06cls55amg

so i started to notice a smell of fuel the last few days, especially when i idle for a bit it will start to seep into the car, as well as it smells out side. I know its form the outside because my furnace is in my garage area and it pulls air from the garage and then into my place. also if its idling for a bit and i step out you can smell it. wtf is going on? also no CEL .

novae500

Either one or both of your fuel sending unit/pumps are leaking. You can pull the rear seats and unbolt each panel to reveal the two units. There are several posts on this recently. Usually happens when your tank is full of gas and smell will slowly disappear as the volume of gas is used.

06cls55amg

car is at 1/4 tank, and smelled up the house at half a tank. to be honest didnt smell anything the 1st day or 2 after fill up.

Critter

If you are smelling gas then do not park the car in the garage with a furnace in there also. Fumes from the gas that you smell could be pulled into the furnace and ignite. Until you find the source DO NOT PARK THE CAR IN THE GARAGE, this is for your own safety.


This is another case where it is unbelievable why Mercedes Benz would allow a potential issue of leaking fuel pumps in their cars to continue, without having a recall and inspection or refit to a superseded design. Does somebodies house or family need to be harmed before they get off their asses. Just where is the Transportation Safety Board on this issue???

emncfi

Our M113 K engine had a fuel leak from either an injector or the little round regulator that sits on the back of the fuel rail. When on a road trip we would notice a strong smell of fuel when we stopped the car. I was initially thinking senders but since we had about 1/4 of a tank when it started it seemed it must be something else. After sniffing around, the strongest smell was coming from under the hood. Drove the rest of the way home, where I pulled the fuel rail and had the injectors rebuilt and replaced the regulator. No fuel smell since then.

06cls55amg

so no CEL will be given if injector is stuck and or fuel reg is faulty, correct?

Critter

To answer your question, I would have to say yes a code should come up because 1 if the injector is stuck there is a constant flow coming from it which would be sensed by the o2 sensors which would try to lean out the bank as a whole. In the second fuel regulator a similar code should present itself because the atomization of fuel would be compromised.
What ever the issue, leave the car outside until the issue is found and repaired.


A quick check under the hood should give you an indication if that is where the smell is, or remove back seat and check the pumps for leakage.

06cls55amg

well of course the car is no longer producing the smell now that i have time, and suggestions of where this smell might be coming from. let it idle for a few minutes as always smell nothing, went for a drive came back smelled around the wheel wells, engine bay, as well as exhaust... no smell. will try to pop open the back seat and check the pumps/sending units.

Critter

By chance you do not have the lawn mower in the garage also? Could maybe depend on how much fuel is in the tank, but a look at the pumps would be not wasted time.

06cls55amg

no lawn mower, just the benz

Critter

That would be too easy,

shardul

iTrader: (1)

check the driver side sending unit for fuel residue.

06cls55amg

im starting to believe its from the bonnet after all, tried to pull the seat but cant seem to find the release lever or push pin that im suppose to push to get it to release. anyways, when i got to work i smelled a faint fuel smell and smelled around the rear seat and they smell fine, popped the hood and could def smell something not sure where exactly closed it and smelled around the exhaust and wheel wells. Still nothing, decided to smell around the hood vents and it definitely has a fuel smell coming from it, so now i need to narrow down where from. car is still under warranty from where i bought it from so i might as well get stuff fixed. I hope they dont say that this is a wear item.

zombiescustoms

I too have the same smell on my 06 E55, checked both the sender and the pump under the seat, and nothing, dry and clean. I notice it only at initial start up in the morning, usually when the tank is near empty, filled it up yesterday and this morning I had no smell whatsoever. It seems there are more than just the under seat leak issues with these cars!

06cls55amg

what he said ^ i think that im smelling fuel in my cabin as of lately because im actually having the heat on and its coming through the vents.

seriously was not expecting all these issues a month and half into owner ship of such an expensive car.

zombiescustoms

At least you have a warranty, I just picked mine up a week ago. I am lucky to have my own shop with a lift and can do most of my own trouble shooting. I will be digging into this over the next week.

