I am 3rd owner of a 140km e300TD , also own an 87 e300td 175Km, (great all round car) bought the 1999 in summer 2012 , a garage stored car, never winter driven (means a lot here in Nova Scotia). Car worked perfectly last summer , stored for winter. This spring can began stalling while driving, check engine code P1622, replaced the fuel shut off valve and O ring, wire harness was OK, all fuel lines were replaced with new O rings, no leaks no bubbles, stalling continued every 125km or so. Replaced the K40 and fuel pump relay, battery is good, all wiring connectors appear to be OK.... Beautiful car but I am on a short leash, I am new to this organization and after reading so many good technical posts I thought someone may have experienced this stalling issue and found the solution? Very nerve racking when car quits and dash lights up at highway speed, Thanks
Best from Halifax

diesel purge & fresh fuel filter?

Recently after an extended period of in-town driving, I made a trip to NH & experienced a distinct lack of power, could keep up to posted speed limits but no joyful passing possible. A fresh fuel filter + a few runs up the longest, steepest hill in town cured it. A subsequent daytrip to mid-coast Maine a few days later found me on the interstate, mostly in the left lane w/grin on face the whole time.
Previous filter change was in the fall & I run biodiesel, blending as necessary, fwiw.

good luck & keep us posted

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1991 300D

If you're going to do a diesel purge, change your filters AFTER you do that.

Pour some stuff in the tank, maybe you have algae build up in there. Change out pre-filter, main filter, air filter if you haven't already done so. Maybe it's not getting enough air.

My car has never stalled but if it did, I wouldn't hesitate to call a mechanic; you could be in a deadly situation if it stalls at a bad time.

I'd keep looking at orings and electrial glitches personally although a can of fuel conditioner and two new filters wouldn't harm anything and arent expensive.

More info about when it stalls and how it starts back up would be helpful.

Did the SOV receive a new oring when it was installed? A leaky oring there can cause a stall and a run on/delayed shutdown condition.

Does it fire back up first turn of the key as soon as you roll to a stop? Always?

K40 relays can be bad in the box. Rare, but possible.

Could be a crank position sensor. Not a common failure either, but possible.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Sounds like blockage, restriction in fuel system. Are you sure there is no air in lines?

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-- Chris

'95 E300, 216k miles, Silver Surfer
'05 E320 CDI, 138k miles
'07 S550 4matic, 69k miles

Gone but not forgotten:

'76 300D, 350k miles?, SOLD in 1995
'75 240D, 300k miles, SOLD in 1991

When it stalls, immediately open the gas (fuel) cap. If you have a big SUCK then you know there is an issue with venting the fuel system. I had a lot of somewhat funky stalling issues on my '95 which were solved with a new lift pump. I don't know if the later turbo cars have the same lift pump or not.

Rgds,
Chris W.
'95 E300D

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Objects in closer are mirror than they appear.

Many thanks for your suggestions, really appreciate the input, this car is exceptional condition, with this one exception. The fuel filters are new, no algae problems with fuel not typically an issue in Nova Scotia. Engine is dry as a bone and all fuel lines were replaced with vitriol o rings no bubbles. Two new k 40 relays and fuel pump relays and a new fuel SOV with "o" ring installed without any improvement.
When car starts to hesitate and then stall all the dash lights come on and check engine light comes on and car must be coasted to roadside.then will not restart until it recasts for 10 minutes or so. Then it will start and seems to be in limp mode (kind of shaky) till I get it home or back to my mercedes mechanic who has 40 years under the hood of mercedes automobiles.

The longest the car has run this summer without stalling out is 200 km on. Highway. The battery was tested and although 5 years old is within spec and will crank the car no problem. The 1622 error code is supposed to be fuel related, not sure if Crank Position sensor is or can be related to 1622, but will take car back to shop and ask if this is possibly the cause of stalling . Thanks again!