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Old 02-21-2013, 05:24 PM
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1999 E300D No Start-Fuel Flow

Just bought a beautiful one owner 110K, '99 E300D that was garage kept and had all the receipts since new. Ran perfect for exactly one week, then refused to start, cranked and cranked, no start. Only problem with the car was a leaking plastic fuel line from the filter to the SOV. Noticed small amount of fuel on the ground and below the SOV at this time. So I ordered and replaced all the plastic lines, SOV o-ring, the filter and pre-filter (w/oring) last night. Cranked and cranked(5 times) on a level surface with 1/2 tank of gas and still no start. Checked the SOV and it is clicking so it should be fine and I assume the K40 is working ok if it clicks. I noticed fuel in every line except for the line from the heater to the pre-filter( Line 1 in diagram), it is completely empty. Does this indicate a problem with the heater itself or the fuel lines to the heater? Do you think the in tank filter suddenly clogged? If so would I not have seen a bunch of junk in the prefilter/fuel filter? What is the next troubleshooting step I should take or part I should replace?
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Old 02-21-2013, 05:28 PM
deltajetfixer's Avatar
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Make sure lines 3 and 4 aren't reversed at the lift pump.

Happened to a close friend of mine...
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1982 320i
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Old 02-21-2013, 05:37 PM
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make a setup to suck diesel fuel from the prefilter feed line, if you can suck it up easily then the screen is clean enough to flow at least startup fuel.

At this point you should look into the above recommendation and check the pull and push lines of the lift pump,
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1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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Old 02-21-2013, 06:22 PM
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Did you fill the secondary filter with fuel before installing it? If not, it can take a lot of cranking to get the air out of the system since I don't think you have a manual primer pump.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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1999 Fuso FG Expedition Camper
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Old 02-21-2013, 08:12 PM
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Yes I did fill the pre-filter before cranking. I will check the lines, now that I think about they may be crossed. I have a Mightyvac so I can try to suck fuel from the tank to from the pre-heater. Any other lines aft of the pre-heater that are prone to failure?
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Old 02-21-2013, 09:06 PM
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The crankshaft position sensor can cause starting problems on the 606 engine, too. I had one with a lot of fuel leaks but still refused to start after repairing them. Crank sensor fixed it right up.
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Old 02-21-2013, 10:20 PM
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Location: Walnut Creek, CA & 1,150 miles S of Key West
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Do like Delta said...I remember that friend of his.

Confirm all your new lines are seated properly and that the horse shoe clips are all retracted (loose and floppy) after installation.

Having done that, if you still have zero fuel from the fuel thermo to the prefilter than you must have a leak somewhere from thee back to the tank which is causing loss of suction to pull the fuel up the the SOV.
Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
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Old 02-23-2013, 05:50 PM
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Fuel lines at the lift pump were reversed!! Thanks for the replys.
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