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Offensive gas smell after 10 minutes of driving

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rmcphearson
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Offensive gas smell after 10 minutes of driving

Post #1 by rmcphearson » Sun Jun 23, 2019 7:07 pm

Greetings all,

After about 10 minutes of driving, I get a pretty strong smell of gas-like fumes from my 170 with Autolite 1100. There are no gas leaks. I currently have the PCV valve feeding the vacuum port below the carb and a filter-to-atmosphere-cap on the other end of the rocker cover. At first I thought I may be getting fumes from that filter cap but now I'm pretty certain the smell is coming from the carb, not the pcv system. If I am right, what can I do about it? I believe I tuned the carb to be more lean than rich. I have a Holley that I plan to put on at some point. Might that help?

Thanks,
-Roland

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chad
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Offensive gas smell after 10 minutes of driving

Post #2 by chad » Sun Jun 23, 2019 7:46 pm

there R 'sniffers' a friend or the station can put around there to locate.
Duz the AC housing have the nipple to put the frnt VC hole to w/a hose?
It's not blow by?

Not there B4 this last carb tune? then it must B frm that (C turbo's quote in my sig).

Hydrocarbons' not good 2 breath - get that nxt carb on or put some more time inta dis'un... :evil:
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

Soldmy66
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Re: Offensive gas smell after 10 minutes of driving

Post #3 by Soldmy66 » Sun Jun 23, 2019 9:12 pm

I had what was, to me at least, a really funny sophomoric response to the title -- but then I suddenly remembered that I am no longer in Junior High.

Move along, nothing to see here.

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JackFish
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Re: Offensive gas smell after 10 minutes of driving

Post #4 by JackFish » Sun Jun 23, 2019 11:32 pm

Might need a float level adjustment.
1978 Ford Fairmont station wagon
1978 Ford Fairmont station wagon
Yup, I bought another one.
1996 Chevy Caprice 9C1 (3)
1999 Dodge Ram 2500

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chad
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Offensive gas smell after 10 minutes of driving

Post #5 by chad » Mon Jun 24, 2019 1:03 am

66's talkin bout looser pants
:roll:
:fume:
:oopsie:
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

drag-200stang
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Re: Offensive gas smell after 10 minutes of driving

Post #6 by drag-200stang » Mon Jun 24, 2019 8:41 am

Dead mouse in heater ?
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

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B RON CO
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Re: Offensive gas smell after 10 minutes of driving

Post #7 by B RON CO » Mon Jun 24, 2019 10:36 am

Hi, check your oil to make sure the gas is not going into the crank case.
Good luck
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

rmcphearson
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Re: Offensive gas smell after 10 minutes of driving

Post #8 by rmcphearson » Fri Jun 28, 2019 3:23 pm

chad wrote:Duz the AC housing have the nipple to put the frnt VC hole to w/a hose?
It's not blow by?

The pcv valve is in the front. I do not have a nipple in the AC housing to supply the rear intake port of the rocker cover.

But I think it's gas that I'm smelling. There is no gas in the oil. I don't know if this gas smell was there before the carb rebuild because the whole neighborhood smelled of gas at that time due to the liquid petroleum trail left by my original leaking gas tank. I replaced the tank around the same time as the carb rebuild.

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65coupei6
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Re: Offensive gas smell after 10 minutes of driving

Post #9 by 65coupei6 » Fri Jun 28, 2019 4:08 pm

When you say "gas". Do you actually mean gas the liquid? Or are you smelling exhaust?
If it is gas then I would not drive the car. That is a nice accident waiting to happen.

Diesel does not combust easily. But I would not like to get gas on a hot manifold or headers.
...Marco

'65 Mustang Inline 200. VI (CI) Aluminum Head, Holley 350, Schneider 264/274 cam,
Headers, DSII, MSD 6A, and a whole lotta other stuff!

Build That Six With Parts From VintageInlines.com

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chad
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Offensive gas smell after 10 minutes of driving

Post #10 by chad » Fri Jun 28, 2019 7:23 pm

here's an idea
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"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

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Econoline
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Re: Offensive gas smell after 10 minutes of driving

Post #11 by Econoline » Fri Jun 28, 2019 10:08 pm

If it's a fresh rebuild I'd dbl chk the float level as said. It could be weeping from the bowl gasket. It only takes 1 drop of fuel to drip and evaporate to cause quite a stench. Run you finger or some paper towel around the upper gasket next time run it up to temp after a drive and see if it's wet at all. Don't wait, do it immediately after shut down. The gasket will likely swell and seal off after a while on it's own. You could very carefully re torque the screws but don't get carried away the tops of those 1100's warp really easy.
It ain't gonna fix itself

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bubba22349
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Re: Offensive gas smell after 10 minutes of driving

Post #12 by bubba22349 » Fri Jun 28, 2019 10:45 pm

The to the OP, You didn't mention the year or car model your 170 is in. But here is some other things to check out that can cause a gas smell. A defective fuel cap (vent valve) and then there's is a vent line on the real early models, or a charcoal fuel canister on some later models. Good luck in the hunt. :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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