I smell fuel
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Elder User
Joined: Apr 2002
Posts: 692
Likes: 3
From: Gatesville, TX
I smell fuel
When my truck is parked in the closed up garage overnight, I smell gasoline when I open the garage door in the morning. My gas tank vent is just a hose, run up higher than the tank. It is open ended. I stuck a bolt in the end of it and I did not small gas the next day.
The tank is mounted under the bed at the rear.
What should I use on the end of it to eliminate the fumes?
The tank is mounted under the bed at the rear.
What should I use on the end of it to eliminate the fumes?
Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
Howdy!
Do you have a vented gas cap on that tank? You need to!!!! This time of year when it is still pleasent during the day but getting COLD at night, the gas in your tank is going to expand and contract quite a bit with the temperature variation. And that means the tank is going to breath in and out.
Also, don't discount the fact that you may have a fuel leak somewhere else in the system - maybe even just a sweat.
Check you filler neck hoses for seal - big culprits. Also, check your sending unit gasket for seal. Then check all your flex hoses.
If you have a fuel pump glass bowl filter check that seal. And, check for a tight connection at the carb. Lastly, check the carb float bowl gasket for seal.
If that doesn't work, don't breath through your nose when you go into the garage - fix it for sure
And no smoking please
Good luck,
Julie
Do you have a vented gas cap on that tank? You need to!!!! This time of year when it is still pleasent during the day but getting COLD at night, the gas in your tank is going to expand and contract quite a bit with the temperature variation. And that means the tank is going to breath in and out.
Also, don't discount the fact that you may have a fuel leak somewhere else in the system - maybe even just a sweat.
Check you filler neck hoses for seal - big culprits. Also, check your sending unit gasket for seal. Then check all your flex hoses.
If you have a fuel pump glass bowl filter check that seal. And, check for a tight connection at the carb. Lastly, check the carb float bowl gasket for seal.
If that doesn't work, don't breath through your nose when you go into the garage - fix it for sure
And no smoking please
Good luck,
Julie
Thread Starter
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Elder User
Joined: Apr 2002
Posts: 692
Likes: 3
From: Gatesville, TX
Howdy!
Do you have a vented gas cap on that tank? You need to!!!! This time of year when it is still pleasent during the day but getting COLD at night, the gas in your tank is going to expand and contract quite a bit with the temperature variation. And that means the tank is going to breath in and out.
Also, don't discount the fact that you may have a fuel leak somewhere else in the system - maybe even just a sweat.
Check you filler neck hoses for seal - big culprits. Don't have a filler neck hose Also, check your sending unit gasket for seal. Did that Then check all your flex hoses. Did that. Only have the suction hose to fuel pump
If you have a fuel pump glass bowl filter check that seal.Don't have one And, check for a tight connection at the carb.Did that. Lastly, check the carb float bowl gasket for seal.did that. Not likely since I have an Edelbrock carb and the gasket is above the fuel level.
When I put a plug in the end of the vent hose, I did not smell gas when I went in the garage, so I think that pretty much rules out leaks.
If that doesn't work, don't breath through your nose when you go into the garage - fix it for sure
And no smoking please
Good luck,
Julie
Do you have a vented gas cap on that tank? You need to!!!! This time of year when it is still pleasent during the day but getting COLD at night, the gas in your tank is going to expand and contract quite a bit with the temperature variation. And that means the tank is going to breath in and out.
Also, don't discount the fact that you may have a fuel leak somewhere else in the system - maybe even just a sweat.
Check you filler neck hoses for seal - big culprits. Don't have a filler neck hose Also, check your sending unit gasket for seal. Did that Then check all your flex hoses. Did that. Only have the suction hose to fuel pump
If you have a fuel pump glass bowl filter check that seal.Don't have one And, check for a tight connection at the carb.Did that. Lastly, check the carb float bowl gasket for seal.did that. Not likely since I have an Edelbrock carb and the gasket is above the fuel level.
When I put a plug in the end of the vent hose, I did not smell gas when I went in the garage, so I think that pretty much rules out leaks.
