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Discussion Starter #1
I understand one is going to smell diesel fuel, due to what we drive, but when at idle the cab of the truck gets a strong fuel smell. I also noticed when I changed out the stock exhause for my MBRP (this week) you could smell unburned fuel in the exhaust. Does this mean anything, or is it something for me to just get used to?
 

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Double check your down pipe band clamp and make sure its tight and go over the whole system. Its not normal to smell fuel or fumes in the cab.
 

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are you smelling fuel or exhaust? i have a 5 inch straight pipe and if im at a light with the windows down i can smell the exhaust so i dont know if thats bad or not.
 

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If you're smelling fuel then there is a extrenal leak some were. Does your truck smoke?
 

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I have the same problem. I've narrowed it down to a banjo fitting from a tube coming off the CP3 up to the common rail or one of the fittings on the tubes going to the injector. I've also heard that the fuel return line sometimes likes to leak. I don't know exactly where the return line is but supposedly it runs down the back of the engine. Some places to start looking anyway...
 

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Discussion Starter #6
It has a fuel smell. No leaking or evidence of leaking on the engine or the ground. It was at the dealer and I told them about it. The only thing they found was I had a bad hose from my radiator that was leaking fluid, otherwise they said the engine was perfect and everything was normal. We all know that a dealer will find crap wrong with a truck in order to make money, so if they cleared the truck as OK then I'm thinking they're right.
 

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put some UV dye in the fuel tank
run for a week and get out the black light

check around tank and lines to engine

another place to check closely are the fuel injection lines from the rail to the connector tubes.
#4 is prone to cracking.
 

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Discussion Starter #8
interesting, uv dye in the fuel tank. new to this, but where can i find a picture that shows what the rail connector tubes and fuel injection lines are? and where is the #4?
 

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The line he is talking about is on the driver's side of the engine. It runs from the rail into the head. The clamp that you should check is the on with blue softeners on each side. #4 is the fourth one from the front of the engine.
 

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I would double check the turbo elbow clamp or the downpipe and make sure all the clamps are TIGHT
 

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I would double check the turbo elbow clamp or the downpipe and make sure all the clamps are TIGHT......
 

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My truck is actually doing the same thing, but mine is an exhaust smell, my exhaust fumes are always very strong around the outside of the truck for some reason, and i can smell em when i'm idling inside if i dont have my fan on recirc.
 

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Check the seal at the top of the cowl area under the hood. Sometimes it can fall down a little and you will get fumes in the cab. A little 3m adhesive and you are back in business:thumbsup:
 

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will do thank ya much
 

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Discussion Starter #17
appreciate all the help. at least i know i'm not the only one getting the stinch.
 

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mine was actually 2 things, a leaky exhaust and a hole in the firewall under the drivers side i forgot to re seal it after i took my wiring out of it
 
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