308 CDI 2.2 won't start - hot or cold

[gagarin]

Hi all!
my Sprinter CDI 308 2.2 was running fine until one day I simply turn the key off. When tried to start it again just 10 seconds after this it couldn't start. I crank it til the battery went flat but no luck. After this someone gave me the idea of spaying some easy start into the air pipe and...miracle - it started straight away. I drove back home with no problems but as soon as I turned the key off and tried to start it, it would get going without easystart. I borrowed a carsoft interface to check the ECU and found out that there ware 5 errors stored on it. I erased them and tried to start it but the problem remained. Then a changed the fuel filter together with the water sensor (the one that goes underneath the filter), stack the pipe which feeds the filter in a bottle full of fuel (just in case there something wrong along the system from the tank to the filter) but the problem was still there. Then removed the plastic cover to expose the common rai, undid the pipe which feeds it, cranked the engine and found out that the pipe is bleeding. After that I undid each one of the 4 pipes feeding the injectors but found out that there is fuel there as well. The engine still sounds great but won't start without easystart. No errors are stored on the ECU neither. Have anyone had similar problem and do you guys have any suggestions of what could have caused it?

[adamuk]

The hot film mass air flow meter could be at fault?? It's the thing you are squirting easy start into.

[zx9]

My bet would be the o rings in the pressure regulator at the end of the high pressure fuel rail. On starter motor the high pressure pump can not build up enough pressure/ volume to overcome that lossed through leaking o rings. With the engine running on easy start the pump turns over fast enoung to pressurise the fuel rail and injectors.

Regards

ZX9

[gagarin]

Originally Posted by zx9

My bet would be the o rings in the pressure regulator at the end of the high pressure fuel rail. On starter motor the high pressure pump can not build up enough pressure/ volume to overcome that lossed through leaking o rings. With the engine running on easy start the pump turns over fast enoung to pressurise the fuel rail and injectors.

Regards

ZX9

Your bet wins m8 We got it changed tonight and started straight away. Now I have to call mercedes garage to cancel my apointment. Thanks!!!Nice one...

[Benz the best]

Mate you have to test your injectors with a special tool, injector are returning too much fuel and they are not holding pressure to able the vehicle to start

[ktbstudio]

Originally Posted by zx9

My bet would be the o rings in the pressure regulator at the end of the high pressure fuel rail. On starter motor the high pressure pump can not build up enough pressure/ volume to overcome that lossed through leaking o rings. With the engine running on easy start the pump turns over fast enoung to pressurise the fuel rail and injectors.

Regards

ZX9

Hello

I had the same problem with a 211 2.2 cdi sprinter, but i don't found the pressure regulator. Sorry, can you send a photo, where i found the fuel regulator?

Thanks.

[ktbstudio]

I have found the regulator, and i changed the 2 o rigns. I remounted the regulator, for the first time, the engine starts normaly, then at the 2, and 3th start starts after a lot of crank, and at the 4th time, don't starts.
Probably the pressure regulator is failed?

I mounted a pipe to the end of the regulator, where is the 2 o rings, but the regulator don't keeps the pressure. After 10 seconds the vacum pressure is 0.