Skip to content
Aussieveedubbers

Fuel in the engine... how to fix?

0 likes
Share Share on Facebook Share on X Share on Reddit

bluebus Seriously Crusin Dubber

150 posts · joined Sep 2002 ·

#883713
I made the embarrassing error of parking my 66 beetle with its nose up a steep driveway last night. Today, stinks of petrol and went "clunk" when I tried to start it. And the oil dip stick reads ridiculously high.

So it seems my fuel pump is at least somewhat dodgy (although it's never been an issue until now), which I'll deal with later. In the meantime, how do I deal with all this petrol in the engine? Obviously I'll need to drain the oil, but are there other things I should do before putting fresh oil in? Is this likely to have done anything terribly nasty?

Flat parking spots from now on 😊
66 Beetle & 66 Austin 1800... makes for a very stylish footpath 🙂

helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 ·

#883715
I have had this happen once on our Beetle.

I rolled to a flat spot.

I drained all oil/ petrol mix.

Refilled the oil to correct level.

6 years later and the engine has shown no problems.

When parking with the nose up high, the float level valve can allow fuel to seep from the tank. This is due to the angle, and the tank being higher. No big deal, it can be fixed in 10 minutes.
EJ22 into Bay Microbus - Finished project build thread- click on this spot here for info

bluebus Seriously Crusin Dubber

150 posts · joined Sep 2002 ·

#883716
That's a relief!

Thanks for that, I now know what I'll be doing tomorrow!
66 Beetle & 66 Austin 1800... makes for a very stylish footpath 🙂

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 ·

#883734
Its possible to "hydraulic" the motor and bend a conrod............turn it over by hand first to bleed the fuel out of the cyclinders👍


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

11,654 posts · joined Aug 2002 ·

#883745
bluebus wrote:That's a relief!

Thanks for that, I now know what I'll be doing tomorrow!
You need to drain the oil first...

You also need to take the spark plugs out so the pistons can go Up & down

its usually only one cylinder that fills with fuel
maybe two?? if the inlet valves are open...

You need to stop any further fuel from filling the cylinder

disconnect the fuel line going to the carby...

cheers

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

Mattriots Seriously Crusin Dubber

131 posts · joined Sep 2011 ·

#883749
Yeah as the lads said, the tank just empties through the carb cos the tank is at a higher point
Happened to me too, just change the oil, drive for a couple of days, chance the oil again
Repeat this if the dipstick still smells like fuel, and feel free to use cheapo oil if you gonna dump it in a couple of days
You don't want any fuel left in the oil, cos it'll end up washing your bearings out! Not good
But all should be fine along as you don't keep driving it like it is for months!!
Good luck!!

bluebus Seriously Crusin Dubber

150 posts · joined Sep 2002 ·

#883853
Fantastic, thanks guys 🙂
66 Beetle & 66 Austin 1800... makes for a very stylish footpath 🙂

type3lover in the garage...

796 posts · joined Feb 2005 ·

#883857
This exact same thing happened to me once in my 76 bay kombi. The engine wouldn't turn over due to the hydraulic lock in cylinder 1.

Just one extra thing to think about if you decide to remove the plugs and crank the engine to push out the fuel in the cylinders.....DISCONNECT THE COIL to ensure there is no risk of a spark igniting all that fuel!

I learnt the hard way. Fortunately the only fire damage was to the alternator and tail lamp wiring.
.

VolksVair Officially Full-On Dubber

252 posts · joined Apr 2010 ·

#884217
I think this serves as a good reminder to fit an electric fuel shut off valve, so that every time you turn your motor off, the valve locks off the fuel supply. This item can be purchased from any LPG gas centre. I think this is an absolute must for kombis, as the petrol tank is higher than the motor. cheers Frank
Adventure Before Dimentia

donn Wolfsburg Elder

3,515 posts · joined Nov 2005 ·

#884252
Surely this problem only occures if there is a fault in some other part of the system (needle seat ?). The tank in the wench is almost directly over the engine and so is always higher than the carb, so far I have never had the problem.
I dream of a day when a chicken can cross a road without being asked for it's motive!

Purple Martin Fahrvergnugen

913 posts · joined Feb 2003 ·

#884676
To empty the fuel out of the cylinders, turn the engine over by hand BACKWARDS two revolutions: turn the crank pulley two full turns anticlockwise (on a type 1 engine you can turn the generator pulley four full turns anticlockwise). Now your cylinders are empty and you won't break a rod when you start the engine. BUT now your exhaust has petrol in it.... make sure no people or dogs are standing behind when you start it, because a lot of dirty sooty petrol is going to get blasted out of the exhaust.

ALSO
You *must* change the oil before running the engine otherwise it will wear really fast because the petrol in the sump has washed the protective oil off all the surfaces.



No the problem is not the needle valve: it's just that when the carb is tipped up (by parking nose up) the petrol can flow over the rear edge of the float bowl and down the throat into the engine, filling cylinders and then leaking past the cylinder rings to fill the sump as well. The needle valve is further forward in the float bowl, so by parking uphill you've raised the needle valve higher than the rear edge of the float bowl, hence the fuel overflows.
1959 red & white Beetle
1975 Kombi camper

donn Wolfsburg Elder

3,515 posts · joined Nov 2005 ·

#884807
No the problem is not the needle valve: it's just that when the carb is tipped up (by parking nose up) the petrol can flow over the rear edge of the float bowl and down the throat into the engine, filling cylinders and then leaking past the cylinder rings to fill the sump as well. The needle valve is further forward in the float bowl, so by parking uphill you've raised the needle valve higher than the rear edge of the float bowl, hence the fuel overflows. [/quote]


So this problem has existed since the vehicles have been in existence, from new?, yet my engine dosn't have the problem (twin port single standard carb) to my knowledge, and it is parked nose up quite often, how long would it take to get enough fuel into the engine to cause a problem? I would think ANY fuel in the oil would be not a good thing, or does it only get into the combustion chamber? yet there is mention here of the oil smelling of petrol.
I dream of a day when a chicken can cross a road without being asked for it's motive!