How does low pressure fuel pump work on sprinter?
How does low pressure fuel pump work on sprinter?
Make sure you have not damaged any O-ring seals on the click-on fuel unions and that are connected correctly. The Sprinter fired up on the second pull and ran wonderfully, I sat with my foot on the throttle, holding revs steady at about 3500rpm – at about 30 seconds into the test the revs dropped and the whole pulsing/revving cycle began again.
Can a dry pump be replaced on a sprinter?
The replacement pump can be fitted in an exact reversal of dismantling, along with the vacuum pump and finally the servo vacuum and turbo hoses. Since you have probably lost some fuel in the lines, possibly you have fitted a new dry-pump be prepared for a delayed start of the engine. Usually it fires immediately on turning the key then dies.
Why does my Mercedes Sprinter not go over 70 mph?
I had an interesting fault to deal with the other day on a 2004 (T1N) 313 LWB Mercedes Sprinter. The driver reported that the van would not go above 70mph and the ‘fuel filter clogged’ light was illuminating. Switching off and on the engine cured the fault, until trying to attain over 70mph where it would fail again.
What to do if you have a low pressure fuel pump?
Hopefully this section has given you an idea of things to check if you have a Mercedes CDI diesel engine with similar issues. Things to check in order are: Filter, fuel line connections/condition, blocked delivery pipe from tank, fuel pressure sensor and last – Low Pressure delivery pump!
Make sure you have not damaged any O-ring seals on the click-on fuel unions and that are connected correctly. The Sprinter fired up on the second pull and ran wonderfully, I sat with my foot on the throttle, holding revs steady at about 3500rpm – at about 30 seconds into the test the revs dropped and the whole pulsing/revving cycle began again.
The replacement pump can be fitted in an exact reversal of dismantling, along with the vacuum pump and finally the servo vacuum and turbo hoses. Since you have probably lost some fuel in the lines, possibly you have fitted a new dry-pump be prepared for a delayed start of the engine. Usually it fires immediately on turning the key then dies.
Where is the culpret on a Daimler sprinter?
If you have access to a DRB (Daimler scan tool) check fuel pressure. 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.
What kind of pressure crank does sprinter have?
This van is dead, makes no smoke or fumes when cranking. According to two scanners (SDS MB factory tool, and Snap on Solus) I have 5000PSI pressure cranking. 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.
How do you change a low pressure fuel pump?
To change the low pressure fuel delivery pump first remove the top turbo hose to gain unrestricted access to the area. Release and pull off the hard black vacuum pipe that serves the brake servo and tuck it out of the way. Now undo the two reverse torx head bolts that hold the vacuum pump to the cylinder head.
What to do when your fuel pump is not working?
Connect a fuel pressure gauge to the pump outlet, or tee a gauge into the fuel line at the carburetor. Crank the engine and note the pressure reading on the gauge. If there is no pressure, or if pressure is less than specifications, replace the pump. Most mechanical fuel pumps have a weep hole on the bottom side of the unit.
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.
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.
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.
How can you tell if your sprinter fuel filter is going out?
The only way that you are going to know that your Sprinter’s fuel filter may be going out is that it is no longer letting enough fuel through to keep the engine running under a heavy load, or at high-speed. Typically, if you are heading up a hill (or accelerating) the engine may start to feel like it is just running out of steam.
