Here’s some advice if you need to do a DIY fuel drain to remove wrong fuel
If your car has an electric fuel tank pump, then there is a way to do a fuel drain yourself,
You need, containers (enough for all the fuel you have in the tank) 2 metre length of hose, and depending on type of car, some basic tools,
It is advisable if you also clean fuel (20 litres) to hand.
This works on most bmw, mercedes, citroen, peugeot, vw, audi, fords – if your diesel car makes a gentle buzzing noise for a few seconds when you put the key in the lights on position (the buzzing is the electric fuel pump priming the system) then this will most likely work.
This method is very hard on the cars battery and if it is not in good condition may flatten it, keep jump leads handy and another donor car, or be at the top of a hill
The skill level required to do this would take someone that is mechanically minded, and is aware of the safety precautions required when working with petrol and diesel.
1) Find the fuel line coming from the tank to the engine, you need to flow line to the engine, not the return line to the tank
2) disconnect the flow line and attach a hose to it, (you will need to get blue peter about it unless you have full garage facilities at your disposal)
3) put the other end of the line into a container
4) turn the key, not to starting position, just to pump priming position, this will activate the fueltank pump for 5 to 10 seconds which will send about a cupfull of fuel through the hoseline, then the pump will switch of again
5) keep repeating the same thing, turn the ignition off, then back to accessory position for 5 seconds, you might have to do this 200 times or more, it takes ages to drain a full tank.
6) once the tank is empty you will start getting foamy white fuel out, this is air that has entered the system from the empty tank
7) now pour in the clean fuel to the tank
8) repeat the key turning process again and again untill approximately 2 litres have gone thru, this purges the wrong fuel and fills the filter and lines with clean fuel
9) re-connect the fuel system and start the car
once the car starts you should fill it again to the top with clean fuel.
Petrol is highly flammable and this should be done in an area that is safe to do it,
Sometimes fuel cannot be removed from a filler neck, petrol cars in particular have permanently sealed fuel lines with no easy access points, there are a number of ways to skin a wrong fuel cat, here’s one of them
This is a back seat of a C1, I accessed the tank from underneath the seat, the seat lifts up with a hard tug, most bench seats are held on by 2 clips, these clips are just push clips so a tug is all you can do, dont be scared of breaking them – they are designed to give, when youre done just push them back into place, make sure to pull the seat belts through the bench seat when you put it back together or you will und up with the female clips hidden under the seat!
Above This is the cover for the tank, it is attached with a sticky type glue that reseals after it has been removed, prise it off with a large screw driver, being carefull not to kink the thin metal,
The cover is off and I have unclipped the feed line (top line)
I have now connected my scavenger hose directly into the feed line and have drained the tank, in this case all that was needed was a tank drain becuase the car had not been driven.
Note the big blue ring, this is a screw cap that holds the sender unit into the tank, if you unscrew this ring (very carefully) you can lift the sender unit out and you will be looking into the fuel tank, you can then syphon directly from the tank this is the most DIY freindly method if you do not have a pump. you cannot syphon off the hose directly becuase you need too much suction to pull through the fuel pump which is housed in the tank
Be carefull if you plan to do your own fuel drain after a mis-fuel, I know many people attempt it at first before calling us and I am happy to talk anyone through a fuel drain if they need expert help, I don’t mind giving out free advice and welcome your calls and comments
But please be careful, petrol is very flammable, it would be wise to read up on the safe handling of petrol before doing a fuel drain, just because fuel is contaminated doesn’t make it any less volatile