06cls55amg

i do as well, but if its a stuck injector, or fuel reg then thats a couple hundred bucks . my warranty is through a used car dealer 60 days, 3000 miles. im actually afraid to call and tell them my issue because im sure they will fight me on it. put 1200 miles on my car and owned it for 4 weeks and feel like im all i am doing is fixing issues.

emncfi

For our car, we had no CEL or anything like that, just a real strong gas smell under the hood. In my opinion, it was the regulator on the back Passengers side of the fuel rail (little mushroom looking thing kind of) that was leaking, when I took it out there was a dirty residue on it. The injectors though had very different flow rates, some more plugged than others, so a good injector rebuild was probably necessary anyhow. All in all, it was a simple day job and about $200, 120 for the injector rebuild, and 80 for the regulator.

AgSilver

That mushroom thingy is pressure dampener.

06cls55amg

so since my last gas smell incident, i filled up my tank and the smell seemed to have gone away. once in a while i would think i smelled something when idling or driving but my passenger told me im going crazy.

So monday i started to smell fuel again, checked under the rear seat and it looks dry on both sides. Its not coming from the exhaust.

Ive noticed that the lower my fuel level goes the stronger and more frequent the smell gets, it seeps into the cabin as well as smells on the out side.

it seems like the smell is coming from the engine bay area but its not consistent , its on and off , as in comes in waves its weird. The strongest smell seems from the passenger side but who the hell knows at this point.

The thing that is weird is that it doesnt smell like fresh gas or like the scent you pick up from the gas station. its smells old, like real old and very pungent.

Seems like this fuel smell issue started after my car told me to tighten my gas cap and threw a p0505 https://mbworld.org/forums/w211-amg/...reset-wtf.html

I have no CEL but will hook up my scanner and see if anything is pending. Car seems to be driving fine but does seem like the idle is a little lumpy, and at wot doesnt seems as smooth, and power doesnt seem to be as aggressive, as it was when i first bought it. But i could just be over analyzing.

Car is bone stock other than putting in the the k&n drop ins.

so what do you guys think? evap tank, injector, regulator, un burned fuel?

zombiescustoms

might be a tank leak in another area besides the pump/sender normal leak points, hence it thinking the cap is loose.

06cls55amg

i havent had a cap loose error since that first time a few weeks ago, my fuel smell is from the engine bay.
NO CEL, no pending codes, no fuel on or around either sending units, or fuel tank.

can someone point out to me where the fuel related parts are in the engine bay so i can look. like evap tank location, regulator, etc.

zombiescustoms

start here
https://mbworld.org/forums/w211-amg/...-gas-tank.html

could be where the evap hose comes off the tank


also check the O-ring on the pressure dampener on the fuel rail

these are all spots i have gone through on mine.

06cls55amg

cool thanks, this is pissing me off because now that i have a full tank of gas i cant get it to duplicate the issue.

i put the car into my shop closed the doors, hooked up pipes to my exhaust and ran them out side, let the car run for 10 minutes and there is zero smell of fuel. which for the last few days with a few bars of fuel i would come out side and you could definitely smell fuel. I am seriously stumped.

Only thing i can think of that is different from the other days is that i went to lunch today and my car was not on an ice cold motor. but realistically even when i went to lowes on my way home from work last night, started the car and again was able to smell fuel.

ever since ive filled up this morning the car stops having its fuel smell. seems like once the fuel starts to go down thats when the smell reappears.

Any other thoughts?

I also removed the rear seat cushions and panels to see if i could find something . there is almost no scent at all, looks like someone has been under there before as well and replaced both units as they look brand new, and have a missing screw on each panel.

emncfi

I believe on ours that the pressure dampener o ring had enough, which is what I think was causing our leak. One other interesting thing on ours was that the fuel line that goes up in the engine bay near the drivers wheel well had a loose fitting. the fuel line comes up then goes from a hard line to a flex line, at the hard to flex (braided stainless) intersection is a 13mm nut joiner, that nut was finger loose, did not even need a wrench to get it undone.