Ml270cdi air in fuel pipe

[dav65uk]

Just recently my Ml270 has been hard to start in morning after it’s sat overnight, once it fires up it’s fine during day
Any ideas how or where to look I’m guessing air is getting into system when it sits for a while

cheers in advance

 

[mersum1es]

Low pressure fuel line o-rings, brittled low pressure lines. Also too heavy injector tank leak cause starting problems, easy to DIY measure.

 

[Taffy7hfa]

Check for bubbles in the plastic fuel lines coming from the tank, it's usually the low pressure lines that connect to the high pressure pump that cause problems. As above try replacing the little green O rings first.

 

[Mark A]

Also worth checking the fuel lines that run along passenger side of the car to see if any heavy corrosion. Had a leak there on our old 02 ml270.

 

[Steve069]

I have the seame problem with mine how many and where are the o rings to replace. Tia