2007 Sprinter 312 2.2 CDI Not Starting: Fuel Pump, High Pressure Pump, Rail Valve, & E8 P1955 Error

Question

Hello, I have a problem with the 2007 CDI 2.2 sprinter, after returning from the route after switching off, it does not start even from the start. The fuel pump from the tank feeds the high pressure pump and this, unfortunately, no longer passes to the rail. I replaced the high pressure pump...

Anonymous · Accepted Answer

Why such a major renovation without knowing, is it really a high pressure pump (pwc) with a control valve? If after replacing it the engine still does not want to start, what is the second time to do the same, since logic shows that it is not her fault? Was the fuel transition from the tank to the pwc checked in the first step? Is sometimes the low pressure circuit not pestilential ? Whether fuel filter is it clean and unobstructed? Is the fuel fed by electric pump under pressure at least 2 bar ? Are there metal filings at the bottom of the fuel filter can? (Photo below). If you observe small metal chips as in the picture above, it means that you are refueling for dry fuel, which may have contributed to the immobilization of the injectors, and, what's worse, could have caused the valve to explode. Is the fuel pressure on the rail (reservoir) rising within 1-2 sec to the value 150-200 bar? If the pressure does not have such a value read on tank pressure sensor , the computer refuses to ignite due to insufficient pressure on the injectors. Are all injectors switched on electrically? If at least one of them has, for example, a broken electrical cable, then the computer may simply refuse fuel injection due to the lack of power supply to the injectors. These are the basic steps that should be taken when the engine does not start. We do not begin to disassemble the most durable and expensive engine component once again, while having hard evidence that it was unnecessarily moved ... If you do not know what to do, read other topics, they may lead to the defect Kitten KotBury2

Jackall · Accepted Answer

Injections will not get power if the conditions are not met. As there is no fuel pressure, too low RPM etc.

leonov · Answer

A colleague was looking for in the forum? link

Mehus-M · Answer

Yes, I searched and none of the topics gives the answer to the problem I described. However, the error you indicated in the links does not mean that you can not start the engine even from the proverbial cake because the glow plug driver does not affect the control of valves on the CR bus ... The problem is in controlling the valves that does not feed fuel to the bus. and the burned glow plug is already replaced and that didn't help either.

Anonymous · Answer

What is the condition of the battery? If the voltage dropped to 9 V, it is not surprising that the engine does not want to start. Measure the no-load voltage with the meter (disconnect the clamps). Must be in the range 13.5-14.1 V . Kitten KotBury2

Jackall · Answer

I guess you're doing it, buddy, if the battery is 12.7V, it's good. The voltages you have provided are for a working engine rather.
On the cake must walk, if you do not want something with a timing, exhaust, or fire extinguishing flap closed.

Mehus-M · Answer

Aku is good, it is always fully charged for each firing attempt. We checked the control voltage on the valve on the high pressure pump on another sprinter and it is the same as in my case. The worst thing is that with each attempt the injection will run dry and eventually the trail will hit ...

damdam · Answer

probably the HP pump axis is spinning.

Mehus-M · Answer

The HP pump was also bought and replaced. Today I will take it out again and give it to check on the instrument.

Mehus-M · Answer

After checking on the instrument it turned out that both the old and "new" used ones were broken, they did not give pressure. The purchase of a brand new pump helped.
Sprinter fires so the topic can now be closed.
Thanks to all who helped

2007 Sprinter 312 2.2 CDI Not Starting: Fuel Pump, High Pressure Pump, Rail Valve, & E8 P1955 Error

How can I diagnose and fix a 2007 Sprinter 2.2 CDI that cranks but will not start even though the tank pump feeds the high-pressure pump, no fuel reaches the rail, and fault E8 P1955 is stored?

No rail pressure despite pump and valve replacement

No rail pressure despite pump and valve replacement

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Valve control fails to feed fuel to common rail

Valve control fails to feed fuel to common rail

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Battery and pump valve voltages match; inspect timing and flaps

Battery and pump valve voltages match; inspect timing and flaps

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ACME Damian Michalski

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