W203 Wont start after changing thermostat

Ajkingy89

New Member
Joined
Mar 7, 2018
Messages
3
Reaction score
0
Your Mercedes
C220d W203 2001
Hi all,

1st time using this thanks for advice in advance.
My 2001 c220d was taking ages to heat up the cabin so got my local garage to install a thermostat. Now the ****** thing wont start.
If you spray a bit on easy start in it it will fire and run no probs but leave it for a while and it wont start again any idea’s
 

Uncle Benz

Senior Member
Joined
Mar 31, 2006
Messages
3,287
Reaction score
1,847
Age
50
Location
West Sussex
Your Mercedes
Mainly Mercedes
Sounds to me like they have disturbed a fuel line O ring. You need to move the pipes a bit to change the thermostat. Probably pushed a hard old O ring over the edge
 

star

Forum Supporter
Authorised Forum Supporter
Joined
Oct 6, 2004
Messages
5,735
Reaction score
1,186
Location
Reading
Your Mercedes
Smart + others :)
They have either cracked or disturbed one of the fuel pipes, which if the seals have hardened will be letting in air.
 
OP
A

Ajkingy89

New Member
Joined
Mar 7, 2018
Messages
3
Reaction score
0
Your Mercedes
C220d W203 2001
  • Thread Starter
  • Thread starter
  • #4
I did read somewere about the o rings but when i told the garage they were scratching thier heads as to what and were they where ? Can you piont me in the right direction many thanks
 

Steve@Avantgarde

Forum Supporter
Authorised Forum Supporter
Joined
Dec 8, 2009
Messages
7,021
Reaction score
1,295
Location
Bristol/Somerset
Website
www.avantgarde-automotive.co.uk
Your Mercedes
C220CDI AMG Line Premium, SLR McLaren Roadster, SL55 & C32AMG
TO change the thermostat you will need to remove the low pressure plastic fuel pipes that go from the low pressure to the high pressure pump. These have o rings on them. If they become damaged then it won't be air tight, meaning diesel will run back to the tank. The other common thing is the a T pipe that always goes brittle and can crack at the junction of the pipe allowing the same thing to happen.
 
OP
A

Ajkingy89

New Member
Joined
Mar 7, 2018
Messages
3
Reaction score
0
Your Mercedes
C220d W203 2001
  • Thread Starter
  • Thread starter
  • #6
Thanks Guys
 

mercedes13156

Senior Member
Joined
Dec 27, 2005
Messages
1,267
Reaction score
210
Location
West Lothian
Your Mercedes
CLK 200 Cabrio and a Ford Kuga
You can easily recover the pipe connectors and replace the fuel pipes with black nitrile pipes and screwdown pipe clips. I did that twice in successive C Classes with complete success. The total cost was about £8.00 for each car. The T junction to the black thingy can be eliminated as it has no particular function. Mercedes told me it was a test point which they almost never use. I never missed it.
 


A truly one stop site for Mercedes owners. Very experienced – friendly – down to earth – cost effective repairs offering either genuine or same quality parts so that you do not compromise your Mercedes heritage or reliability. Tel: 01406 422457fleetroadgarage.co.uk
Top Bottom