Fuel smell - The 1947 - Present Chevrolet & GMC Truck Message Board Network

upon1 · 01-07-2021, 11:45 AM

I’ve got a 5.3 in my ‘55 and am getting a strong fuel smell when parked in the garage. No leaks anywhere, triple checked everything. I have an rci fuel cell with a k&n type breather on it and tuning a return style system with braided nylon hose front to back. Has anyone had this issue with this type of fuel hose?

ls1nova71 · 01-07-2021, 11:55 AM

I have heard of a lot of people saying they get gas smell with regular braided line. I believe you need to use PTFE line to avoid it.

87chevy.com · 01-07-2021, 11:26 PM

The filter on the tank is just keeping dust out

If you have a k&n filter on a gas can will.it emit fuel smell.. yeah, fuel pfte might be great, but wont fix your problems.. prob need to run a vent line like to engine bay so vapors can condense and return to tank.

I have an 87 r10, l83 swap, used stock vapor line to engine bay for vent/roll over valve and is left open. Zero fuel smell using aeroquip e85 rubber fuel safe hose and aluminium line elsewhere. Truck sits in garage for for weeks at a time :/

Clint

LS short box · 01-08-2021, 05:36 PM

I would be willing to bet the gas smell is from the tank vent. Easy to check. Just take the vent filter off and plug the vent. And let it sit overnight? if you aren't going to drive it. If you don't have any smell you found the source of the smell.

**1971Stepside** · 01-12-2021, 04:56 PM

I read a lot of guys were getting the gas smell running the braided line. I ended up running braided from the rail to the frame and then ran a solid line to the back of the truck and used braided to hook to tank. I have a vent on my tank with no smell.

87chevy.com · 01-18-2021, 12:28 AM

Quote:

Originally Posted by LS short box

I would be willing to bet the gas smell is from the tank vent. Easy to check. Just take the vent filter off and plug the vent. And let it sit overnight? if you aren't going to drive it. If you don't have any smell you found the source of the smell.

Just dont run the truck with the vent plugged or you will suck the tank, sounds stulid, but just happened to a coworker on his chevelle build.

**LEEVON** · 01-24-2021, 06:42 PM

I doubt it's the hose, fuel vapor needs somewhere to go. My '53 with a 5.3L had the same problem and my wife absolutely beat me up over it. Pre-emissions vehicles had charcoal canisters that contained the fuel vapor and they always had a long run of fuel line to get there and back. Remember fuel vapor is heavier than air, so when it "burps" its just sending into your garage and dispersing on the floor right now. My solution was to create a vent line, which runs from the filler neck, to a high loop in the cab corner (stock tank), then down through the floor and to the back of the frame. At the end I put a regular old inline clear plastic/paper fuel filter. That was enough volume to contain the vapor when the garage heats up, or when I come back from a drive, etc. NO MORE SMELL AT ALL. In your case you could run a vent line from the tank, or plug that and do I like I did.

01-07-2021, 11:45 AM	#1
upon1 Registered User Join Date: Oct 2007 Location: Saskatoon Posts: 138	Fuel smell I’ve got a 5.3 in my ‘55 and am getting a strong fuel smell when parked in the garage. No leaks anywhere, triple checked everything. I have an rci fuel cell with a k&n type breather on it and tuning a return style system with braided nylon hose front to back. Has anyone had this issue with this type of fuel hose? Attached Images __________________ "Lifes to short to drive an ugly truck." Project 55 To Life http://67-72chevytrucks.com/vboard/s...d.php?t=432994

01-07-2021, 11:55 AM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,117	Re: Fuel smell I have heard of a lot of people saying they get gas smell with regular braided line. I believe you need to use PTFE line to avoid it. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

01-07-2021, 11:26 PM	#3
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,255	Re: Fuel smell The filter on the tank is just keeping dust out If you have a k&n filter on a gas can will.it emit fuel smell.. yeah, fuel pfte might be great, but wont fix your problems.. prob need to run a vent line like to engine bay so vapors can condense and return to tank. I have an 87 r10, l83 swap, used stock vapor line to engine bay for vent/roll over valve and is left open. Zero fuel smell using aeroquip e85 rubber fuel safe hose and aluminium line elsewhere. Truck sits in garage for for weeks at a time :/ Clint __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress

01-08-2021, 05:36 PM	#4
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,917	Re: Fuel smell I would be willing to bet the gas smell is from the tank vent. Easy to check. Just take the vent filter off and plug the vent. And let it sit overnight? if you aren't going to drive it. If you don't have any smell you found the source of the smell.

01-12-2021, 04:56 PM	#5
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Fuel smell I read a lot of guys were getting the gas smell running the braided line. I ended up running braided from the rail to the frame and then ran a solid line to the back of the truck and used braided to hook to tank. I have a vent on my tank with no smell. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-24-2021, 06:42 PM	#7
LEEVON Registered User Join Date: Jul 2006 Location: Ozark, MO Posts: 4,887	Re: Fuel smell I doubt it's the hose, fuel vapor needs somewhere to go. My '53 with a 5.3L had the same problem and my wife absolutely beat me up over it. Pre-emissions vehicles had charcoal canisters that contained the fuel vapor and they always had a long run of fuel line to get there and back. Remember fuel vapor is heavier than air, so when it "burps" its just sending into your garage and dispersing on the floor right now. My solution was to create a vent line, which runs from the filler neck, to a high loop in the cab corner (stock tank), then down through the floor and to the back of the frame. At the end I put a regular old inline clear plastic/paper fuel filter. That was enough volume to contain the vapor when the garage heats up, or when I come back from a drive, etc. NO MORE SMELL AT ALL. In your case you could run a vent line from the tank, or plug that and do I like I did. __________________ '20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids

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