strong Gas smell after filling new tank

v2addict · Craighurst On Member

strong Gas smell after filling new tank

builderrhys · Welland On, Nice 49 Merc build

Are you using a Fuel Cell (similar to the one pictured below) or a regular OEM Fuel Tank?

1002phr_13_o+1967_plymouth_valiant+trunk.jpg

v2addict · Craighurst On Member

Similar to the one your showing, I built one for under the rear frame rails out of 3/16" aluminum.

Angelo

builderrhys · Welland On, Nice 49 Merc build

I have the same problem with my Fuel Cell. The cap vents to atmosphere (on most) and it also has a vent line which is probably open to atmosphere. I am currently setting up a charcoal filter, well just figuring it out. I don't believe you can by a system over the counter. It will need a canister and an actuated valve to unload the fumes back under vacuum when you fire up. Winter project.................................... Maybe others will chime in with some suggestions on easy setups........................................Rhys

v2addict · Craighurst On Member

builderrhys wrote:
I have the same problem with my Fuel Cell. The cap vents to atmosphere (on most) and it also has a vent line which is probably open to atmosphere. I am currently setting up a charcoal filter, well just figuring it out. I don't believe you can by a system over the counter. It will need a canister and an actuated valve to unload the fumes back under vacuum when you fire up. Winter project.................................... Maybe others will chime in with some suggestions on easy setups........................................Rhys

Thank you for the input, I was following a build on the Ford pickup site and there was a guy installing a charcoal filter, I thought it was a emissions thing, I will dig into it, I may need to empty the tank for storage.

Thanks for your input.

Angelo

Matchless · Vineland On Rod-Side Member

Angelo, depending on what fuel you use you might be better off emptying the entire fuel system prior to storage regardless.

Slim · Hydraulic Service Dundas On

v2addict wrote:

I have a traditional fuel sending unit with a bottom pick up and vent.

Thanks

Angelo

What did you do to the vent ? If your sure the cap is vented plug it off.

v2addict · Craighurst On Member

Matchless wrote:
Angelo, depending on what fuel you use you might be better off emptying the entire fuel system prior to storage regardless.

I always use Hi test because I've been told it will not go bad as fast as regular, also I use Stabil in everything, I was also told that filling the tank was best to reduce the possibility of condensation inside the tank.

I will probably drain it this year as I'm worried it will be a problem, just another glitch to solve next year. I just got it running for the first time this past week.

Thank you

Angelo

v2addict · Craighurst On Member

Slim wrote:
v2addict wrote:

I have a traditional fuel sending unit with a bottom pick up and vent.

Thanks

Angelo
What did you do to the vent ? If your sure the cap is vented plug it off.

Hi Slim, thanks for your intrest in helping me!!

I have one of the marine style caps that will sit flush in the back of my box in the wood planks, I'm fairly certain it has no venting capabilities as I believe there is an o-ring on the inner rim of the cap screw, I'm venting off the tube attached to the fuel sending unit with a 5/16" tube off the frame.

Angelo

v2addict · Craighurst On Member

www.etechglobal.com/v10_images_transparent/spacer.gif

Filler cap

v2addict · Craighurst On Member

www.yogisinc.com/index.cfm

Sorry first link did not work.

Angelo

toomuchjunk · Oct 2, 2016

v2addict wrote:
www.yogisinc.com/index.cfm

Sorry first link did not work.

Angelo

neither did that one unless you were posting the index

-- Edited by toomuchjunk on Sunday 2nd of October 2016 09:48:38 AM

v2addict · Craighurst On Member

try this again! prd_zm_5192[1].jpg

Chevy Dan · member

With this being a brand new tank, make sure you aren't seeping gas from one of the seams of the tank or somewhere at a fuel line joint.

My old car used to smell a gassy when parked in the garage (with original tank and vented cap). I changed to a non-vented neck and cap, then added a vent line from the tank to the engine bay, ran it into a GM charcoal filter (mounted in the engine bay) taken from a truck in the scrapyard, didn't hook up the purge valve as I just wanted the fumes to run through the charcoal at all times, then ran a line from the charcoal filter to the carb. Completely removed any trace of gas smell.

