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Old 12-19-2017, 06:23 AM   #1
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Raw gas smell

when I start my car and when I press the gas to go I get a strong smell of raw fuel. Has this happened to anyone else and what would make this happen in a fuel injected car?
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Old 12-19-2017, 06:37 AM   #2
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Quote:
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when I start my car and when I press the gas to go I get a strong smell of raw fuel. Has this happened to anyone else and what would make this happen in a fuel injected car?
Are there any modifications; and if so, what are they?
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Old 12-19-2017, 06:52 AM   #3
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the only thing is an axle back
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Old 12-19-2017, 07:38 AM   #4
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Can you tell where the source of the smell is?

At the moment it sounds like the car is warming up. A cold engine will not burn as much fuel as a hot engine. Also, the car's ECU is programmed to dump excess fuel upon a cold start up in order to keep the engine from stalling.

Everything is more than likely fine.

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Old 12-19-2017, 08:54 AM   #5
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Is the fuel smell a new occurrence? Or has the car done this the entire duration of your ownership?
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Old 12-19-2017, 09:31 AM   #6
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Have you done any recent work? Changed anything?
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Old 12-19-2017, 12:42 PM   #7
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i changed spark plugs, everything was torqued properly and checked and rechecked all electrical connections and all is good. no error codes. i can not tell you where its coming from but it is very strong in the cabin.
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Old 12-19-2017, 12:47 PM   #8
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this just started about a month ago, the axle back and plugs were done in the summer ,
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Old 12-19-2017, 01:35 PM   #9
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Look for leaks, especially around the fuel rails and injectors. Something could have been pulled or torn when the plugs were changed.
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Old 12-19-2017, 10:56 PM   #10
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"A cold engine will not burn as much fuel as a hot engine."

Huh? Ever hear of a "choke"? EFIs "choke", too. Cold engines need MORE fuel than hot ones.
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Old 12-20-2017, 04:07 AM   #11
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I think he means more raw fuel out the exhaust that is unburned when running rich while cold!!
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Old 12-20-2017, 06:22 AM   #12
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no leaks at all that was another first i looked at, running and stopped.
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Old 12-20-2017, 06:38 AM   #13
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Quote:
Originally Posted by 65 k car View Post
"A cold engine will not burn as much fuel as a hot engine."

Huh? Ever hear of a "choke"? EFIs "choke", too. Cold engines need MORE fuel than hot ones.
A choke essentially floods an engine with fuel by choking the amount of air flow. You end up with a very rich situation until the engine is warm. You end up with raw fuel being pushed out of the exhaust valves. Too much fuel and you find yourself with soaked plugs that refuse to fire.

EFI and direct port injection does not have a choke. The air/fuel mixture is controlled by the ECU.

Again; a cold engine cannot burn as much fuel as a hot engine. Delving into this specific topic is more than I care to explain at the moment. However, if you want to see a new(er) car run rich and destroy catalytic converters, or just dump excess fuel into the exhaust, pull the thermostat and let the coolant run freely. The engine will be inefficient, and will ruin the plugs, coat the valves with carbon, as well as clog the converters.

There is a proper A/F ratio, and a cold engine isn't going to achieve it.
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Old 12-20-2017, 06:39 AM   #14
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Quote:
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no leaks at all that was another first i looked at, running and stopped.
Have you pulled any of the plugs to see what they look like?
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Old 12-20-2017, 02:21 PM   #15
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not yet to damn cold lol
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Old 12-20-2017, 02:23 PM   #16
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not yet to damn cold lol
It is a little cold in the NE.
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Old 12-20-2017, 06:27 PM   #17
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Check your gas tank, the older they get the more likely they are to split at the seam although I've never had it happen to me on a stang. My old Honda I sold needed a new tank because of this tho...

If not... fuel lines, look for leakage by injectors, where the fuel line connects to injectors etc...
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Old 12-21-2017, 06:20 AM   #18
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I have looked under car, no leaks or wet stops I can see. under the hood the same. i will check the tank and the lines near it again.
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Old 12-21-2017, 05:47 PM   #19
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Check for just a minor discoloration around the seam of the gas tank and underneath... although I think the 05+ have a cover over it like the 04-down does... I dunno man... Raw gas=bad. Gotta be a leak somewhere IMO.
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Old 12-21-2017, 05:50 PM   #20
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You could always toss a lit flare under the car. The gas will find the flare. 😲

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Old 12-21-2017, 06:33 PM   #21
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On the previous generation, there was a problem with the filler neck rusting out, causing a fuel smell inside of the cabin, particularly after refueling the car. Not sure if that is a problem with the later generations, but it is something to check.
It's strange that your car only seems to do it immediately after start up and driving away. Almost like it is being caused by a rich condition upon startup.

Just so that we are all clear, does the smell seem to be absolutely a raw fuel smell? Like if you set a half-filled coffee cup of gasoline in the cup holder?
Or does it seem to smell like an overly rich mixture of partially burned fuel exiting from the exhaust pipes?
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Old 12-22-2017, 03:03 PM   #22
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What year car is it??
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Old 12-23-2017, 07:04 AM   #23
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07 GT. and yes RAW GAS.... like a carb that's float bowls at stuck open.
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Old 12-23-2017, 07:18 AM   #24
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Well... I dunno my first step would be to pull and rebuild every injector. You need a $14 ebay rebuild kit and a #10 sheetmetal screw to get the old filters out. That right there could be the issue and if not its just good maintenance anyway. Getting injectors out is easy.
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Old 12-23-2017, 02:21 PM   #25
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If you are positive that the smell is not coming from the exhaust pipes, you need to carefully inspect the entire fuel system... From the filler neck to the fuel injectors.
I had a leaking fuel rail on my old truck a while back. It didn't really smell while being driven, but if I shut it off for a few minutes, and then got back in the cab, it was pretty obvious that there was a leak somewhere.
This isn't something that you should procrastinate on. Unless of course, you have excellent comprehensive coverage on your insurance policy.
As Revvv already alluded to, eventually a spark will find your leak for you.
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Old 12-23-2017, 05:22 PM   #26
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Tuner I am using had the opposite problem... in the month this guy's rails were off his car a bee or hornet or something made a nest in the rail. 2 cylinders just were not getting fuel and they couldn't figure out wtf was going on lol.
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