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Throttle shaft leak!!
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420GOAT
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PostPosted: Sun Jan 13, 2008 5:26 pm    Post subject: Throttle shaft leak!! Reply with quote

ive searched already but im looking for definitive answers, today i gassed up half a tank and went driving about 10 miles and back, i noticed the throttle shaft leaking a lot. i have a new german gas cap but i dont think it is vented. when i take it off to fuel up, i hear a large amount of vacum and sometimes i hear the tank changing shape when sitting off after a while. my engine is a 1500 s/p and i run a 28 pict carb. my fuel pump is a new brosol and im guessing the push rod is origimal but im not 100 %. i noticed it sweating at the shaft but never actually pouring till now. any suggestions would be greatly recieved and appreciated. i also recently rebuilt it and have good service for months now till today. i also saw air bubbles coming from the fuel pump to the bowl via the filter. im thinking of getting a new 30 pict round bowl, is that cool? i read barb's thread on leaking shafts but i have to try the cap and other suggestions.
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thom
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PostPosted: Sun Jan 13, 2008 5:48 pm    Post subject: Reply with quote

I don't see the link betwixt the throttle shaft and the gas tank.
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420GOAT
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PostPosted: Sun Jan 13, 2008 6:10 pm    Post subject: Reply with quote

well today i put in a half tank which i usually run on only a quarter. my cap is new german which ive read is shit and not vented, after a warm afternoon of leisurely driving i think the fuel expanded pushing it through the carb and passed the shaft.....am i crazy, this happenned today and it has not got a warm day workout with a half tank before.
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PostPosted: Sun Jan 13, 2008 6:39 pm    Post subject: Reply with quote

When my cap wasn't venting it would make a vacume sound like yours is, but what really let me know it wasn't venting is I thought I ran out of gas about 3 times(pretty bad it took that long to figure it out) and each time I opened the cap air would rush in & let gas flow to the carb. I never had pressure build forcing gas out the carb. That almost sounds like you float needle isn't closing when the bowl fills alowing to much fuel into the carb.
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PostPosted: Sun Jan 13, 2008 6:57 pm    Post subject: Reply with quote

what makes you think your throttle shaft isn't worn. pretty common. is this a newer carb??
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PostPosted: Sun Jan 13, 2008 8:00 pm    Post subject: Reply with quote

Sounds like you need a vented cap and your carb re-bushed.
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Eric&Barb
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PostPosted: Sun Jan 13, 2008 9:42 pm    Post subject: Reply with quote

Get a vented cap before the tank cracks!! As for the throttle shaft leaking it can be nice and tight, but will still leak if fuel is pouring into there.
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Campy
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PostPosted: Sun Jan 13, 2008 11:00 pm    Post subject: Reply with quote

Many years ago, I left my 1957 buses gas cap at a gas station near Lake Tahoe and bought another one after I was too far away to go back and get it. Later, I found out that the new cap was unvented: on a hot day with the bus in the garage, overnight, there was the strong odor of gasoline. I checked the engine oil and gasoline was in the crankcase, mixed with the engine oil. The gasoline had expaned with vapor as it got hotter and, since the vapor couldn't be vented, the fuel was forced through the carburetor and down into the heads. That is probably why gas has been escaping between the throttle shaft and throttle bushings (pressure).
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420GOAT
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PostPosted: Mon Jan 14, 2008 9:18 am    Post subject: Reply with quote

thank you guys!! i read up on caps more than throttle shafts and i tapped a tiny hole with my tiny drill bit at 12 of the clock. i started it up this morning and i checked on the carb off and on for about 10 minutes as i warmed it up. drove it to work and checked it after i parked it. no leaking. im sure the shaft is worn but it had never leaked that bad before. i smell a little gas in the engine and will change my oil asap!! i still plan to buy a nos 30 pict, on that note will a nos one need rebuilding anyhow since the rubber inside is old, or is there luck with nos carbs? i want a new solex and dont want a brazilian solex. but 200 bucks on something i need to rebuild is bit much too.
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Stocknazi
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PostPosted: Mon Jan 14, 2008 9:50 am    Post subject: Reply with quote

what is causing the leaking of gas is the steel throttle shaft wearing into the aluminum casting of the carb, a gasket does not make that seal. you can have your og carb rebushed.
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420GOAT
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PostPosted: Mon Jan 14, 2008 10:17 am    Post subject: Reply with quote

just wondering if ishould rebush the 28 pict or get a new 30 pict round for my bus? i thought 30is original but in my abridged manual i see a 28 pict as original.
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Campy
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PostPosted: Mon Jan 14, 2008 6:18 pm    Post subject: Reply with quote

