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General E46 Forum
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Old 05-09-2014, 02:32 AM   #1
moswissa
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Join Date: May 2014
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Gas leak driving me nuts

quick question about fuel leaks. I searched everywhere about this. My car smells fresh gasoline when i leave it parked overnight in the garage. However while driving i don't smell anything inside the cabin. I checked the gas tube under the passenger seats its secured. the ground is dry i see no gas drops. my care is also throwing "P0174 system too lean"(cleaned IDC, MAF, checked vacuum leaks)

is it possible i can just be leaking into the chassis and not on the floor?

could it be a leaky injector due to bad O rings and its just leaking over the head. my car also has occasional long cranks.

I'm now gonna change the fuel filter with the pump also check O ring injectors.




thanks guys!
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Old 05-09-2014, 06:19 AM   #2
KieranG
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Starting with O rings is a good idea. My personal experience involved a crack on the top of the tank, slowly letting vapor up into the cabin. Everything had to be pulled to replace the tank, but now I am worry free. It doesn't seem like you have anything like I did, but good luck!
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Old 05-09-2014, 09:37 AM   #3
lszlszx
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First try to tell if it's coming from the engine compartment, or the rear of the car.
If it's the front, inspect the fuel rail, if it's the rear inspect evap lines under the car.
Then remove fuel pump cover and look for seepage there.
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Old 05-09-2014, 10:06 AM   #4
Tutankhamon
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A quick and easy check for you might be to just remove your back seat and check the fuel pump area for any leaks. That should take no more than 5 mins.
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Old 05-09-2014, 10:25 AM   #5
yoyomin
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check your injectors see if they are wet
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Old 05-09-2014, 01:21 PM   #6
moswissa
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ok cool got lots of good answers.

so far i checked the fuel line under the passenger seat and retightened it. I don't smell any gas inside the car its mainly when i walk around outside on the passenger side i can smell raw gasoline. are there fuel lines that run underneath the car along the passenger side?


IM gonna take the engine cover off and spray some brake cleaner on the injectors, do you think that is a good idea to check for O ring leak or is it dangerous to spray it there. i know this trick works with vacuum lines

thanks
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Old 05-09-2014, 01:24 PM   #7
yoyomin
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You don't need to spray anything on the injectors. If there's a leak the injector will look shiny.
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Old 05-10-2014, 01:13 AM   #8
moswissa
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Would i able to see that from just taking the engine cover off. I'm gonna do this tomorrow
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Old 05-10-2014, 01:16 AM   #9
always-there
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Originally Posted by moswissa View Post
ok cool got lots of good answers.

so far i checked the fuel line under the passenger seat and retightened it. I don't smell any gas inside the car its mainly when i walk around outside on the passenger side i can smell raw gasoline. are there fuel lines that run underneath the car along the passenger side?


IM gonna take the engine cover off and spray some brake cleaner on the injectors, do you think that is a good idea to check for O ring leak or is it dangerous to spray it there. i know this trick works with vacuum lines

thanks
I had the same issue once and it turned out to be the cover on the fuel pump that was loose. Also, the seal wasn't completely on properly and it would smell extremely potent. Take the cover off the fuel pump and inspect it, and make sure you tighten it. Also check the fuel filter and make sure the hoses are on tight. When I had that issue the fuel was seeping out of the tank to the undercarriage, where it was soaked in fuel. I'd never see where the leak was coming from because the undercarriage would catch it and absorb it.

Last edited by always-there; 05-10-2014 at 01:18 AM.
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Old 05-10-2014, 08:32 AM   #10
markusmarkus
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Originally Posted by moswissa View Post
ok cool got lots of good answers.

so far i checked the fuel line under the passenger seat and retightened it. I don't smell any gas inside the car its mainly when i walk around outside on the passenger side i can smell raw gasoline. are there fuel lines that run underneath the car along the passenger side?


IM gonna take the engine cover off and spray some brake cleaner on the injectors, do you think that is a good idea to check for O ring leak or is it dangerous to spray it there. i know this trick works with vacuum lines

thanks

The fuel lines on my 330Ci run along the drivers side. You are driving a righthand drive bimmer, are you?


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Old 05-10-2014, 04:26 PM   #11
moswissa
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no left hand side.

this morning i changed the right fuel pump and made sure everything was tight.

I have a new fuel filter handy but i don't have a lift to change it
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