in psia or feet of head) is needed to fill the pump inlet and not have the pump cavitate. NPSHR is based on pump design. It is a characteristic which varies primarily with pump speed and the viscosity of the fluid.
What causes a centrifugal pump to be too high?
Suction lift too high (Lower suction lift, install foot valve and prime) Insufficient inlet pressure or suction head (Increase inlet pressure by adding more water to tank or increasing back pressure)
Why does my self priming pump have high points?
The suction pipe should rise continuously to the pump and not higher. In the field, I frequently see suction pipes with high points before the pump suction usually due to obstructions. These high points become a place for the air and other non-condensable gases to collect and will bind the pump suction line.
