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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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 Posted: Wed Mar 18, 2015 10:18 pm Post subject: Please help Carburetor driving me nuts |
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| after a few minutes of driving and then shut off the bug. As its sitting for about 5-10 minutes it's starts to leak fuel out of the injection tube. Now here's the kicker it leaks with the top of the carburetor off. Carburetor is a Solex 30 pict 1. The carb has been rebuilt. Fuel pump is new And Running fuel pressure is 3.5lbs and after its shut off fuel pressure goes to 5lbs then starts to drop. But keep in mind it leaks with the top of the carb off. So I really don't think its fuel pump related. |
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Volks Wagen
Samba Member
Joined: February 13, 2013
Posts: 2926
Location: Germany
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| Posted: Thu Mar 19, 2015 2:47 am Post subject: |
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Does it keep leaking or does it leak a bit and then stop? If the level in the float bowl is too high then a bit will leak out. This might mean a bad float or you need to adjust the float level.
The title of your post reminded me of this:
Guy walks into the doctor with a steering wheel down his trousers and says "I've got this problem and it's driving me nuts". Good innit?
_________________
1973 1303 with AB-motor - sporadic
reconstruction as time permits, 1986 ex-Bundeswehr Doka - on the road again.
I'm definitely, probably, the worlds greatest lover.
Aithníonn ciaróg ciaróg eile. |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Thu Mar 19, 2015 8:20 am Post subject: |
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| Lol. Yes it leaks for a lil bit then stops. It has a new float in it. |
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Volks Wagen
Samba Member
Joined: February 13, 2013
Posts: 2926
Location: Germany
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| Posted: Thu Mar 19, 2015 4:50 pm Post subject: |
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The fuel needs to be about 12-14mm below the top of the bowl...although this is more of a 'it depends' scenario, but it's a start. To change the fuel level in the bowl, you need to add or remove washers under the needle valve in the top of the carb. Adding washers means the valve closes sooner as the float rises with the fuel level, thereby shutting off the fuel sooner, and reducing the fuel level in the float bowl. Try adding a washer or using a thicker washer and see if that cures it, then take it out for a hard run and see that it all works well.
_________________
1973 1303 with AB-motor - sporadic
reconstruction as time permits, 1986 ex-Bundeswehr Doka - on the road again.
I'm definitely, probably, the worlds greatest lover.
Aithníonn ciaróg ciaróg eile. |
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15982
Location: North Florida, USA
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| Posted: Fri Mar 20, 2015 3:38 am Post subject: |
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| Lpec900 wrote: |
| after a few minutes of driving and then shut off the bug. As its sitting for about 5-10 minutes it's starts to leak fuel out of the injection tube. Now here's the kicker it leaks with the top of the carburetor off. Carburetor is a Solex 30 pict 1. |
Not sure what you mean by "injection tube". This was the best pic I could find of a 30-series carb with the top removed. Where is the fuel flowing from?
If the fuel level in the bowl is too high it can flow from the discharge tube, especially when the car is nose up on a hill.
_________________
AshMan40
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'67 Beetle #1 {project car that never made it to the road  }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Fri Mar 20, 2015 6:18 am Post subject: |
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| It's coming from the accel dump tube. Float setting is good and it's still doing it. And replaced the needle valve twice. |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Sat Mar 21, 2015 8:59 am Post subject: |
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| Update I put another fuel pump and Carburetor on yesterday and it did the same thing... |
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Volks Wagen
Samba Member
Joined: February 13, 2013
Posts: 2926
Location: Germany
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| Posted: Sat Mar 21, 2015 1:25 pm Post subject: |
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Just wondering is your accelerator cable moving the arm after it's shutting down somehow.. What carb did you put on another 30 PICT 1?
_________________
1973 1303 with AB-motor - sporadic
reconstruction as time permits, 1986 ex-Bundeswehr Doka - on the road again.
I'm definitely, probably, the worlds greatest lover.
Aithníonn ciaróg ciaróg eile. |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Sat Mar 21, 2015 3:05 pm Post subject: |
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| I put a Solex 30/31. Maybe I have the accelerator cable wrong. I have pulled enough to take the slack out of it. What should it be. |
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Volks Wagen
Samba Member
Joined: February 13, 2013
Posts: 2926
Location: Germany
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| Posted: Sun Mar 22, 2015 10:34 am Post subject: |
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| Lpec900 wrote: |
| I put a Solex 30/31. Maybe I have the accelerator cable wrong. I have pulled enough to take the slack out of it. What should it be. |
Not sure. Can you post a few pics of your carb installed from a few angles? Then folks might spot something.
