Yes, we have been down this road before just not far enough. Daily driver, running fine-go in for lunch, come out and no start. Have changed all the plastic lines, fuel shut off (it is working) and crank position sensor. Am getting fuel to the injector pump and the overflow line has fuel coming thru it but if I take off an injector line, there is nothing and if they ain't squirting-it ain't gonna run.

Some interesting things: hit it with ether and there is really no response at all. It changes it's tune a little but no interest in firing. Pull codes and there are zero issues which I find kind of weird in itself.
I keep coming to the injector pump but why would it be running fine and all of the sudden not work? Don't these fail gradually over time (as in it may get harder and harder to start)? I believe to glow system to be fully working as it draws current for the right amount of time but, again, I am getting nothing out of the injector lines.

I'm stumped. It's a stunning car and would be even more stunning if it ran.

How many miles are on it? When was last time it got new fuel filter?

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Jim

174k. New filter-all that has been changed. I even have a boat primer bulb in line so I can squeeze fuel into it. It's getting fuel to the injector pump as you can see mini bubbles flowing. Had an 87 300SDL and also currently have a 98 300D so I have sorta been thru this with both of those but changing the plastic tubes fixed it.
I am trying not to lead suggestions down this path but I think it is the injector pump but do not know why it would just suddenly quit working.

And I do not believe it is an issue but will add the fact that the last fill up was "mistakenly" made with biodiesel. That was all drained and replaced and I don't think that is the problem. If you take the plastic line that feeds the injector pump off when you're cranking it, it is spitting plenty of fuel.

My other response said it had to go thru the moderator. I guess I said something wrong...
174K
Fresh filter

If the stop solenoid fails to work will the fuel still flow through and back down return line ?,obviously no engine start but fuel flowing through system.

Nothing blocking exhaust ?

I actually did check the exhaust, all good. You can hear and feel the cut off relay click and like I said, I removed the line that runs to the injector pump and it flows pretty good when you crank it.

Give your K40 relay a quick smack or wiggle with the ignition on and see if you hear anything, it WILL prevent the car from starting and is incredibly common failure on W210's of any engine.

Passenger side engine bay (US) in the big relay box near the windshield, its the one with a bunch of 10amp red fuses onit.

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Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....

I thought about that and looked at it but all of the fuses looked good and there were no fault codes. What electrically would shut down pretty much a completely mechanical system? And what do I listen for?

Smacked, jiggled and whacked...not hearing anything. I would love for this to be the problem but keep asking myself "Why is there no fuel coming out of the injector lines?"

https://forums.mercedesclub.org.uk/index.php?threads/how-do-i-change-injector-pump-e300-w210.144522/

https://forums.mercedesclub.org.uk/index.php?threads/can-not-start-w210-e300td-99.75637/

I have no reason not to give it a try. In the scheme of things its cheap and easy to change so I am at least going to give it a shot before I screw with the injector pump. something electrical makes more sense than the pump anyway.
It will be a couple weeks before I get the part and get to it but keep those thoughts coming if you have something different.

hmmmm "And I do not believe it is an issue but will add the fact that the last fill up was "mistakenly" made with biodiesel."

biod will loosen any build up in the fuel system starting all the way at the tank screen. I would be shocked if the problem is the injector pump. I've seen an IP on a 98 E300 get to about 350k miles with owner made fuel. Unfortunately, he did not have anyone in charge of QC and at 350k it would not start with engine hot. He was lucky enough to find a new, old stock Bosch injection pump. Installed and car was like brand new. Anyway, has the spin on filter been changed since biod added? How long was it run on biod? How bout the screen in the fuel line coming into the top of the spin on filter housing? Has it been pulled/inspected? Make sure the o-rings are good in this area too. I'd loosen up the lines at injectors and pump/crank till you get something out.

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Jim

Fuel filter/plastic lines/o-rings/new screen all changed. Was only run on the bio-diesel for about 1/2 tank. Have literally taken the injector lines off of the injectors while cranking and am getting nothing but am getting good flow to the pump.
It was running fine. He drove it all the way from CA to MI (filled up with the bio in Chicago). Drove it around the Detroit area for a few days and then went to leave after a lunch and it wouldn't start. So whatever happened it happened suddenly.
I had been puzzled as to how a mechanical system could all of the sudden just stop working and the relay that also shuts the "throttle" to zero if it fails sorta fits the bill. I'm not ruling out that crud got into the injector pump but to fail all of the injectors at once doesn't sound right and the suddenness of it doesn't sound right. It seems that if it was crud it would hit one or two of the lines and be sluggish first and then maybe not start.

That being said, getting a new relay is cheap and easy to try before we go digging into the pump.

The shut off valves that I have seen fail have always failed where the car is slow to turn off after turning the key to the off position.

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Jim