If that doesn't work, don't breath through your nose when you go into the garage - fix it for sure
And no smoking please
Good luck,
Julie
Thanks for the thoughts! Got any more?
Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
Hi Don,
No filler neck hoses? Is it just a rigid metal tube all the way to the tank - just curious.
Well it sound to me like you've checked out all the regulars and when you plug the vent hose it stops. I was just thinking of alternatives. BUT, if it looks like a duck........
I guess I would venture to say your tank is just breathing through the vent hose.
I'd be willing to bet they make some type of filter or check valve that you can use to keep those fumes in the tank - something that allows it to suck in air to replace used fuel but doesn't allow vapor out. Not familiar with any. Is you vent tube higher than your carburetor? May be getting a little back flow when not running and it's pushing gaseous air out the vent.
J!
No filler neck hoses? Is it just a rigid metal tube all the way to the tank - just curious.
Well it sound to me like you've checked out all the regulars and when you plug the vent hose it stops. I was just thinking of alternatives. BUT, if it looks like a duck........
I guess I would venture to say your tank is just breathing through the vent hose.
I'd be willing to bet they make some type of filter or check valve that you can use to keep those fumes in the tank - something that allows it to suck in air to replace used fuel but doesn't allow vapor out. Not familiar with any. Is you vent tube higher than your carburetor? May be getting a little back flow when not running and it's pushing gaseous air out the vent.
J!
Fleet Mechanic
Joined: Apr 2008
Posts: 1,373
Likes: 6
From: Moore (or less), OK.
They do make vent units that allow air into the tank but not out that you could put on the end of the hose.
My old 87 Harley has a vented cap that does that and sometimes you can hear the pressure escape when I open the cap to check the fuel level after it has sat for an hour or so after running.
I am betting that would solve you fuel smell problem.
My old 87 Harley has a vented cap that does that and sometimes you can hear the pressure escape when I open the cap to check the fuel level after it has sat for an hour or so after running.
I am betting that would solve you fuel smell problem.
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Elder User
Joined: Apr 2002
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From: Gatesville, TX
There are no openings in the bottom of the tank. The filler neck is about 3" long and the cap is right under the bed floor. Have trap door in floor of bed to fill it. All openings are on the top of the tank. The vent fitting is in back drivers side corner.
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Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
Oh yeah...if it's that short hose coming out of the upper right hand fitting in your picture I would say you are most probably getting some fumes out of it. You have a lot of surface area in that tank and if you get any kind of expansion (remember when it gets cold the tank shrinks first and pushes air out) you will have fumes. If you think about the amount of surface area in th etank as opposed to the small surface area of the opening of the vent hose you can see how much flow from it youwould get - much the same as the principle of hydraulic advantage.
I'd try the directional flow valve on it to let air in but not out that BACAGrizz described.
Very nice and clean set up BTW!
J!
I'd try the directional flow valve on it to let air in but not out that BACAGrizz described.
Very nice and clean set up BTW!
J!
Posting Guru
Joined: Mar 2008
Posts: 1,272
Likes: 3
yeah, no doubt, that line is too short and, (IMHO), should be elevated so no fuel will get in line when truck is used. and yes, one way valve will eliminate fumes.----------i originally thought you had stock tank---didn't do my homework! ps--that vent hose should be higher than filler in your application. (IMHO)
Last edited by petey shoes; Oct 27, 2008 at 04:41 PM. Reason: add-on
Posting Guru
Joined: Mar 2003
Posts: 1,734
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From: Kansas City area
Don- just another opinion following up on what petey shoes suggested......I would loop that vent hose up and then back down (like an upside down "U") so nothing is able to get in the vent line while driving. The way it is it appears dirt and water could possibly enter your tank when driving down the highway at 80.
Thread Starter
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Elder User
Joined: Apr 2002
Posts: 692
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From: Gatesville, TX
That picture of the tank was taken during the construction phase. After the bed was mounted, the vent hose is about 3 ft long and is looped up and down. I am not sure if the end is above the top of the filler neck though. I will look for a one way valve and try that. Thanks for everyone's thoughts.
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