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Re: Merc 250 c class td air in fuel pipes when running...
Hi,good day,could be your hose have leak or clamp is not properly tight ,better to check first before sending your pump to calibration center,,or could be your filter,,ty
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coolant temp sensor, you have one for your gauge and another for your ecu, it adjusts air fuel ratio dependant on the outside temp as colder air is denser than warm.
This will almost certainly be the plastic fuel pipes connected to the fuel pump replace both of them this is a common fault the rubber o rings on the pipes harden and leak make sure you prime the diesel filter after replacing these pipes the engine can be difficult to start on this model once air is allowed in the system
I had the same problem with 1999 E300 TD 6-cylinder in-line engine.
The problem was the o-ring on the pre-filter. Make sure all o-rings are tight and try putting small amount of silicone grease when installing them.
One gallon of gas produces about 1 gallon of water vapor,its gotta go somewhere......thats why its best to run a car hot.have you seen a cars exhaust in winter,its steaming.......and the exhaust pipe is made of steel.....its cold..therefore CONDENSATION.
Hi
Ive gotthe same problem mine jas been in a supposed mb sepcialist harage new fuel pipes £200 then the pump overhauled £400 still the same they are now saying its the lift pump!!
Have you had any success
Bill
You may have to bleed the fuel system. There may be a very small air leak in the fuel supply line and after a long time idle, the fuel seeps bac into the tank, leaving an air lock in the pipe. When you go to start, this air makes its way into your injection pump & needs to be bled out before the engine will start. Begin from your fuel filter bleed valve, next the injection pump using the primer pump to transfer the fuel. Next loosen off the injector pipes and crank the engine over until fuel sprays form all the joints. Tighten injector pipes and start. It may run a bit rough for to begin with, but will soon even out. If it doesn't start, repeat bleeding of injectors.
hello,seems you have a loose clamp in fuel hose or your fuel hose have crack in area of clamp,also you can visual check fuel supply line,fuel filter up to primary pump,ty
have you had the transmission flushed? it seems to be caught in a limbo. where the calibration of the speedo and the transmission are not compatable. Now as wierd as that seems it happens usally like when going up a hill if you have a manual trans. and cruise locked in. it cant hold that speed and moves to a different speed if you dont down shift. Or perhaps your cruise control cable is slipping. is it vacume over mechanical? pop the hood and make sure all your hoses to cruise control are tight and no leaks.
Hi,
the only permanent solution to your problem is to replace ALL the O-rings on the injection pump fuel lines. Don't forget the one behind the fuel cut-off valve as well..
This is the only soltion that really worked for me.
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