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Fuel leaking at the rear of engine, exhaust emissions causing soot and fumes inside car

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Is your exhaust loud? does it sound like its coming from inside the engine bay (if its loud)? it sounds like you need a tune up and you have a exhaust leak......check fuel lines to make sure theres no pinholes....youll be able to tell when the cars key is clicked forward but not careful

Posted on Sep 30, 2008


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My 1999 chevy blazer is running rich where I smell fuel fumes can this cause the truck to loose power and not go over 30 but the engine runs smooth

Most likely, A good "burn" is the right Fuel-air mixture. Too much fuel bad burn lots of black smoke. Not enough fuel It may not burn at all. Any emission codes? I will bet it won't pass an emissions test, so get it fixed. Probably affects mileage. Do you smell fuel in the engine compartment? you have a dangerous leak. Or do you smell at exhaust? Do you smell in the cab?
Probably leak in engine bay, or even under the truck's fuel line, filter, pump. or tank.

Mar 09, 2015 | Cars & Trucks

1 Answer

The code P0422 per oBD diagnostic is evap emission control has little leak. Where is that evap emission control located?

you have something allowing the gas fumes to leak out of your emission system is what code po422 means if you replaced your gas cap and this code came back after resetting your check engine light then some where in the vent line between the fuel tank and the intake there is a leak that is allowing the gas tank to depressurize which will turn on the light and cause your cars ecm or computer to go into (limp mode) this is a preset program which allows the driveline to operate at a non optimum setting or diagnostic setting meaning it will get lousy gas mileage until repairs are made and the problem is fixed as far as being safe to drive it could be very dangerous depending on how bad the leak is and weather the car has exhaust leaks also you are dealing with gas fumes closed in say like parking in a garage where these fumes can build up it can be very dangerous if enough fumes build up in such a instance out in the open not very bad at all

Sep 01, 2014 | Cars & Trucks

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How can I pass an emissions test with the trouble code of p0420 on 2000 Cadillac deville. Without getting it fixed right now.

Possible Causes:
  • Air leaks at the exhaust manifold or in the exhaust pipes
  • Base engine problems (i.e., high engine oil or coolant usage)
  • Catalytic converter is damaged, contaminated or has failed
  • Continuous engine misfire conditions, or weak or low coil output
  • Front HO2S or rear HO2S is contaminated with fuel or moisture
  • Rear HO2S is loose in the mounting hole (check it for a leak)

Jul 28, 2014 | Cars & Trucks

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Fumes inside vt wagon

Possible exhaust gas leak which particularly with the window down will draw fumes into the car. Look under your car for signs of a blow( should see soot marks) or start it up and listen underneath.

Jan 22, 2012 | Holden VT Cars & Trucks

1 Answer

My 1994 dodge caravan has a slight exhaust smell inside the car while running. any ideas?

Three things come to mind. You may have an exhaust system leak. Or, the rear hatch is not closing good, or not sealing properly, allowing exhaust fumes to enter the rear compartment. If you drive with the rear windows open, the exhaust fumes will be drawn into the vehicle while the vehicle is moving. Just some ideas on where to look for the source of the fumes. Don't take the problem lightly. The fumes can be deadly, or at the very least, make you ill.

Apr 01, 2011 | 1994 Dodge Caravan

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Gas order inside vehicle - could this be caused from the fuel pressure regulator?

If it is a gasoline ( raw fuel, unburned) smell, it could be caused by a number of fuel line related problems and leaks including the fuel pressure regulator. If it is an exhaust smell, check for an exhaust leak in or near the engine compartment.
There should be a cowling hood seal at the rear of the hood that is supposed to keep those fumes out of the passanger compartment.
Good luck.

Jan 30, 2011 | 2000 Oldsmobile Alero

3 Answers

Code po442 small leak (emmisions). How should i trouble shoot this problem? Could an exhaust leak cause this code to come up?

P0442:Evaporative Emission System Leak Detected (small leak)
what this system does is collect and store gas fumes, it also uses vacuum to detect any fuel tank or line leaks, it has zero to do with exhaust leaks, this code is often caused by a loose gas cap or a defective gas cap, so check the gas cap and make sure it is properly secured, if it is clear the code and see if it comes back, also never fuel the car with the engine running or the key turned on, this will trigger P0442.

Dec 06, 2009 | 2001 Pontiac Grand Am SE

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Vehicle smells like gas both inside and out of car after engine is off. Check Engine light is on but no noted deficiences noticed, all fluid levels good. what could be the problem?

If your check engine light is on when the car is running, then that means there is probably a trouble code stored in your vehicles computer. With a code reader, you can find out what the code is. That will direct you to the problem. You can post your code here and we will tell you what it means.
Regarding the 'gas' smell, first check to see if your car is running 'rich'. You can rub your finger inside the tailpipe and see if there is a lot of black soot there, which would indicate its running too rich (too high of a fuel to air mixture). If this is inconclusive to you, remove the spark plugs and check if they are with black soot on them where the pin is. This will tell you how the engine is running in terms of fuel mixture. If they are black, then you have found the problem (fuel injection problem or Oxygen sensor, most likely). The trouble code might also point to this. Other than that, sometimes an exhaust leak can cause fumes to leak up into the car when running. My car had the gas smell problem and it was both a hole in the exhaust under the car and an overly rich fuel mixture. I had black soot inside the tailpipe and black sooty spark plugs and the final problem ended up being a bad oxygen sensor (located on the intake manifold), that was sending an improper signal to the vehicle's computer, thus the reason for the problem.

Sep 24, 2009 | 1996 Dodge Intrepid

1 Answer

Gas smell inside of vehicle

usually youll have an engine check light on for an emmission problem,could have damaged hose,check for fuel leak,tank,fuel lines going to motor.

Mar 03, 2009 | 1996 Jeep Cherokee Country

1 Answer

Soothe inside car

I'm not sure what you meant by 'soothe' but am assuming smoke or soot?

If you are smelling anything like exhaust fumes, it would take a combination of an exhaust manifold or header leak and an air intake that is damaged and drawing it into the passenger compartment, a dangerous combination that could cause drowsiness and potetnially loss of consciousness.

You should have a mechanic inspect under the hood, it could be a dangerous problem.

Jul 02, 2008 | BMW 525 Cars & Trucks

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