-- Edited by Chevy Dan on Sunday 2nd of October 2016 10:12:08 AM

v2addict · Craighurst On Member

Thanks for that info Chevy Dan, I welded and tested the tank, no leaks, that was what I was thinking about was some type of charcoal filter, I will need to resurch the installation, I think I will get to it first thing next spring.

Angelo

fatstax · Cobourg On member

if it has vent line then run a hose from it to the outside of the vehicle, if you smell gas after a fillup its because some fuel got in the vent line, there should be a check valve that allows air to into the tank but not escape, thus you get the smell.

v2addict · Craighurst On Member

Thanks for the reply Fatstax, so its possible there is too little fuel in the tank to close the check valve, I think I may have put in as little as a gallon of hi test as it was my first time starting the truck up! or possibly due to sitting inactive for 2 years the check valve in the vent tube has seized or stuck?

Angelo

Chevy Dan · member

I am not understanding this check valve stuff. I've heard of them for protection in the event of a rollover but how does it work in a vent line? (car is upside down, ball drops and prevents fuel from leaving the tank).

I don't see how the rollover style would help your situation. Are there other styles out there strictly for venting purposes?

v2addict · Craighurst On Member

Chevy Dan wrote:
I am not understanding this check valve stuff. I've heard of them for protection in the event of a rollover but how does it work in a vent line? (car is upside down, ball drops and prevents fuel from leaving the tank).

I don't see how the rollover style would help your situation. Are there other styles out there strictly for venting purposes?

Hi Dan, I'm not saying there is a problem with a check valve, I actually know very little about the subject which is why I was reaching out, LOL

v2addict · Craighurst On Member

I have been working on the truck all week as I need to put it into storage next week until we get our new home. I was on a mission to get this truck as far as I could and I have achieved all of that and more HOHA!!
3 years and 11 months to go from a shell and no frame to a running truck with little experience with cars, thanks to the internet and you guys this is possible with common sense and little experience.

I'm not much of an internet socializer I mostly read and ask lots of dumb questions so I can learn, and I truly thank all the people that gladly answer with patience, and I will add that Chuck has done an amazing job so far in keeping this site very up beat and civilized for us green horns.

I thank you all.

Back to the venting, its hard to tell if it has gotten better over the week, interesting fact, I found that when bolting in my tank I had pinched the vent line between the frame rail and the tank, I could not tell weather it was fully blocked but I'm wondering if that had caused the tank to have little to no vent and possible had built up pressure and vented through the gas cap filler ( which is not vented) but possibly over pressurization has caused leak by the cap?

Not sure but I will need to keep my eye on it, in the end I believe I will install some kind of a charcoal filter to try and remedy that issue.

I will get some current pictures and post them on the projects section before she goes into hibernation!

Thank you again guys, I hope to get out in her next summer and perhaps come meet you all at some events.

Angelo

V2Addict

Chevy Dan · member

Pinching off the vent tube will do two things that I can think of. One would be that a vacuum is created inside the tank as fuel is removed (by the running engine) due to air not being allowed into the tank to fill the void left by the missing fuel. The other is that pressure can build in the system/tank (just sitting, engine not running) similar to what happens to a sealed plastic gas can that is not vented. Heat it up in the sun and the plastic container will balloon.

If your system is building pressure, I'd guess that the gas cap isn't the weakest link. Too much pressure could easily blow fuel past a carbs needle valve (for example). I don't know what pressure would do to a fuel injection system though.

You should also make sure that the venting system is setup so that fuel can't slosh out the vent tube and coat the underside of the truck. I'd expect that could easily make a bit of a stink.

-- Edited by Chevy Dan on Thursday 6th of October 2016 07:35:59 PM

v2addict · Craighurst On Member

Thanks Dan, I will go over everything next spring for sure, as its almost ready for the road.

Angelo

red-oak · St.Marys Ont -Rod Side Member

your tittle made me laff one day at work after filling up a truck with gas, I walked into a room my boss says you smell like gas I said to him you sound like my wife he says different gas

v2addict · Craighurst On Member

your right that's a funny title!

I had to go back and re read it and I was not thinking about anything else but what I needed an answer for, looking at it now its funny.