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Old 12-29-2015, 07:13 AM   #1
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MBS Out of Fuel!

Is it true if your MBS runs Out of Fuel,it will NOT start unless it is Towed to a MB Dealer and Put on the Computer? Youroo!!
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Old 12-29-2015, 08:03 AM   #2
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On my previous diesels, I had to prime the engine if I ran out of fuel or lost prime. There were several valves in the fuel system and I opened one at a time until fuel squirted out and then went on to the next valve in the system. I started with the valve closest to the tank and worked toward the engine. Fortunately, all the valves (3 or 4) were in the engine compartment and easy to find. On our Sprinter class B, I'd hate to try to find the valves as things are pretty jammed in the engine compartment. Not sure if the owners manual shows any diagrams or not as to where the valves are located. Good luck!
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Old 12-29-2015, 08:18 AM   #3
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Is it true if your MBS runs Out of Fuel,it will NOT start unless it is Towed to a MB Dealer and Put on the Computer? Youroo!!
No. If you run out of fuel, which is pretty hard to do with how Benz calibrates the fuel guage with respect to the reserve capacity remaining in the tank. You need to sequence the fuel pump several times to allow the electric pump to prime the fuel rail .Modern diesels are instant start, as well as self priming. At least Benz has their fuel system that way.
Also, if you're so mechanically inclined, there is a bleeder circuit coming off the fuel filter, that allows complete evacuation of air in the line up to the filter.
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Old 12-29-2015, 09:26 AM   #4
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Is it true if your MBS runs Out of Fuel,it will NOT start unless it is Towed to a MB Dealer and Put on the Computer? Youroo!!

Just don't.

Really, it's really hard on the engine to run it out of fuel.

After changing many many diesel fuel filters, they are most certainly NOT instant starting and some aren't even self priming.


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Old 12-29-2015, 10:01 AM   #5
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I am trying to Verify that the MBS units Must be Hooked up to a Dealer Computer to (Run/Start) if run out of Fuel! It is Not mine,only trying to Verify this Claim from a Owner that just had it Happen! MB roadside paid for Rollback Tow to Dealership but Owner had to Pay for Return (60 Miles) to have ir returned to them! They called MB Dealership and they were told that just adding Fuel and Purging the filters and lines would NOT fix the starting issues,It had to be Hooked to the MB Computer to Reset the MB Sprinter! Youroo!!
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Old 12-29-2015, 10:11 AM   #6
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It's possible...


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Old 12-29-2015, 10:38 AM   #7
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Contacting a dealer might be required if following the procedure in the operators manual did not work. Hooking to a computer is not required. The fuel system is self priming if procdures are followed.
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Old 12-29-2015, 12:59 PM   #8
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Is it true if your MBS runs Out of Fuel,it will NOT start unless it is Towed to a MB Dealer and Put on the Computer? Youroo!!
1 Put 3-5 gallons fuel in tank
2 crank engine few seconds -- let stand 20 seconds
3 Repeat #2
4 crank engine while pumping fuel pedal until it starts
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Old 12-29-2015, 01:11 PM   #9
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Going to a dealership shouldn't be needed.


Very hard on the high pressure fuel pump which is very expensive and very sensitive to pumping dry. Don't do it! The high pressure fuel pump uses the fuel that it pumps as its lubricant. Poor fuel lubricity in the USA is already hard on the pump and running out of fuel only worsens wear and tear on the HPFP.

When I replaced a HPFP, I had air in my fuel filter, fuel rail, and HPFP. Cranking and running the electrical lift pump was not enough. I had to open the bleed line on the filter assembly and bypass lift pump to get most of the air out and then cracked a line on the rail to help bleed it. The system's self-priming often requires cranking long times that is hard on the HPFP and starter.

My engine is a 3.0L mercedes benz turbo diesel on an 07 Grand Cherokee.
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Old 12-29-2015, 01:55 PM   #10
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Contacting a dealer might be required if following the procedure in the operators manual did not work. Hooking to a computer is not required. The fuel system is self priming if procdures are followed.

Thanks for explaining it in a different way. Old ideas on diesel die hard it seems. They SELF PRIME, Benz that is. And thats what Youroo was asking.
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