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Re: car wich is lagunna 53 plate
Hi common fault on these cars is the key card and card reader there are unreliable do you have your back up key card if so try it as if your tanks half full parking on a hill would make no differance its only when the tanks low you can sometimes get problems
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Yes it sounds like you have found your own problem the float in your petrol tank is faulty and needs to be checked out. Check the wiring to the gauge is ok before doing anything at the end where the wires connect to it.
Hopefully your vehicle will have a drain plug in the bottom of the fuel tank*: remove this & drain the fuel.
With the plug still removed flush about 5-10 litres of fuel thru by putting in thru the tank filler hole as usual.
Replace the drain plug and put a FULL tank of fuel in (this will dilute any residue as much as possible)
*In the case of no drain plug the fuel tank will need to be removed & fuel drained out thru the filler neck, drain fuel, replace tank & procede from the 'put a FULL tank of fuel section of this instruction.
If the vehicle has been started with the bad fuel remove the fuel filter.
If the vehicle has an electric fuel pump* (more modern vehicles ie. Post 1985 [some vehicles still had & still do have mechanicle fuel pumps]) turn the ignition on with the fiter not in place, vthis will flush fuel thru the fuel lines pushing out the bad/old fuel. Take care as the fuel will be under a fair bit of pressure & "sqirt' out.
*If it is a mechanicle pump this can not be done in this way.
Replace the fuel filter with a new one.
Bleed the fuel system & start the vehicle.
Allow the vehicle to idle for 10-15mins before going back to your usual driving.
All shld now be ok but it is a good idea to routinely inspect the fuel system for leaks over the nxt 10 000km or six months (wich ever is earlyest) as in the case of puting petrol in diesel or diesel in petrol the different rubber and plastic items (such as 'o' rings) can begin to deteriate & leak in wich case they will require replacement.
All the best & I hope this is of some help & it works out for you...
Your problem is the fuel gauge sending unit. It needs to be replaced. Another benefit of owning the durable festiva is the access panel under the back seat. You don't have to drop the tank to fix this problem.
I had same problem with petrol gauge bouncing around all over the place, full tank, half a tank and nearly empty in the space of 10 miles.
I knew that if I filled the tank I would get approx 200 miles for half a tank so I did that for a while and just kept topping up. Audi testing it and the fuel sensors in the tank had to be replaced. I'm afraid its the only permanent solution!