1994 250 diesel

[jasmurray]

has any one had problems starting I have found that I now have to keep my tank at least half full and avoid leaving my car parked facing up on a gradient.
Help please!

 

[Bolide]

Leaky diesel

This is pretty common. Air leaks into the diesel system and the resulting airlock makes the car a pig to start

I normally replace the O rings on all the clear plastic fuel pipes round the filter & injection pump and this seems to cure it. You can get them from the dealership for about £1 each. There are two sizes

The O rings tend to flatten with age and they start leaking when they're disturbed. It normally happens after changing the fuel filter


Nick Froome
www.w124.co.uk

 

[jak]

does not the O ring come with the filter??

 

[Bolide]

O ring

An O ring does, yes. I'm talking about the O rings on the rest of the pipework

I assume you have a multivalve engine if it's a 94 car. The multivalve engine (606) has a bunch of plastic pipes from the filter housing to the injector pump


Nick Froome
www.w124.co.uk

 

[jasmurray]

1994 C class 250 diesel

Thanks for your reply its a c250 does your advice remain the same?

 

[Bolide]

C250

Thanks for your reply its a c250 does your advice remain the same?

I believe so, yes

Not an expert on the C Class but AFAIK the engine / box setups were pretty much identical across ranges apart from the W124 diesels having no turbo

You'll soon see when you look at the diesel filter & pre-filter hosuing. If there's an explosion of white or transparent plastic pipework behind it then there's the likely culprit


Nick Froome
www.w124.co.uk