| Author |
Message |
asesapie
Samba Member
Joined: March 07, 2005
Posts: 756
Location: Spokane, WA
|
 Posted: Tue Jun 21, 2011 10:02 pm Post subject: my carb was making a bubbly sound and it stunk like gas |
 |
|
Well I drove about 15 miles and it was anywhere from 60mph to 30 mph speeds. When I got to my destination I parked went inside for about 15-20 min and came back out and I smelled gas about 8 feet from the bus and could hear a bubbling sound coming from the motor area. I opened the engine lid and the bubbling sound was coming from the carb. The carb pulled all the fuel from the fuel filter between the carb and pump. I was thinking could it be that it was sooo hot that it was boiling the fuel out of the carb bowl? I put my hand on the carb to feel how hot it was and it wasn't bad at all, so I don't think that was it. Next I'm thinking is it that I have too much fuel pressure? Or is it that my gas cap is being stupid even though its a vented gas cap that I bought from napa last year to replace my OG gas cap that lost its seal and started to leak.
So what do ya think? |
|
| Back to top |
|
 |
Culito
11010101
Joined: December 07, 2006
Posts: 5882
Location: Columbia Missourah
|
| Posted: Tue Jun 21, 2011 10:26 pm Post subject: |
|
|
Could be either of those. See if you can get it to do it again, and slowly remove the gas cap. Hear anything?
_________________
© CJ Industries, Inc.
'64 standard w/2.0L type 4
'62 bug
| johnnypan wrote: |
| ...dont pay no attention to Culito,he's a cornhole.. |
|
|
| Back to top |
|
|
asesapie
Samba Member
Joined: March 07, 2005
Posts: 756
Location: Spokane, WA
|
| Posted: Tue Jun 21, 2011 11:12 pm Post subject: |
|
|
| Ok I'll give it a shot. So my gas cap says its "vented" I don't trust that it is, how do you tell if it is or how do you vent a gas cap? |
|
| Back to top |
|
|
Campy
Samba Member
Joined: January 10, 2005
Posts: 4933
Location: Chico, CA
|
| Posted: Wed Jun 22, 2011 12:31 am Post subject: |
|
|
When the engine is hot, remove the the cap on the fuel tank and listen for the sound of air going in the tank or fuel vapor going out of the tank, Caution: don't drill a hole in the cap. Get a proper vented cap if you have to.
Check the engine oil to see if there is gasoline in it.
_________________
Don't worry; be happy. (Baba) |
|
| Back to top |
|
|
asesapie
Samba Member
Joined: March 07, 2005
Posts: 756
Location: Spokane, WA
|
| Posted: Wed Jun 22, 2011 7:18 am Post subject: |
|
|
| Well I've heard a woosh of air before when I open the cap after driving it for a bit but my cap says it's vented? So if I go buy a new cap how do I make air it's vented so I'm not wasting my money. |
|
| Back to top |
|
|
RPGreg2600
Samba Member
Joined: November 07, 2010
Posts: 1657
Location: Vallejo, CA
|
| Posted: Wed Jun 22, 2011 7:36 am Post subject: |
|
|
| I've heard that you can drill a tiny hole in the cap. I've never had problems with a cap not venting so have not tried it. |
|
| Back to top |
|
|
Campy
Samba Member
Joined: January 10, 2005
Posts: 4933
Location: Chico, CA
|
| Posted: Wed Jun 22, 2011 10:58 am Post subject: |
|
|
Years ago, there were some new caps being sold as vented that were not venting. I had to return one and get a used one.
Drilling a hole in a cap can be dangerous due to the possibility of fumes being ignited by something like a pilot light and causing the fuel tank to explode. I wouldn't do it. It would be a little like not having a cap on the fuel tank.
