Diesel starved w202 250 diesel

[Gerhard Engelbrecht]

Good afternoon. I recently bought a 1997 w202 250 diesel. The owner say it was diesel starved and they couldnt get it running again. It is a automatic. Any advice on how to bleed the system please.

 

[onefortheroad]

Try cycling the ign a few times , waiting 20 seconds between each cycle, then try starting it.

 

[Blobcat]

Wonder if the previous owner has been running it on veg oil?

The 250 isn’t “cdi” but the pumps can still suffer - I’d get the fuel filter, pump and injectors checked

 

[mioba]

hmmmm seems a bit of a red herring to me. I have never bled a merc thats had air in the fuel system. Ignition on to pos 2 (dont start), then off, then repeat (to purge air). Then a start.

Mercs dont like poor diesel filters. Check, replace with genuine.
Seems the fuel pump may have ran dry and thats what the PO is alluding too - possible?


they need fuel and compression. you need to dig deeper and determine why no fuel is getting to the injectors. fuel filter,lines, leaks, pump etc

 

[Doug1234]

Saddle tanks / bet the tanks less than half full .. fill it up and don’t let it go below half a tank full and you will not have a problem.
Do a search on this forum for w202 saddle tank.

 

[LostKiwi]

The way I've always bled mechanical diesel injection systems is to 'crack' the fuel union nut on top of the injector and crank till diesel flows from it then re-tighten.

 

[ajlsl600]

hmmmm seems a bit of a red herring to me. I have never bled a merc thats had air in the fuel system. Ignition on to pos 2 (dont start), then off, then repeat (to purge air). Then a start.

Mercs dont like poor diesel filters. Check, replace with genuine.
Seems the fuel pump may have ran dry and thats what the PO is alluding too - possible?


they need fuel and compression. you need to dig deeper and determine why no fuel is getting to the injectors. fuel filter,lines, leaks, pump etc

I put airline in tank at times low press to help get diesel thru