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#1 |
Senior Member
![]() Join Date: Jul 2008
Location: Central Coast, CA
Posts: 266
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Garage gas fumes
Was very excited to recently find garage space for my truck. Was very unexcited to find out shortly afterwards that the garage now is full of gasoline fumes. Near as I can tell, likely coming from the tank through the vented cap. I was hoping to have the garage as an enclosed work space for the truck, but not really possible due to the fumes. Better with the garage door open, but not so great with the current cold and rainy weather. Anyone else with this issue, and more importantly, good ideas on how to solve it?
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#2 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,256
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Re: Garage gas fumes
Very unlikely its from the venting cap. Epically this time of year.
I would look elsewhere. |
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#3 |
Beep! Beep!
![]() Join Date: Nov 2003
Location: Rural, MO
Posts: 280
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Re: Garage gas fumes
Years ago, mine stank up from a cracked seal on the gas cap (not oem or oem style). Now it's from overfilling it.
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1972 Chevrolet C/10 shortbed, stepside, 350, HEI, Fire Engine Red, Black Interior, Former Army cargo transport 2003 Chevrolet 2500HD CC 6.0 4wd 2004 Jeep Rubicon some aftermarket stuff... 2019 Jeep Unlimited Rubicon (the wife's baby hauler) |
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#4 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,941
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Re: Garage gas fumes
Check all the rubber lines under the truck. There will be a short rubber fuel line from the tank to the hard line mounted on the frame, and then another from the hard line on the frame to the fuel pump. They get hard and brittle over time. Also check to see if the carb is leaking fuel at the throttle shafts, or from the fuel line inlet. What engine and carb do you have?
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#5 | |
Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 342
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Re: Garage gas fumes
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#6 |
Senior Member
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Location: Podunk, Texas
Posts: 748
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Re: Garage gas fumes
My garage has fumes were traced to a worn out fuel pump….
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"It is hard to search for a black cat in a dark room, particularly if it is not there. Especially if this cat is smart, brave, and polite." Sergei Shoigu, Russian Minister of Defense |
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#7 |
Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 342
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Re: Garage gas fumes
Good call. Had an Oreilly fuel pump with about 10 miles on it. Truck parked in garage for several weeks. Went out to the garage one night and smell a strong gas odor. The fuel pump was dripping from the cap where the pump was pressed onto the body. Like I said truck hadn't been driven in some time. Bought a better fuel pump. It's always something. Discovered a leaking wheel cylinder today. Crap.
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#8 | |
Active Member
![]() Join Date: Feb 2009
Location: Ben Wheeler, TX
Posts: 108
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Re: Garage gas fumes
Quote:
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72 Sierra Grande 2500 BB 72 Sierra 2500, 42K miles, factory buckets 72 Cheyenne 20 72 Chevy SWB, Factory BB, Leaf Spring |
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#9 |
Senior Member
![]() Join Date: Jul 2008
Location: Central Coast, CA
Posts: 266
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Re: Garage gas fumes
Yes, I should have clarified, this is for my '67 Suburban. That B-pillar hose appears intact but original, so probably a good idea to replace it. No drips on the paper overnight after a drive and I don't smell any gas along the frame rails. The garage didn't smell too badly of gas this morning with overnight temps in the low 40's. The gas cap gasket is pretty badly cracked, so will replace the cap after it comes off back order. The venting info is interesting and very helpful; I'm going to do the simple stuff first and see how it goes and will look into venting the tank if needed. Would a new sender have a vent tube for this; would it need to be for a later model Suburban?
Thank you again for all the helpful responses. |
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#10 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,157
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Re: Garage gas fumes
I don't know if you can get a factory sender with the vent tube in it. I believe (but not positive) the later tanks had the vent in the tank not the sender.
I modified mine by drilled a hole in it and soldering a tube in. See the 2nd post down in the link. http://67-72chevytrucks.com/vboard/s...698377&page=16 The PO of my truck couldn't get the engine to run with a no fuel situation. He replaced the fuel pump but it still wouldn't pick up fuel. He dropped the tank and replaced the sock still no fuel so he plumbed an electric fuel pump in by the fuel tank. He said when he turned the fuel pump on that little hose looked like a sprinkler in the yard. Fuel was spraying every where. The hose didn't leak with out pressure but sucked enough air to keep the mechanical fuel pump from pumping fuel to the carb. . Having heard that story I always recommend replacing that hose.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#11 |
Senior Member
![]() Join Date: Feb 2022
Location: Ca
Posts: 517
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Re: Garage gas fumes
We, this could be a good thing. First, if the garage has any home appliances of any type, park truck outside until fixed. A pilot light or ignition spark can ignite gas vapors with really bad results. Even a light switch can light off vapors so be careful. It does not take much gas to stink up a garage. Look for signs of damp areas. May not be puddles. Also if it's a carb, hot engine will evap the drips and may not be easily seen. Good luck with the search. Mine was a hard hose at the pump to return line.