Yoy still need to buy a vented gas cap, which doesn't let the vapor go staight out or the air straight in. Having a hole through the cap, in effect, makes the fuel tank a potential bomb.
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420GOAT
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PostPosted: Tue Jan 15, 2008 10:01 am    Post subject: Reply with quote

IM ON IT , try to get one this week.
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PostPosted: Tue Jul 19, 2016 10:31 am    Post subject: Re: Throttle shaft leak!! Reply with quote

I have been having a problem with gas leaking from the carb throttle shaft, and think it could be the needle/seat. This carb was removed carb(30 pict-1) and cleaned it up recently. Original needle/seat cleaned/re-used.

I notice the leaking shaft about 5 minutes after the warm motor is cut off. Sometimes it takes longer to start after being shut down for about 5 minutes; Holding the throttle open seems to help. I have an og vented gas cap as well; checked and no pressure in the tank.


Any idea if this could be the needle/seat?

I have had issues in the past with the needle/seat that comes in the carb kits not shutting off the flow of gas like they are supposed to. Should I have shimmed the one in the kit differently, or is that a common problems with these aftermarket kits?
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PostPosted: Tue Jul 19, 2016 11:11 am    Post subject: Re: Throttle shaft leak!! Reply with quote

It could be:

1. Too much fuel pressure. Check for this first.

2. Too heavy or cracked float. Replace with a known good one to see if the problem goes away.

3. Bad shut off valve, or debris has gotten into the valve.

4. Not thick enough gasket on the float valve. We had to install two to keep fuel from leaking in hot weather.

5. Crack in float chamber.


As for holding the throttle open that is just dumping all the fuel down into the P&Cs where it will pass by the rings to thin out the engine oil which in turn can get so thin that the moving parts of the engine no longer get lubricated....
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PostPosted: Tue Jul 19, 2016 2:53 pm    Post subject: Re: Throttle shaft leak!! Reply with quote

Is there a way to determine how many/how thick a gasket is installed under the valve? I know there a several different sizes/thickness of metal/fiber washers in the rebuild kits, along with the small plastic measuring ruler that I have never used.
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PostPosted: Tue Jul 19, 2016 3:10 pm    Post subject: Re: Throttle shaft leak!! Reply with quote

Probably mentioned in one or more of the Bentley manuals.

Did a quick search for "carb float gasket" in the forums and came up with this one of several results.

http://www.thesamba.com/vw/forum/viewtopic.php?t=511975&highlight=float+valve+gasket+thickness
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PostPosted: Sun Jul 24, 2016 6:28 pm    Post subject: Re: Throttle shaft leak!! Reply with quote

Replaced the needle/seat with another used original and 1 thick/1 thin washer; still leaks after shut-down.

Checked fuel pressure, 2.5psi

I may try and change the float and use 2 thick washers under the needle/seat and see what happens.
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PostPosted: Sun Mar 19, 2017 9:09 am    Post subject: Re: Throttle shaft leak!! Reply with quote

I've been dealing with this on my bus for a while now, it's getting annoying. It's doing this on a Volksbitz restored 28 pict-1 (as it did on my old carb). I've tried thicker gaskets under the needle, different floats, checked the fuel pressure, OG vented gas cap, correct heat riser gaskets, higher octane fuel. Engine runs cool, I drove it around for a few hours nonstop last weekend, killed it and watched. It didn't start leaking out of the throttle shaft until about 45 minutes or so after sitting. So it's definitely a heak soak issue. I'm thinking about trying a phenolic spacer: https://www.thesamba.com/vw/classifieds/detail.php?id=1971933
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Eric&Barb
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PostPosted: Sun Mar 19, 2017 9:26 am    Post subject: Re: Throttle shaft leak!! Reply with quote

You say you tried thicker gaskets under the needle valve. Have you tried two gaskets?

Doubt that the phenolic spacer will do much when the Summer heat comes your way.
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