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cropduster 08-14-2019 12:39 AM

99 E300d hard cold stsrt
Have a new to me 99 that runs great, but itís a real hard starter. New glow plugs, relay is fine, o rings were replaced on plastic lines. Injectors rebuilt, new filter. The prevailing theory is either air in the lines, which I canít see, or a weak lift pump. My idea was to place an electric helper pump around 5 psi on the supply line just as it enters the engine compartment. Would this help me out?

Father Of Giants 08-14-2019 08:37 AM

Did you replace the shut off valve O ring as well? Does your car leak fuel at all?
A leaky shut off valve is known to do this.

jay_bob 08-14-2019 03:15 PM

Yep be sure the o-ring between the shutoff and the pump is good. Also don't forget the o-ring on the 'pool strainer' pre filter. If any air gets in the system on this engine, you are going to have a hard time. Get an LED flashlight and shine it behind the clear hoses and look for bubbles after it has sat. Park it nose up to enhance the process.

You may want to think about replacing the SOV due to age, mine had a crack in it, and it was leaking fuel out the connector.

R.Diesel 08-14-2019 04:29 PM

How about doing the obvious first and check compression. If itís good there is no need to jerry rig some home made solution.

Father Of Giants 08-14-2019 07:18 PM


Originally Posted by R.Diesel (Post 3950106)
How about doing the obvious first and check compression. If itís good there is no need to jerry rig some home made solution.

Compression isn't the issue. My SDL has crap compression on two cylinders and it fires right up. OP claims it runs fine.

cropduster 08-16-2019 02:00 AM

Now itís missing on cylinder 5. Cracked lines to see which one and 5 makes no difference. Made a odd mechanical clatter and started missing after that. Is something ruined or just the injector?

83w126 08-16-2019 06:06 AM

Definitely fix all the fuel leaks first, Did you use the proper size and material o-rings on the fuel lines and change them all? Changing the delivery valve seals and shut off valve o-ring, fuel filters and the rubber line from the hard lines to the engine would help too. Get as much of it from the dealer as you can, trying to save a few dollars by not using quite the right part is basically installing an "unreliable beater" conversion kit.

Father Of Giants 08-16-2019 08:35 PM

Hold up OP. We need the WHOLE STORY. First you said it was running fine, now you say the engine is missing.

So the car all of a sudden developed miss?

cropduster 08-17-2019 01:48 AM

Well people are telling me I donít have compression on that cylinder based upon how it sounds on startup and to check valve clearances. Is that even possible on a om606?

jake12tech 08-18-2019 07:54 PM

Whoever said check valve clearances... ask them how you check the clearances on an engine with hydraulic lifters! :rolleyes:

How can someone also tell if it has poor compression without physically doing a compression test? :rolleyes:

Take a video and let’s see what’s going on

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