_________________
Don't worry; be happy. (Baba) |
|
| Back to top |
|
|
asesapie
Samba Member
Joined: March 07, 2005
Posts: 756
Location: Spokane, WA
|
| Posted: Wed Jun 22, 2011 11:20 am Post subject: |
|
|
| well I drove it about 16 miles got it warm took the cap off and sure enough woosh! a lot of air went in there. stupid crappy gas cap. I don't know where I should get one that I can trust to be vented |
|
| Back to top |
|
|
Campy
Samba Member
Joined: January 10, 2005
Posts: 4933
Location: Chico, CA
|
| Posted: Wed Jun 22, 2011 11:29 am Post subject: |
|
|
Remember to see if gas is in the motor oil. If it is, drain it out in a safe place. Don't run the engine!
_________________
Don't worry; be happy. (Baba) |
|
| Back to top |
|
|
asesapie
Samba Member
Joined: March 07, 2005
Posts: 756
Location: Spokane, WA
|
| Posted: Wed Jun 22, 2011 3:03 pm Post subject: |
|
|
| I checked the oil and it looks normal and smell like oil, doesn't have a smell of gas in the oil. It would be a funky color if it did right? |
|
| Back to top |
|
|
candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2717
Location: Missoula MT
|
| Posted: Wed Jun 22, 2011 4:20 pm Post subject: |
|
|
| Campy wrote: |
Years ago, there were some new caps being sold as vented that were not venting. I had to return one and get a used one.
Drilling a hole in a cap can be dangerous due to the possibility of fumes being ignited by something like a pilot light and causing the fuel tank to explode. I wouldn't do it. It would be a little like not having a cap on the fuel tank. |
This advice i dont understand (fwiw i would never drill a hole in a gas cap). A vented cap vents fumes right out the cap, same if you drilled a hole in a nonvented cap. So how would the fumes coming out of a drilled hole be any more volatile then the fumes coming out a vented cap? Gas fumes are gas fumes and are dangerous if they get near a source of ignition for sure, not doubting that. I am just having a hard time understanding how drilling a hole in a gas cap to allow the fumes to vent (and probably gas as well if you park on an angle with a full tank) is any more dangerous then the fumes that are being venting through a properly vented cap, same fumessme area of venting. Anyways, get a vented cap and see if that cures your problem. If not do a search on "gas bubbling" or something like that. There are threads out there with these questions, i know because i have had these issues even with a properly vented cap. Do a search, you will even find those same warnings about not drilling due to fumes gettin out and exploding  |
|
| Back to top |
|
|
Culito
11010101
Joined: December 07, 2006
Posts: 5882
Location: Columbia Missourah
|
| Posted: Wed Jun 22, 2011 6:01 pm Post subject: |
|
|
Someone punched a small hole in my original VW fuel cap that came with my SC. Not sure why, but it hasn't exploded yet.
(Not saying it won't.)
It could be that the small venting passage in your cap is plugged, and a good soak in some carb cleaner or solvent + compressed air might fix it.
_________________
© CJ Industries, Inc.
'64 standard w/2.0L type 4
'62 bug
| johnnypan wrote: |
| ...dont pay no attention to Culito,he's a cornhole.. |
|
|
| Back to top |
|
|
asesapie
Samba Member
Joined: March 07, 2005
Posts: 756
Location: Spokane, WA
|
| Posted: Wed Jun 22, 2011 7:22 pm Post subject: |
|
|
| Well I found my og cap and got another cap similar to the og one from a local shop it just doesn't have a seal in it. So I'm taking the seal out of the napa cap that doesn't vent and I'm going to put in the new cap and give it a shot and if it doesn't work then I'm going to use the og one. |
|
| Back to top |
|
|
otis_bartleh
Samba Member
Joined: August 19, 2009
Posts: 1151
Location: Burlington, WA
|
| Posted: Tue Jul 19, 2011 9:34 am Post subject: |
|
|
| asesapie wrote: |
| Well I found my og cap and got another cap similar to the og one from a local shop it just doesn't have a seal in it. So I'm taking the seal out of the napa cap that doesn't vent and I'm going to put in the new cap and give it a shot and if it doesn't work then I'm going to use the og one. |
I'm thinking my "vented cap" isn't venting either (got it late last year), having some issues I wasn't having before, but the weather is hotter now. I just filled up this morning, so gonna swap my new seal to my old cap and hope that helps.
Update on your situation?
