 carb floats, still leaking - replace float valves? |
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| zeezee |
 Jul 8 2012, 11:15 PM
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#1
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Member  Group: Members Posts: 115 Joined: 16-October 08 From: san ramon, ca Member No.: 9,651 Region Association: Northern California  |
I pushed my car out of the garage and down the driveway to give it a bath. But I couldn't get it started to drive it back up. So it spent the day on an incline with the charger plugged in. Hours later its back in the garage.
BUT the dipstick is WAY over full and smells like gas. I suspect carb floats are not doing their jobs and let the gas tank just drain right into the engine. Or is a 25ish% incline too much for the floats to work properly? |
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| Elliot Cannon |
Jul 8 2012, 11:19 PM
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#2
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
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Sounds like the floats are stuck and an overhaul of the carbs is in order.
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| VaccaRabite |
Jul 9 2012, 11:27 AM
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#3
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En Garde! Group: Admin Posts: 13,441 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
you need to measure, in MM, how far they are from the carb top when open and when closed. When they close the ball valve, they should be ~10mm. When all the way open, they should be 32.5mm. The floats should be able to move totally freely.
Measurements are taken from the top of the float to the bottom of the carb top with the gasket removed. Get a copy of the Weber Tech Manual by Bob Tomlinson from Amazon. Its really helpful for getting carbs done and running for a VW. Zach |
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| jmill |
Jul 9 2012, 11:45 AM
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#4
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
I had a steep driveway and the same problem and set mine at 12 mm with the gasket. YMMV. For some reason I thought it was 10 with the gasket and 11 without.
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| ThePaintedMan |
Jul 9 2012, 11:51 AM
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#5
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Advanced Member Group: Members Posts: 3,885 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States
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Has it ever done this before? Did the car sit for awhile?
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| zymurgist |
Jul 9 2012, 12:32 PM
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#6
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"Ace" Mechanic Group: Members Posts: 7,411 Joined: 9-June 05 From: Hagerstown, MD Member No.: 4,238 Region Association: None |
If the dipstick is way overfull and smells of gas, I would change the oil before starting the engine again.
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| ThePaintedMan |
Jul 9 2012, 12:57 PM
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#7
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Advanced Member Group: Members Posts: 3,885 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States
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QUOTE(zymurgist @ Jul 9 2012, 02:32 PM)  If the dipstick is way overfull and smells of gas, I would change the oil before starting the engine again. (IMG:style_emoticons/default/agree.gif) |
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| zeezee |
Jul 9 2012, 11:45 PM
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#8
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Member Group: Members Posts: 115 Joined: 16-October 08 From: san ramon, ca Member No.: 9,651 Region Association: Northern California |
took floats out - appeared ok. adjusted to specs. left side pushed a lot of gas out of the bowl when replaced - so it may have been stuck before I took it apart. I let the pump run a bit, no overflow noticed.
oil change tomorrow. hopefully back on the road after that! Thanks for the help! |
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| ThePaintedMan |
Jul 10 2012, 08:13 AM
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#9
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Advanced Member Group: Members Posts: 3,885 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States
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Yep, that should be it. When I first put the Webers on mine my float stuck open and I had gas coming out of the top of the carb. Usually you can rap on the block-off plate with a few light taps and it will free the stuck float. But then again, taking it apart to check everything once in awhile isn't a bad idea. Have fun!
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| zeezee |
Oct 8 2012, 10:39 PM
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#10
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Member Group: Members Posts: 115 Joined: 16-October 08 From: san ramon, ca Member No.: 9,651 Region Association: Northern California |
Engine is full of gas again. I suspect the float valves are not working properly. I can give them (another) good cleaning.
At $11 each I suppose I could just replace them - What's the likely-hood of them being worn out or beyond cleaning? |
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| ThePaintedMan |
Oct 8 2012, 10:54 PM
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#11
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Advanced Member Group: Members Posts: 3,885 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States
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QUOTE(zeezee @ Oct 9 2012, 12:39 AM) Engine is full of gas again. I suspect the float valves are not working properly. I can give them (another) good cleaning. At $11 each I suppose I could just replace them - What's the likely-hood of them being worn out or beyond cleaning? Again, be forewarned I am not a carb guru, at least not yet. But it sounds like at least one is sticking. But, the bigger question is why its getting enough pressure to allow gas into the bowl even with the float stuck? Combined with the dead battery, it sort of sounds like the fuel pump is staying on for whatever reason. I had an old T-Bird that did this very thing, but I had stupidly tried to regulate the stock FI pump pressure down to carb pressure when I converted it to a carb. You don't somehow still have the computer and FI pump still hooked up, right? Easy fix would be to start with rebuilding the carbs. As you said, the kits are cheap, and its only a couple hour job. Probably worth it. |
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