Here's how to post photos:
http://www.thesamba.com/vw/forum/viewtopic.php?t=6
_________________
1973 1303 with AB-motor - sporadic
reconstruction as time permits, 1986 ex-Bundeswehr Doka - on the road again.
I'm definitely, probably, the worlds greatest lover.
Aithníonn ciaróg ciaróg eile. |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Sun Mar 22, 2015 7:10 pm Post subject: |
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| Ok. I will post some shortly. Thx |
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15982
Location: North Florida, USA
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| Posted: Tue Mar 24, 2015 4:10 pm Post subject: |
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| Lpec900 wrote: |
| I put a Solex 30/31. Maybe I have the accelerator cable wrong. I have pulled enough to take the slack out of it. What should it be. |
Normally, you should adjust the throttle cable so you can achieve full opening of the throttle (vertical throttle plate) when the pedal is fully depressed. I don't like the feel of this as the pedal rests very low to the floor. So I adjust it so it is fully open before the pedal reaches the floor. There are two problems with this method:
1) You risk stressing the throttle arm as it is the only thing stopping your "lead foot"
2) It may be possible to "over open" the throttle so it is beyond fully open and has started to close again. This means you don't get max acceleration when you "floor it ".
_________________
AshMan40
---------------------------
'67 Beetle #1 {project car that never made it to the road }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Fri Mar 27, 2015 8:21 pm Post subject: |
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| Ok update... I was just told its normal cause the fuel is oxygenated and it's just boiling over. 😕 .... what are you thoughts on that. |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Mon Mar 30, 2015 4:51 pm Post subject: |
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| Ok I am having problem loading pics. But Here's an update. I put a electric fuel pump in. Electric fuel pump is in putting out 3psi and goes to zero after shut down. And it still leaks. |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Mon Mar 30, 2015 9:41 pm Post subject: |
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| Another update put a 3rd carb on a 30 pict 2. And guess what it still leaks. 😡 I have video of it. But can't seem to load it. |
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Lpec900
Samba Member
Joined: February 23, 2015
Posts: 45
Location: Henderson, NV
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| Posted: Sun Apr 05, 2015 10:10 am Post subject: |
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| Update 4th Solex carb and installed Holley fuel pressure regulator. I Dialed the pressure down to 1.5psi and still leaks after shut down. Anyone got any ideas cause I am running out of them. |
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kreemoweet
Samba Member
Joined: March 13, 2008
Posts: 3897
Location: Seattle, WA
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| Posted: Sun Apr 05, 2015 10:38 am Post subject: |
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You should have listened to the person who told you it's normal, cuz it is. Gasoline, like every other fluid, expands
when heated. The gas in the carb will start absorbing heat from the engine after it's shut down. The gas above the check ball in the accel. circuit has nowhere to go except out the nozzle when it
expands. The amount of gas "leaking" that way is insignificant. If the gas contains very volatile additives, such as
alcohol, and the heat is enough, you can get vapor bubbles forming in the gas, which will force even more gas out
the nozzle.
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'67 bug: seized by the authorities
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Stop dead photo links! Post your photos to The Samba Gallery! |
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Q-Dog
Samba Member
Joined: April 05, 2010
Posts: 8698
Location: Sunset, Louisiana
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 15982
Location: North Florida, USA
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| Posted: Sun Apr 05, 2015 3:03 pm Post subject: |
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| Lpec900 wrote: |
| Update 4th Solex carb and installed Holley fuel pressure regulator. I Dialed the pressure down to 1.5psi and still leaks after shut down. Anyone got any ideas cause I am running out of them. |
First off, stop messing with the fuel pump. It has no direct impact on the accelerator pump discharge. The fuel pump fills the fuel bowl until the float and inlet valve cut off the flow. If there is too much pressure you would see the fuel level being to high in the bowl, or fuel fleeing from the discharge nozzle. The fuel pump cannot force fuel to come out of the accelerator pump tube.
Since you have the same problem with different carbs it is likely not something specific to the carb. Look at how the accelerator cable is connected. Make sure there is nothing pulling on it as the engine sits.
The fuel expanding in the accelerator pump circuit is possible I suppose but the amount of fuel would be minimum. What problem is this leak causing?
Also, how hot is your engine? If it is heat related, you may be able to confirm this by opening the engine lid and get a fan to blow air into the engine area. This should minimize the heat transferred to the carb. Does this prevent the fuel discharge?
_________________
AshMan40
---------------------------
'67 Beetle #1 {project car that never made it to the road }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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Harleyelf
Samba Member
Joined: April 23, 2009
Posts: 1572
Location: Appleton, WI
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| Posted: Sun Apr 05, 2015 4:26 pm Post subject: |
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| Is your accelerator pump linkage correctly adjusted? |
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