the fuel pump relay and fuse are located in the right rear corner of the trunk.

if it were a defective relay or fuse the vehicle would not crank.

 

the fuel pump relay and fuse are located in the right rear corner of the trunk. if it were a defective relay or fuse the vehicle would not crank.

Even if the fuel pump relay is bad the vehicle would still crank. Fuel pump relay has nothing to do with ignition system or battery it will crank all day with a bad fuel pump relay

 

The fuse pump relay and fuse are located (as stated previously) in the right rear load compartment fuse/relay box.

If you did not transfer and relay or fuse in that location, then that is not your problem.

Take a photo of where the relay was and what relay you removed and what relay you swapped it with.

 

43sqd - is the yellow arrow identifying the Fuel Pump Relay?

Thanks

 

Hey Guys, My '06 ML500 decided not start in the morning today. It was weird since last night it was totally fine. I cranked it up and it tried but not start. I did that like 10 times but fearing that I might eat out the battery or fry the starter I decided not try again. I fine tuned my ear and noticed that upon ignition the fuel pump sound was missing. Came here, searched for the fuel pump location (because of all the freaking cars that I've owned this is the one that doesn't have a fuse diagram! :-S ) checked it up on the car and and Voila! the stupid 20amp fuse was broken. Slipped in the replacement and good as new!

Thanks for the picture with the location, once again my car is running thanks to you guys!

Cheers!!!

 

Did you figure out this problem?

 

You have to explain your own problem.

 

I have a ml320 cdi, mine stops after 3seconds, and it smells like something is blown in my fusebox, so thats why i want to ask benzomi what fixed his problem, maybe it is some wrong with mine relay, because my air suspension play wierd right before my car stops.

 

What fuse box, where?

 

Fuse/relay box under the hood

 

Jon, this is why I asked you to tell your own story, but you really arene't.

So you smelled the fuse box and what did you do after that?

 

I try to search for what can cause that my engine will not run.

I liftet my car om the highest offroad-level, and when i pusth the button for lowering the car, nothing happend, (when the engine idle ofcourse).

Then i just turn of the engine, the next time i tried to start, the engine stops after about 3seconds, right before the engine dies the glow-light in the dash lights. Less than 1second, i can turn ignition off and rhen do the same, still dies after 3 second every time, when i opened the fusebox, i could smell that something electric har burned, and i feel that it came from the green hella relay tha suposed are for the suspension.

 

Please UPDATE YOUR PROFILE in USER CP to include the year, model and where you live.

Then post your full vin#.

 

Please UPDATE YOUR PROFILE in USER CP to include the year, model and where you live.



Then post your full vin#.

I try to update it, but i got error


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Did you remove the Hella relay?

 

I removed it, burt but it back


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I removed it, but i put it back


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I checked the fuse in this box, no power on the 40a big fuses, i checked ofcourse both sides og the fuse, when the ignition is on, should it be power at this fuses? Maybe ic could be a fuse somewhere else?


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OK, change W164 to ML 500.

Then post your full vin #.

 

After you removed the relay, why didn't you try to start the eng. and see if it remained running?

 

I tried to start without it, but the starter would not turn. This relay has to be mounted to start the motor. But it stops after 3 second everytime


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You posted hear because you were asking about a problem with the fuel pump.

Please tell me the relay number in the fuse box that you are referring to.

 

Its green relay number 3 from bottom,


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When i put ignition on , not starting, i can hear the pump, it will not stop running, i think it is the pump atleast


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So if you remove that relay does the pump stop running?

And you never said the pump was always running. You said you couldn't start the car.

 

I can start the car everytime, but it allways stops after 3second


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I can check tomorrow, but chould the pump normally stop after a couple second when the pressure are good?


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I do not understand what you are trying to say because there is a language barrier.

The air pump relay only controls the air pump and has nothing to do with the eng. running.

The relay on the bottom does control the starting of the of the eng.

You might have a damaged fuse box.

 

I agree about the green relay no.3 should only work at the air-suspension. But when i remove this relay nothing happend when i twist the key. Maybe it is some another relay that also is bad? I can smell a electric-burn when i opened this box, what relay should i look at in this case?


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Problem solved, i opened this fusebox, and i find a bad soldering, so i solder it and now tha machine runs perfect

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Problem solved, i opened this fusebox, and i find a bad soldering, so i solder it and now tha machine runs perfect View attachment 2408481

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Good morning ALL.

I am new to this forum but optimistic I can get guidance from experts thru here.

I have an issue with my ML. My airmatic system has been acting funny lately. I've replaced all air struts (front and back) but the passenger front still rides low.

I read about the relay going bad after some time so I decided to replace it. The mistake I made was...I inserted a wrong relay into the spot (a relay with 6 prongs as the green one there...the one I inserted was black and not even sure where I got it from).

Immediately I inserted the relay I smelt something coming from the fuse box there. I quickly removed it and inserted the old one back. I went to start the car, the car will start every time, revs up but cuts off immediately right when the idle is about to drop down. I went to the fuse box and inspected all the fuses, all were fine. Inspected all the fuses in the trunk, all were fine.

I now called Mercedes to schedule an appt for diagnosis. I explained what had happened to the tech, the first thing he asked me was "did you do anything to the fuel pump relay?" The answer is NO unless the airmatic replay has something to do with the fuel pump.

Anyway, did he just give me a clue that could save me money and the trouble of towing the car to the dealership? Did I fry the fuel pump relay? Is it located under the hood near the airmatic relay?

Can anyone guide me to where the fuel pump relay is located and it's exact location?



Thank you.

Hi, i think you have the same problem i got, you have to open det relay box and check the wires on the board, mine was melted one place


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" The circle is now complete. When I left you I was but the learner. Now, I am the master! " If you're chasing down a no start , reference what I did to get back on the road again : https://www.benzworld.org/forums/w164-m-class/3012836-06-ml500-cranks-no-start.html

I place it in this thread as there was some speculation that Airmatic and Fuel Pump have some relationship - well there is a FUSE 53 that is common to both - explained in the ref thread.... good luck !