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#12 |
Registered User
Join Date: Dec 2001
Location: harvard, il. USA
Posts: 389
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Re: Garage gas fumes
Put a piece (or pieces) of cardboard, red rosin paper, under your truck to find leaks.
HTH...Don. |
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#13 |
Senior Member
![]() Join Date: May 2007
Location: new jersey
Posts: 608
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Re: Garage gas fumes
for me, it was a leaking fuel pump. Never had issues with gas caps.
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#14 | |
Senior Member
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Location: Scottsdale, AZ
Posts: 1,906
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Re: Garage gas fumes
Quote:
What happened and why this fixed it. New gasoline blends have a low boiling point sometimes as low as 100 degrees. After the engine is shut off, it continues to heat up (no water or air flowing). Gas boils in carb, lines and pump. This floods the carb… and you smell gas. Plus, you have a hard start after engine sits about 15 minutes after a run. Recirculating line routs the boiling gas back to the tank. I did a recirculating setup with vapor separating filter. I don’t smell gas in my garage anymore, but I do still get an occasional hard start. I just slightly feather the pedal if the engine is warm and no problems. Or you can move to an electric fuel pump in tank that requires a recirculating line. Or move to fuel injection. That is if heat soak is your problem. Good Luck! ![]() j
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#15 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,508
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Re: Garage gas fumes
I get a gas smell when the we have these wide swings in temperature 40s-50s during the day and teens at night . My garages are not heated so it can swing by 20 degrees or more between night and day . It happens with every vehicle that vented to atmosphere. My Chevelle does it as the vent tube runs up into the trunk and then back down to outside under the car . As the tank cools at night it sucks in air and as it warms it expands and vents . When the temps are stable at real cold or warm the smell is gone .
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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#16 |
Senior Member
![]() Join Date: Jul 2008
Location: Central Coast, CA
Posts: 266
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Re: Garage gas fumes
Wow, great responses and ideas, thank you! The engine is a 292 with a period-correct Rochester 4G (4-jet) adapted to it (for a too-long explanation of why this carb, see this thread: http://67-72chevytrucks.com/vboard/s...d.php?t=844048).
Pretty sure there's no leak at the carb end - there was after my initial carb rebuild, so I've been on top of it checking for leaks and it looks pretty well sealed up. The carb does vent the bowl to the atmosphere, but the gas smell can be so strong for so long, I'm thinking this isn't the problem (though it was one of the reasons I had a 2-bbl prior to this carb - I was able to vent the bowl to a carb canister). I believe the fuel pump is ok, but I'll take a closer look at it over the next few days. How does one set up a recirculating fuel line with the filter and vapor separator? This is new to me - thought this was just for electric pumps/fuel injection. I'll put some rosin paper under the truck after its next drive - curious as to what it may show. I'll take a look at the rubber lines under the truck - almost positive they're original; probably a good idea to replace them regardless. I'll also double check the seal on the gas cap. Light switch would be the only spark concern in the garage - I keep a window open to minimize the chance of too much vapor build up with a resulting unexpected surprise. |
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#17 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,157
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Re: Garage gas fumes
Is this on a Carry All? If so there is a short piece of fuel hose in the fuel line on the passenger side about where the B- pillar is.
Here are links for more information on EEC the fuel vapor system. If is is for a 67 Burban then you will have to add a vent tube in the tank. I put one in my sender as part of my plan to switch to a non-vented cap. The Burbans (And also Blazers I believe) have a different vent loop set up than the pickups do. Pickup vents in first photo. https://67-72chevytrucks.com/vboard/...d.php?t=601940 https://www.67-72chevytrucks.com/vbo...d.php?t=842591 Suburban tank vent tube. http://67-72chevytrucks.com/vboard/s...d.php?t=699716 And more information on Burban venting. https://www.67-72chevytrucks.com/vbo...d.php?t=687417
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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