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Drain / Syphon Fuel on my MK5

liamb2001

Passed Driver's Ed
Location
UK
Hi guys, just had a call from my mrs telling me shes put £20 of unleaded in our MK5 diesel car, i told her not to drive or start it up and she hasnt and fortunatley its round the corner at my local petrol station.

I myself drained my old corrolla by unbolting a screw underneath but ive looked and cant seem to find anything on this car, ive also tried putting a long pipe down to syphon it but it doesnt seem to work apart from making my very light headed for 20 mins !!

I really DO NOT wanna fork out 180 quid which is what im being quoted from all these fuel doctors etc, PLEASE HELP !!!
 

The Fed

Old Guys Rule
Location
Florida
How many liters is that? I would buy a liquids hand pump. I believe petro is much lighter than diesel fuel, so stick the hose down a little at a time, and you should be able to pump out most of the gasoline. Or just siphon out the whole tank and refill with diesel. A little gasoline won't hurt as long as it's mixed.

You run into problems when you are running pure diesel then suddenly get mostly petrol into the motor. That can blow the head gasket.

I don't think they put drain plugs in anymore. The only other choice to is remove the back seat and access the plug on the top of the tank you can siphon from there. I'm not sure you can drop the tank without accessing the top.
 

liamb2001

Passed Driver's Ed
Location
UK
thanks for the reply guys, £20 is about 13 litres and ive been told by the AA breakdown website that 5 litres of petrol in a diesel engine is perfectly fine on a diesel car (the car was just warning on empty yesterday with not much more usage) so with what i predict at the 15 litre empty stores (confirm if im wrong on this) i figure if i can suck out around 10 litres of petrol i should be ok to top up the full tank.

so can you confirm there is definitley a way of geting to the fuel tank from the back seats then ? because when i tried i couldnt get the seat up properly ...admitley it was starting to get dark and couldnt see a thing

Ive been reading stories of people putting 30% petrol and 70% diesel on work vans / cars and saying the car ran funny for a while but went back to normal saying its not as bad for a diesel engine to have petrol in the system as it is for petrol cars to have diesel in the engine ......i personally havent a clue !!

such a massive pain in the arse all this lot and i really do not fancy forking out 185 quid for something i could potentially do myself :(



How many liters is that? I would buy a liquids hand pump. I believe petro is much lighter than diesel fuel, so stick the hose down a little at a time, and you should be able to pump out most of the gasoline. Or just siphon out the whole tank and refill with diesel. A little gasoline won't hurt as long as it's mixed.

You run into problems when you are running pure diesel then suddenly get mostly petrol into the motor. That can blow the head gasket.

I don't think they put drain plugs in anymore. The only other choice to is remove the back seat and access the plug on the top of the tank you can siphon from there. I'm not sure you can drop the tank without accessing the top.
 

liamb2001

Passed Driver's Ed
Location
UK
managed to get to the fuel finally and trying to syphon the fuel but the flow just isnt working, i get a mouthfull put it down into the basin and it flows for a second then stops

anyone wanna give me some tips on syphoning ?
 

espo92

Ready to race!
Location
Orlando, Florida
Ride
2008 Rabbit
You did make sure the bucket or whatever your dumping it into is lower than the actual petrol tank right? It's not just the top of the tank, the level of the fuel tank to the ground would cause the issue your having, if that's the only thing wrong.
 

liamb2001

Passed Driver's Ed
Location
UK
yeah did try it but the flow didnt contiinue been using a fish tank hand pump for the last 3 hours and got around 15 litres of it pumped out, ive put it all back together and have been for two trips (on foot) the the petrol station to fill my 5L of petrol....i mean diesel lol ...shouldnt joke !!! i figure do it 2 more times then drive to the petrol station and top it right up to the brim !!!

does anyony know what the reserve tank is on a mk5 golf ?
 

The Fed

Old Guys Rule
Location
Florida
US versions don't have reserve tanks, like on motorcycles (do motorcycles still use them?)

Don't know about EU versions. Are you referring to the amount of fuel left when the low fuel light comes on? That's just telling you how much you have left - there's no separate tank inside.

Good to hear you were able to pump out the excess fuel. Did you unscrew the cap or just hook up to one of the fuel lines?
 

liamb2001

Passed Driver's Ed
Location
UK
yeah not exactly how i wanted to spend my sunday but hey, yeah the car was reporting empty the day before and wed done around 10 miles in it since then...the wife doesnt like going to petrol station ya see...in fact I DON'T like her going to petrol station any more lol !!!
so how much roughly is left in the tank when the warning light goes on then ? anyone know ? ive reasd on the MK4 that its 7 litres
 

The Fed

Old Guys Rule
Location
Florida
It varies but mine comes on at about 3 gallons. The only way to know for sure is to fill it up as soon as possible after it goes on. GTI's also have the "miles to empty" display so we don't need to worry about it.
 

liamb2001

Passed Driver's Ed
Location
UK
must be a useful feature

well ive been to petrol station and pretty much filled the tank now (with diesel) and it runs ok ...gonna take for a belter of a run now and hopefully itll run through the fuel line and be fine.

For anyone reading this topic in future, it really is an easy job to empty your tank if you put the wrong fuel in it but before even attempting find yourself some kind of pump or better syphon method than sucking a pipe and you will be fine
 

ToeMoss

Brain Dead
Location
Hella Cali
You did make sure the bucket or whatever your dumping it into is lower than the actual petrol tank right? It's not just the top of the tank, the level of the fuel tank to the ground would cause the issue your having, if that's the only thing wrong.
My guess is that the fuel tank cap + nozzle flap thingy were not opened at the time.
 

Phil1964

New member
Location
Evesham/worcestershire
Ride
Golf
I did the same last sat,i put nearly £15 in mine.when I noticed i got pushed off the pump
i took the back seat out and took off the cover to get to the fuel pump.i tried to syphon some out and was using just some hose.anyway after many mouthfull of patrol i managed to nearly fill a 5lt container then put the ring back on and filled the tank up.drove car home,only 2 miles slowly.no smoke or judder i have ordered a £12 siphon transfer pump and im going to pump out most of the fuel again.will the put some fresh fuel in maybe £20 then when i refill again will start using the other fuel i took out maybe a few ltrs at a time. and once my container is half full i will top it up full and then put the whole lot back in.should be diluted enough then.its not hard to take take the back seat out.only 4 clips, and all you need is a flat screw driver and if jot a hammer just something to tap the screwdriver to move the metal ring.anti clockwise and it moves easy to.what i did notice because the tank is low when trying to siphon with just a pipe its hard to get the fuel to flow because they are on the same level but it does start if you get it right.
 

GTI's

Go Kart Champion
Location
MD
The last time I had to remove fuel from the tank I remove the Lpfp and used one of these with clear hose to a container outside of the car.




Perhaps the fuel line to the engine bay can be opened up and use the in tank Lpfp to drain tank, just don't know if I want to drain the tank completely that way because the Lpfp would be running dry and the fuel is actually used to cool the pump down, that's one reason you should refill when at a 1/4 tank.



Be safe don't want to go boom.
 
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