_________________
-Adam
'59 Mango Bus
'69 Bug - Cobalt Blue |
|
| Back to top |
|
|
asesapie
Samba Member
Joined: March 07, 2005
Posts: 756
Location: Spokane, WA
|
| Posted: Tue Jul 19, 2011 10:41 am Post subject: |
|
|
| Well an update on my situation is good. Ever since I put the new seal in the old style cap it has worked great my gas cap seems to vent now. I don't really trust napa caps anymore |
|
| Back to top |
|
|
otis_bartleh
Samba Member
Joined: August 19, 2009
Posts: 1151
Location: Burlington, WA
|
| Posted: Tue Jul 19, 2011 10:53 am Post subject: |
|
|
| asesapie wrote: |
| Well an update on my situation is good. Ever since I put the new seal in the old style cap it has worked great my gas cap seems to vent now. I don't really trust napa caps anymore |
Cool, thanks. I'll be doing that at lunch today, hopefully I'll have positive results as well....
_________________
-Adam
'59 Mango Bus
'69 Bug - Cobalt Blue |
|
| Back to top |
|
|
asesapie
Samba Member
Joined: March 07, 2005
Posts: 756
Location: Spokane, WA
|
| Posted: Wed Jul 20, 2011 11:42 pm Post subject: |
|
|
| Well I filled my bus up all the way today for the first time and it appears that the seal from the napa gas cap isnt as thick as the of one so the cap leaks if parked at an angle with a full tank. So my question is, what material can be used to make a gasket for inside the gas cap?? |
|
| Back to top |
|
|
crukab
Samba Chef
Joined: December 13, 2002
Posts: 6131
Location: Vermont
|
| Posted: Thu Jul 21, 2011 3:50 am Post subject: |
|
|
They used to sell sheets of cork type stuff, you could cut one out to fit your cap.
_________________
Tom
My Pops:
http://www.thesamba.com/vw/forum/viewtopic.php?t=604100&highlight=
I know you will always be with me, rest in peace with no more pain. 8/13/14.....
In the yard right now:
'51 Dodge 5 window truck
'65 Bug
'66 Singlecab
'82 Rabbit Truck Diesel from CALI 
'86 Doublecab W/T
'91 Vanagon carat/wolfsbrg.Tiico
'88 Dodge Ram pickup
'11 Jetta Wagon |
|
| Back to top |
|
|
Snoop Bob
Samba Member
Joined: May 06, 2003
Posts: 2687
Location: Florida
|
| Posted: Thu Jul 21, 2011 7:50 pm Post subject: |
|
|
You can get sheets of cork gasket material of varying thicknesses at a few places. Probably NAPA, but I picked some up at the local ACE hardware store.
_________________
| BarryL wrote: |
| Put your lips onto the little tit with the hole in it inside and make a good seal. You can suck and blow but with a little resistance. It gets better after it's wet. |
| EverettB wrote: |
| I would be interested in knowing the sizes of the various shafts. |
|
|
| Back to top |
|
|
candyman
Samba Trout Slayer
Joined: December 20, 2003
Posts: 2717
Location: Missoula MT
|
| Posted: Thu Jul 21, 2011 8:05 pm Post subject: |
|
|
| asesapie wrote: |
| Well I filled my bus up all the way today for the first time and it appears that the seal from the napa gas cap isnt as thick as the of one so the cap leaks if parked at an angle with a full tank. So my question is, what material can be used to make a gasket for inside the gas cap?? |
It will leak if parked at an angle with a full tank of gas, unless you are 1-2 gallons low of full. What happens is you shut down, residual engine heat, heats up gas, gas expands and pushes its way out of filler neck where fumes are venting. This happens on all my splits, and also well documented here on the samba. I now just installed an early bay window tank with a vent tube on top. I am routing the vent tube into a charcoal canister and then running the out line from the canister to the gas filler drain tube area. My hopes are to never have to worry about gas expanding and pouring put of filler neck when full, plus i get 50% extra capacity. So far so good!
Now as far as your seal is concerned, does it leak out when you turn left hard? If yes, then you need a new seal, if no, then seal is good but hot engine + angle parking with full tank = gas on the ground. |
|
| Back to top |
|
|
|
