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#1
03-22-2011, 11:19 AM
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Replaced K40/fuel lines still no pumping
I have replaced the K40 relay and all fuel lines and o-rings on my 1999 E300 turbo and it still will not pump fuel up to the injectors. I hear the shut off valve click when the key is turned but no fuel ever comes out of the delivery valves ( I can see because I haven't re connected the injector lines.)
Can the shut off valve click and still be bad? What else in the system could stop the pump? When the car stopped working it completely died. It never fired a bit when I tried to start it. It had been running OK but I had the problem of it dying after starting so I did the normal parts replacement as suggested. 
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#2
03-22-2011, 11:53 AM
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Basic question: if you disconnect the return fuel line and put it in a jar, then crank do you get fuel in the jar? (there is an official spec for a 30 second crank, I don't know it.) This will test the fuel system through the lift pump.
Jim (You probably already checked this, but I thought I would make sure.)
__________________
1995 S350D, Green with black leather interior. Bought January 2008 w/ 233,xxx miles. I did 22,000 miles during the first year of ownership.
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#3
03-22-2011, 02:04 PM
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1) Is there air in any of the fuel lines?
2) Have you double checked the way the lines are routed? You wouldn't be the first person to get the lines from the lift pump to the cannister filter and back to the SOV on backwards. 3) Tried disconnecting the line from the lift pump and cranking to see if fuel is making it past that point up to the cannister filter and back down to the SOV?
__________________
Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#4
03-22-2011, 03:07 PM
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There is fuel in both lines going down to the SOV.
The only line that doesn't show fuel is the one from the engine block side of the injector pump going back up to the return fuel junction. I followed the diagram found on this site. The center line from the fuel filter assembly goes to the front of the SOV and the line coming from the back side of filter assembly goes to the back side of SOV. The strange thing is, when I stop cranking the fuel flows backward from the pre filter toward the fuel heater so it looks as if there is no fuel. But as soon as I crank again the line fills with fuel. This does not happen if I jack up the back of the car. The tank is full. I replaced the pre filter and o rings. I can't find the link that shows the fuel diagram again so if anyone knows where it is please post it. I have seen some references to SOVs going bad. Is there a way to check them? It makes a clicking sound when the key is turned but does that prove that it's OK? How long do you need do you normally need to crank to get the system primed? I filled the filter before putting it on with new o rings on the bolt that attaches the filter.
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#5
03-22-2011, 08:31 PM
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So, the line comming from the bottom of the prefilter down to the sov has no fuel?
Did you replace the $.25 (as in as big as a quarter) sized oring on the underside of the prefilter? Sure that its installed?
__________________
Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#6
03-22-2011, 09:14 PM
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Both lines to the shut off valve have fuel in them. I did replace the o ring under the pre filter.
The line that doesn't have fuel in it is the one from the engine block side of the injector pump (attached with 17mm bolt) that goes up to the tee that is the return line junction on the passenger side of the filter assembly.
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