carbs leak fuel into engine overnight!

type3lover in the garage...

796 posts · joined Feb 2005 · 18 Mar 2005, 5:27 pm

#321471

Hey all,
I got into the kombi to go to work this morning and it wouldn't crank over at all. Opened the engine lid and noticed that the carb on the right had petrol all over the outside and had run down the manifold and even leaked onto the ground.
Then I managed to get it to crank over and saw heaps of fuel vapours coming out the exhaust. Had to remove the plugs on cylinders 1 & 2 and then crank the starter to expel all the fuel that had filled the engine overnight. Also took off the carb and checked needle and seat for any any sign of sticking, tightened everything and put it all back together. Runs fine - no leaks. Basically the cylinder full of fuel was "hydraulicing" - since liquid cannot be compressed as the piston tries to travel up the bore and that's why it wasn't cranking over at all.
BUT...this is the second time this has happened now. Last time was the left carb.
What is going on? Anyone ever had this happen?

Car: 1976 kombi
Engine: 2 litre
Carbs: standard solex 34PDSIT
Fuel pump: electric

TIA for any advice!
Toby

[Edited on 18-3-2005 by type3lover]

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toplessbug Fahrvergnugen

879 posts · joined Aug 2002 · 18 Mar 2005, 8:07 pm

#321552

your bum is lower than your front, fuel siphons from the carb bowl up the vent tube and down the venturi thru the open valve and presto a guts full of fuel.. the easiest fix is reverse into your parking spot so your bum is in the air

kombibob AKA: Volkswagen Type 2 Transporter Van Robert

1,698 posts · joined May 2004 · 18 Mar 2005, 8:20 pm

#321558

faulty needle and seat 'remove and replace
and dont drive without a oil change

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68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 18 Mar 2005, 10:02 pm

#321616

[/b] Yes, VERY Important to change Your oil as fuel will have leaked past the rings into the sump....

Take out the dipstick & smell it.... it will smell like petrol....

The oil is diluted with petrol.... Don't drive the vehicle....

Needle & seats should be changed in both carburetors...
the fuel is running into the fuel bowl in the carburetor
[thru the needle & seat] & overflowing into the inlet manifold.

I always renew the needle & seat every few years....
they do wear out and leak.... thats why they are renewable.

[/b] Lee

http://community.webshots.com/user/vw68autobug

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

Midlife crisis Nartispuddlejumper, Bureau of Toxicity

2,282 posts · joined May 2003 · 18 Mar 2005, 10:45 pm

#321641

I also put a fuel cutoff switch from a LPG system in the fuel line where it comes out the tunnel with the wire going to the coil to power the switch just a backup.

Marc

[Edited on 18-3-05 by Midlife crisis]

If you can't laugh at yourself you can't laugh at anyone else! Because life is to short not to LAUGH

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 18 Mar 2005, 10:48 pm

#321643

Although a fuel cutoff switch is a great idea, I have one...
it won't stop the needle & seat from leaking....
it can happen in traffic if the carburetor is full and the needle & seat start leaking.... the engine will flood and cut out....

Its best to replace the needle & seat...

Lee

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

BUS-234 Casual Dubber

32 posts · joined Jan 2004 · 18 Mar 2005, 11:02 pm

#321648

Yeah this same thing has happened to me two or three times before. i used to have a lot of crap in the fuel tank and a particle must have got stuck in the jet and left it open, i park on an incline too. so basically the same thing happened. now im running three fuel filters, one at the outlet of the tank and one just before each carbie. havent had the problem since. as the guys said u will need to change your oil too

Buses are the best....

type3lover in the garage...

796 posts · joined Feb 2005 · 19 Mar 2005, 3:06 pm

#321906

Shit I drove it to work (about 3km). Am I doomed for engine leaks/failure?
Oil level is normal, and I only changed it last week. Used ACE 30 too!
I usually park on an incline in my driveway so that might be making the problem worse. Tonight I reversed in instead!
Last time it filled the sump with fuel but this time seems quite minor.
I can't understand why so much fuel has made its way past the pump!
Any details on the LPG valve?
Also do I need a full carby kit or is the needle and seat available as a separate part?
Thanks so much!
Toby

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Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 · 19 Mar 2005, 3:54 pm

#321916

u can buy needle and seats seperate to the carby kit. but if u are going to do it u may as well do the whole carbys. ive had this problem and rebuilt my carbie and now it seems ok tho i still try not to park nose up. change your oil anyway.

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type3lover in the garage...

796 posts · joined Feb 2005 · 25 Mar 2005, 4:12 pm

#325354

Parking the van bum up in the driveway seems to have stopped any problems. New carb kits have been added to the wish list :-) which is getting longer and longer...
Pity to have to do the carbs since it drives so well usually.
Cheers!
Toby

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68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 25 Mar 2005, 4:20 pm

#325361

Hi Toby,
Just buy the needle & seat kits....

take the top off the carby & replace them....

but price both first as a full kit may be the same as a needle & seat....

Late Beetles had a cutoff valve in the fuel pump.....

or just keep parking back to front... 🙂🙂

Lee

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

h fractals - an ever changing lifestyle

7,671 posts · joined Feb 2005 · 25 Mar 2005, 10:47 pm

#325488

definatly faulty needle and seat had this prob many times with several bays..
'remove and replace and dont drive without a oil change as fuel in oil not good to drive on.. check fo fuel in oil (smell) 😉
all very impotant tips and just before you install your needle n seats check that they dont and wont get stuck open manually wif fingers cause if they do try n get some more that wont..
painful but ya gotta do it for ya bus man.. 🙂

[Edited on 25-3-2005 by h]

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