Gas smell

brandon444 · March 11th, 2011, 12:09 AM

Any ideas why every morning I get in my car and it smells like raw unburnt fuel?

hoffmabo · March 11th, 2011, 02:37 AM

Can I take a stab at exhaust leak? crappy plugs? anybody?

FastStang91Lx · March 11th, 2011, 04:18 AM

Someone comes to your house at night an puts raw fuel inside your car?

jessemachone · March 11th, 2011, 04:26 AM

There is a big ass grommet where your fuel fill tube goes into the tank. They get dry and leak. Go top off and see if it spills out or gets wet by there. If that is your problem, replace the grommet when you get to 1/4 tank.

It is best to drop your tank to do this. The tank and filler neck will come down together. Google for a write up.

brandon444 · March 11th, 2011, 09:10 AM

Originally Posted by jessemachone

There is a big ass grommet where your fuel fill tube goes into the tank. They get dry and leak. Go top off and see if it spills out or gets wet by there. If that is your problem, replace the grommet when you get to 1/4 tank.

It is best to drop your tank to do this. The tank and filler neck will come down together. Google for a write up.

That's a little bit what I was thinking, I'll try that thanksthanks

brandon444 · March 13th, 2011, 03:19 AM

Originally Posted by jessemachone

There is a big ass grommet where your fuel fill tube goes into the tank. They get dry and leak. Go top off and see if it spills out or gets wet by there. If that is your problem, replace the grommet when you get to 1/4 tank.

It is best to drop your tank to do this. The tank and filler neck will come down together. Google for a write up.

Ok so I got up under my car today, and that grommet is almost brand new and dry and clean around there, but I guess its the gas line maybe. Its in the middle of the car width wise, its right in front of the tank and a flexible hose runs to a fitting where from there it goes into a stiff line... so tell me what you think

ryanw · March 13th, 2011, 03:24 AM

So its on the return line ?...The supply line should be the one with the fuel filter.

If have that backwards please chime in some one

brandon444 · March 13th, 2011, 03:34 AM

I'm not sure about it but there's gas on the underside of the car and I think its leaking or something from where I described... and why would it need a return line?

ryanw · March 13th, 2011, 03:38 AM

I was just trying to picture where the leak was at.....

You do know that you have fuel return line right ?

In case you didnt know...Fuel travel up your supply line by the fuel pump then what ever your engine does not use get sent back to your fuel tank....

brandon444 · March 13th, 2011, 03:43 AM

Ok that makes since on the return line.

Ill get more in to it tomorrow and might drop the tank

FastStang91Lx · March 13th, 2011, 08:52 AM

Only the newer mustangs, and other fords for that matter, have a returnless fuel system. There is a spendy part that regulates the pressure back by the tank. Was at my buddies shop when he was replacing one on an 04 Ford f150. Can't remember what it's called.

Dap1991 · March 13th, 2011, 02:46 PM

I have this same problem, I notice a gas smell after driving the car and before driving, towards the rear of the car. When i get home for spring break i need to check the things you guys mentioned, I was also thinking possibly my return line because I figured if it was the "to engine" line leaking it would cause low fuel pressure and it would run rough/not at all. Does that make sense?

ryanw · March 13th, 2011, 03:07 PM

im thinking that you could still have a leak on the supply line and it not effect the engine if the leak is small enough.....But fore sure check the bushing inbetween the fuel tank and filler neck

Dap1991 · March 13th, 2011, 03:10 PM

Ya ill definitely be checking that, also, would the best way to find the leak would be to just crawl under the car while its running and look for spraying or dripping gas? I almost dont even wanna mess with it since the car is running fine but i figure it can only get worse.

March 11th, 2011, 12:09 AM	#1
brandon444 Regular 91 Mustang LX 5.0 Join Date: Jan 2011 Location: Haubstadt, IN Posts: 469 iTrader: 0 reviews	Gas smell Any ideas why every morning I get in my car and it smells like raw unburnt fuel?

March 11th, 2011, 04:18 AM	#3
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	Someone comes to your house at night an puts raw fuel inside your car? __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

March 13th, 2011, 03:24 AM	#7
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,058 iTrader: 0 reviews	So its on the return line ?...The supply line should be the one with the fuel filter. If have that backwards please chime in some one __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

March 13th, 2011, 03:38 AM	#9
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,058 iTrader: 0 reviews	I was just trying to picture where the leak was at..... You do know that you have fuel return line right ? In case you didnt know...Fuel travel up your supply line by the fuel pump then what ever your engine does not use get sent back to your fuel tank.... __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

March 13th, 2011, 08:52 AM	#11
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	Only the newer mustangs, and other fords for that matter, have a returnless fuel system. There is a spendy part that regulates the pressure back by the tank. Was at my buddies shop when he was replacing one on an 04 Ford f150. Can't remember what it's called. __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

March 11th, 2011, 02:37 AM	#2
hoffmabo Newbie 1986 Mustang LX Join Date: Feb 2011 Location: SD Posts: 36 iTrader: 0 reviews	Can I take a stab at exhaust leak? crappy plugs? anybody?

March 13th, 2011, 03:34 AM	#8
brandon444 Regular 91 Mustang LX 5.0 Join Date: Jan 2011 Location: Haubstadt, IN Posts: 469 iTrader: 0 reviews	I'm not sure about it but there's gas on the underside of the car and I think its leaking or something from where I described... and why would it need a return line?

March 13th, 2011, 03:43 AM	#10
brandon444 Regular 91 Mustang LX 5.0 Join Date: Jan 2011 Location: Haubstadt, IN Posts: 469 iTrader: 0 reviews	Ok that makes since on the return line. Ill get more in to it tomorrow and might drop the tank

March 13th, 2011, 02:46 PM	#12
Dap1991 Hardcore Enthusiast 91 GT 90 LX 5.0 Join Date: Aug 2009 Location: youngstown, ohio Posts: 1,025 iTrader: 0 reviews	I have this same problem, I notice a gas smell after driving the car and before driving, towards the rear of the car. When i get home for spring break i need to check the things you guys mentioned, I was also thinking possibly my return line because I figured if it was the "to engine" line leaking it would cause low fuel pressure and it would run rough/not at all. Does that make sense? __________________ 1991 GT- All Stock 1990 LX 5.0- CAI, Shorty headers, flowmaster, Tubular Upper and Lower Control arms, Tokico HP series, Eibach Springs

March 13th, 2011, 03:07 PM	#13
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,058 iTrader: 0 reviews	im thinking that you could still have a leak on the supply line and it not effect the engine if the leak is small enough.....But fore sure check the bushing inbetween the fuel tank and filler neck __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

March 13th, 2011, 03:10 PM	#14
Dap1991 Hardcore Enthusiast 91 GT 90 LX 5.0 Join Date: Aug 2009 Location: youngstown, ohio Posts: 1,025 iTrader: 0 reviews	Ya ill definitely be checking that, also, would the best way to find the leak would be to just crawl under the car while its running and look for spraying or dripping gas? I almost dont even wanna mess with it since the car is running fine but i figure it can only get worse. __________________ 1991 GT- All Stock 1990 LX 5.0- CAI, Shorty headers, flowmaster, Tubular Upper and Lower Control arms, Tokico HP series, Eibach Springs

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