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Old 08-16-2016, 12:08 PM #1
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Strong smell of gas - need a 4runner surgeon
Good morning fellow Toy lovers.

If I drive with the back window down, there will be a strong smell of gas and mild motor-ish smell. If the window is up the smell is barely noticeable. Any idea?
I bought the truck 2 months ago and the guy said it was like that for about 2 years now. I have a Thrush exhaust....

Recently a very small 12inch long grey pipe section (similar to the size of a straw) fell from under my car due to rust on both side. It was near the back axle. Could this have anything to do with gas vapor??

Thanks so much
Pat
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Old 08-16-2016, 12:22 PM #2
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Quote:
Originally Posted by Paramedic View Post
Good morning fellow Toy lovers.

If I drive with the back window down, there will be a strong smell of gas and mild motor-ish smell. If the window is up the smell is barely noticeable. Any idea?
I bought the truck 2 months ago and the guy said it was like that for about 2 years now. I have a Thrush exhaust....

Recently a very small 12inch long grey pipe section (similar to the size of a straw) fell from under my car due to rust on both side. It was near the back axle. Could this have anything to do with gas vapor??

Thanks so much
Pat
Sounds like your gas vapor line fell off, it should route up near the gas cap, now that vapor is just releasing under the car.
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Old 08-16-2016, 12:23 PM #3
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Does it occasionally throw P0440, P0441, or P0446 codes?

Is this just on startup or do you smell it all the time?
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Old 08-16-2016, 12:59 PM #4
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Exhaust leak or gas evap?
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Old 08-16-2016, 01:53 PM #5
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I smell it all the time, not just when I start it.
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Old 08-16-2016, 02:03 PM #6
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Crawl under your truck and figure out whats rusting off. If your truck is rusty enough you have pieces falling off, its time for a thorough inspection before something comes apart and causes an accident.
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Old 08-16-2016, 05:13 PM #7
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Quote:
Originally Posted by BoomSticks View Post
Exhaust leak or gas evap?
Yeah, gotta be one or the other.

If it's throwing the codes I posted it's the evap system. Otherwise I'd check for exhaust leaks.
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Old 08-16-2016, 08:10 PM #8
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When the back window is open I have that gas smell, but only when the engine is cold or not at operating temp. It's only when it's running rich on warm up. If I open the window after about 5 mins there is no smell.
It's just the gases being sucked up.
I open the window about 20cm in the summer as it gives a nice draft.

Is this the case with you or does it do it when the engine has warmed up too ?
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Old 07-04-2020, 12:35 PM #9
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Strong gas smell when i pull into the garage and shut down the engine. Fuel system is pressurized. It even makes a weird put put sound from the gas cap. Goes away after about half an hour. Thoughts?
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Old 07-04-2020, 06:17 PM #10
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Quote:
Originally Posted by mechanic80 View Post
Strong gas smell when i pull into the garage and shut down the engine. Fuel system is pressurized. It even makes a weird put put sound from the gas cap. Goes away after about half an hour. Thoughts?
Gas cap seal failing. Evap emmision lines rusted off or damaged

Fuel lines leaking, gas tank rusted on top. Filling tube rusted or damaged.

Evap canister damaged or leaking.

Gas vapor fumes can travel around. So check that rig over really good. Should be pretty easy to find.;)

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Old 07-04-2020, 07:51 PM #11
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What Brillo said. My gas smell turned out to be a rusted and broken evap hardline
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Old 07-05-2020, 02:33 PM #12
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Quote:
Originally Posted by BrianK14 View Post
What Brillo said. My gas smell turned out to be a rusted and broken evap hardline
Extremely common when they rust some..:-(
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Old 07-05-2020, 10:58 PM #13
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Quote:
Originally Posted by brillo_76 View Post
Gas cap seal failing. Evap emmision lines rusted off or damaged

Fuel lines leaking, gas tank rusted on top. Filling tube rusted or damaged.

Evap canister damaged or leaking.

Gas vapor fumes can travel around. So check that rig over really good. Should be pretty easy to find.;)

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New TOYOTA gas cap, remarkably rust free. (still has production stickers on frame/chassis parts!) I'll check the evap for damage. Seems to be coming from the back. I'll start there Thanks
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Old 07-06-2020, 08:22 AM #14
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Quote:
Originally Posted by mechanic80 View Post
New TOYOTA gas cap, remarkably rust free. (still has production stickers on frame/chassis parts!) I'll check the evap for damage. Seems to be coming from the back. I'll start there Thanks
Ok then most likely not rusted off line. Possibly cracked rubber line in the back then. The lines can split and crack in dry environments.

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Old 07-06-2020, 03:06 PM #15
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Can also be the purge valve or gasket on the gas tank. Over the gasket around the purge valve will start to rot/crack, and this will allow for fumes to escape. That was the issue on mine at least.

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