C250 Starting problem help needed

[pikey2009]

Can anybody help ? I have a C250 td and have trouble starting it . Dosn`t matter if it it is cold or hot , it`s a pig to start,
I did try facing it down hill to see if that made a difference but no joy there .

Have spent over £1000 tryin to sort it out but still the same , don`t know what else i can do ,apart from sell it and let someone sort it it out

It`s had new merc glow plugs, non return valves put in, new fuel filters and still the same , some days it start and more than ever now won`t start at all

HELP NEEDED :idea:

 

[television]

Hello and welcome, can you see any air bubbles in the plastic fuel line pipes.

If air is getting in, even in the fuel to tank lines then it will be hard to start

http://www.detali.ru/cat/oem_mb2.as...GM=717.417&CT=F&cat=44V&SID=47&SGR=045&SGN=03

http://www.detali.ru/cat/oem_mb2.as...GM=717.417&CT=F&cat=44V&SID=47&SGR=060&SGN=04

http://www.detali.ru/cat/oem_mb2.as...GM=717.417&CT=F&cat=44V&SID=47&SGR=030&SGN=02

http://www.detali.ru/cat/oem_mb2.as...GM=717.417&CT=F&cat=44V&SID=47&SGR=015&SGN=01

 

[pikey2009]

Yes can see air bubbles in the fueline not to the filter , but how do i stop them getting in there?

 

[Nick1964]

Looks like it's sucking air. This can take some finding as iften the joints or perforations are sufficient to suck air under vacuum but insufficient to leak a viscous fluid like cold diesel. It's worth checking for any chafing where pipes run close to other components or bodywork and pipe joints. I've had this several times before on diesel cars that often vibrate a fair bit which can end up chafing insecure pipes. If you have access to compressed air it's worth disconnecting both extreme ends of your fuel line, block one end off and pressurise it with air regulated to about 20 PSI while looking and listening signs of air escaping; this is much easier with someone to help you.

Hope you find this useful.

Regards,

Nick

 

[television]

Nicks post gives you some checks,,if the pipes are OK then the O rings where the pipes connect are leaking, they cost 40p each from MB.

What happens is that you can compress air, but not fuel, so when you try and start, the high pressure pump is only compressing the air, and cannot get the fuel through. the pipe with the air bubbles should be the one that is leaking