E300td won't start

[R Phillips]

Ok I've had problems with a fuel leak and fuel draining back to the tank.
I've replaced both fuel filters and the plastic clip in pipes, I have primed the large filter but not the small one, but the car won't start.
I am putting it down to fuel not getting through, should I be doing more in the way of priming the system?

Is there a diagram of the fuel system, I've seen parts list but not a plan of what all the pipes are doing?
It's a 1999 300TD est (W210?)

 

[grober]

there's this manual Mercedes-Benz E-class Models, Diesel and Turbodiesel E200D, E220D, E250D, E250 TD, E290 TD, E300D, E300 TD Series 210, 1995 to 2000 with Injection Pump Pocket Mechanic: Peter Russek: Amazon.co.uk: Books

or this one

Mercedes-Benz E-Class Diesel Workshop Manual: Powered by 4, 5 and 6 Cyl. CDI Engines W210 Series 1999-2006: Owners Edition: Amazon.co.uk: Books


don't know which engine you have??

 

[R Phillips]

Thanks, would have liked to get it going today.

 

[Number_Cruncher]

On the lower of the two diagrams on this page;

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Fuel from the tank is fed via a flexible pipe to the fuel heater, part number 155.

Having passed through the fuel heater, the fuel is filtered in the pre-filter going into the pre-filter in pipe 32, and leaving via pipe 56 to the electrical shut-off valve.

From the lower edge of the shut off valve, fuel leaves via pipe 74 to the inlet of the fuel lift pump. Until this stage, the fuel has been at or about atmospheric pressure.

Fuel under pressure leaves the lift pump via pipe 83, and goes to the secondary filter. After being filtered, fuel leaves the secondary filter via pipe 95 and goes to the shut-off valve. From here, when the valve is open, it flows into the injector pump gallery.

Return fuel leaves the injector pump gallery via the banjo union fitting 125. Within this fitting is a ball and spring relief valve which controls the pressure of the fuel between the output of the lift pump and itself. After the relief valve, the fuel pressure again is about atmospheric.

The fuel return flow from the injector pump goes to a four way fitting on the fuel filter body. In the secondary fuel filter, for the purposes of automatic bleeding, there is a restricted leak path between the filtered fuel and the return - this fuel (and perhaps air) leaves the fuel filter via the O ring sealed port of the four way fitting. The small pipe 146 is the leak off fuel returning from the injectors, and the last of the four ports on the fitting connects to the flexible pipe which returns fuel to the tank.

Take a few minutes, and make absolutely sure your pipe routing matches the one printed on the parts list. The pipes DO reach far enough to be corrected wrongly.

There is a hidden O ring behind the shut-off valve which can also leak.

It's possible that the electrical connection to the shut-off valve was disturbed while the new pipes were being fitted.

 

[Benzowner]

If the fuel is just draining back to the tank, it will start but you will need a first class battery. Turn the key and keep it turned, don't release it, a small bit of throttle and it will eventually start. Basically you will be trying to start with un-preheated diesel as you will be pumping straight from the tank. I had need to do this twice when I had the E300

 

[R Phillips]

Thanks for the above it did help and I got it running, but it now looks like the leek is from the rear of the "electrical shut-off valve" So i still can't use it.
Anything I need to know if I try change change this myself?

 

[Number_Cruncher]

>>Anything I need to know if I try change change this myself?

Nothing really - just be very careful with the bolts in the soft alloy of the injector pump when building it back up - make sure the threads are properly started before using anything beyond finger tightness, and there's no need to put them in too tight and risk stripping the thread.

 

[Ali E300TD]

O rings for all the diesel hoses around the IP and the filter?


Does 210 OM606 have two fuel filters?? How come?? one is very prominent in the engine bay.. wheres the other one?

 

[Number_Cruncher]

If you follow the link in my post above, you'll find part number 26, the so-called pre-filter. When you buy a new pre-filter from MB, they don't give you a new O ring, so, it's best to ask for one while you're there.

There is also one of the fuel line O rings in the top of the pre-filter itself. Lots of scope for leaks!

 

[Ali E300TD]

Thanks man!

Cant this be washed and put back?

Its just a gauze.... I have seen this but never knew MB classifies this as a filter

 

[Number_Cruncher]

If it were an expensive part, it might be worth considering.

They're about £2.50, so, really not worth doing anything with but fitting a new one.

 

[nala]

E300 TD wont start after leaving it for a while

Seems this a common fault. Its in the Merc manual. Its the fuel draining from the pump, there could be a few reasons ,mainly to do with fuel pipes around the injection pump ,the fuel pump , the fuel filter,and the fuel shut off valve attached to the fuel injrctot pump . The seals on the pipes are all "O" rings and the main one that gave me a problem was the feed into the injector pump . In the W124 manual it shows the injector pump and on the E300 the fuel shut off valve feeds the injector pump thro the same hole and the seal is an "O" ring . The pipes and transparent plastic pushed onto the connectors and the W/Shop manual suggests they can also leak if they let air in then the fuel goes back to the tank .Hope this helps AC

 

[colywoble]

whilst on the subject....

Hi Guys,

Can someone please help?
I am going to replace the glow plugs on my '98 E300t but I would also like to replace the fuel pipe seals while i'm there...does anyone (i'm sure i've seen it somewhere on here) have a kit or the size and quantity of seals required so I can pre order them (not from Merc).
Any help is much appriciated......

 

[BlackC55]

Get them from merc. They are not expensive. I would replace the pipes not just the seals as they become brittle when old.

 

[colywoble]

Thanks, I appriciate your comments but the pipes are in good condition and I can get the seals for free, just need to know the sizes and quantity........

 

[Number_Cruncher]

When I first bought my E300D, I did the same as you. I found the size of the O rings, and bought some in, and replaced them.

Now, 2 1/2 years down the line, I have good O rings but nasty brittle pipes - and it's a manifold off job to do a proper job of replacing them.

I wish I had just bought new pipes - they're only about £5 each, with new seals already fitted to them. The advice already given to you; to just fit new pipes is quite sound.

 

[Olivier]

You might want to have a look at the tank strainer that is probably blocked, or partially. A pain to take off. But I would start there, then do the clear pipes.