I NEED HELP PLEASE (gas tank issue)

[dfm990]

Long story short, because of an accident previous owner of the car (2010 A4 B8 CVT) had, there seems to be a small leak in the gas tank. It started when a CEL came up and when i VAG'd it, it said P0456 (very small leak in the evap system.) I took it to audi and they ran all their tests and whatnot, and called me with very bad news.

They said it has a leak on the right side by the fuel pump, they said they can replace the fuel tank but between the parts, labor and taxes, it comes out to just a little bit over 4.2k i cant afford that right now.

My car isnt running strange or anything, but im guessing my fuel economy has dropped and i can probably be potentially dangerous if there's some type of spark near that small leak.

I asked them if it could be sealed and he said yes but not there since they cant guarantee their work.

The hard part is that leak isnt on the bottom of the tank where i can just get under and seal the tank, like i said its on the right side. So im guessing im stuck bringing it down and finding the leak to seal it up.

If any of you guys could give me a walk-through on how to do this, and what kind of sealant would you use, i would seriously appreciate it. i really am in a bind...

[amz]

My car isnt running strange or anything, but im guessing my fuel economy has dropped and i can probably be potentially dangerous if there's some type of spark near that small leak.[/B]

Or a drop finds its way to your exhaust after it's nice at hot.

Find an indie shop that guarantees their work for a year and get it repaired there. That way, if the issue comes back because they didn't do the work properly you can bring it back to them. Also, if the worst does happen, you can tell your insurance company you had a certified mechanic do the work, which might make a claim easy (no idea how insurance works in Florida.)

[autobahnaudi]

The fuel pump is right under the rear passenger seat. So a shop that is williling to seal it shouldn't have much trouble getting to the location of leak and sealing it.

[dfm990]

Do you guys have a rough idea on how much it would be to just have them lower and seal the tank?


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[bluetori]

So I'm guessing your car is not a CPO?

[Fburg A4]

sounds like a jb weld special

[dfm990]

So I'm guessing your car is not a CPO?

No

[dfm990]

sounds like a jb weld special

i would do it but i cant reach it with out taking out the tank...
im just worried how much it would be to have a mechanic just seal it for me

[Ajp428]

how many miles do you have on that car?

[dfm990]

how many miles do you have on that car?

39000

[autobahnaudi]

Engine and gearbox jack -V.A.G 1383 A-
Removing
– Observe safety precautions → Chapter.
– Observe rules for cleanliness → Chapter.
Caution
To prevent irreparable damage to the electronic components when disconnecting the battery:
Observe notes on procedure for disconnecting the battery.

– Disconnect battery → Electrical system; Rep. gr.27.
WARNING
Risk of accident caused by weight of fuel tank
Fuel tank must be empty when it is removed.

– Drain fuel tank → Chapter.

– Remove rear seat bench → Rep. gr.72.
– Unscrew cover for flange -arrows-.

– Unplug electrical connector -1- on flange.
– If fitted, unplug electrical connector -2- for metering pump for auxiliary heater on flange.

– Open tank flap.
– Clean area around fuel filler neck.
– Remove filler cap -arrow- from fuel filler neck.

Note
Seal off opening of fuel filler neck with a piece of clean foam to prevent dirt from dropping into the tank.

– Remove rear right wheel → Rep. gr.44.
– Remove rear right wheel housing liner → Rep. gr.66.
– Remove bolts -1- and -2- for fuel filler neck.
– Remove rear section of exhaust system → Rep. gr.26.
WARNING
The vehicle can tip over on the lifting platform when the rear axle is removed.
BEFORE loosening the subframe bolts, take steps to ensure that the vehicle does not tip forwards on the lifting platform (e.g. put a weight of about 50 kg in the luggage compartment).

– Remove rear axle → Rep. gr.42.


WARNING
Risk of injury - fuel system operates under high pressure.
To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection.

– Press release tab and disconnect fuel line -1- at front of fuel tank (right-side).
– If fitted, disconnect fuel line leading to auxiliary heater and unplug electrical connector at metering pump.

– Disconnect breather line -1- on left of activated charcoal filter (press release tab).

– Position engine and gearbox jack -V.A.G 1383 A- below vehicle to support tank.
– Support fuel tank using engine and gearbox jack -V.A.G 1383 A-.


WARNING
Risk of accident caused by weight of fuel tank
Fuel tank must be empty when it is removed.


– Remove bolts -1 ... 4- and detach bracket -5- for exhaust system.
– Then lower fuel tank using engine and gearbox jack -V.A.G 1383 A-, simultaneously guiding fuel tank down by hand.
Installing
l Tightening torque → Chapter
Installation is carried out in the reverse order; note the following:
– Check that fuel lines are clipped onto fuel tank.

– Position fuel tank and securing straps on underbody using engine and gearbox jack -V.A.G 1383 A-.
– When installing fuel tank, make sure that fuel filler neck is correctly inserted into opening on body.
– Attach bracket -5- for exhaust system and tighten securing strap bolts -1 ... 4-.

– Connections -1- and -2- on filler neck must be free of corrosion to ensure proper earth connection to body.
– Tighten bolts -1- and -2- for fuel filler neck.
WARNING
Risk of explosion caused by electrostatic discharge.
After installation, use an ohmmeter to check the electrical connection between the metal ring on the fuel filler neck and a bare metal part on the body:
Specification: approx. 0 Ω

– Install rear axle → Rep. gr.42.
– Install rear section of exhaust system → Rep. gr.26.
– Install rear right wheel housing liner → Rep. gr.66.
– Fit rear wheel → Rep. gr.44.
– Install cover for flange → Fig..
– Install rear seat bench → Rep. gr.72.
– Connect battery (observe notes on procedure for connecting the battery → Electrical system; Rep. gr.27).
– Vehicles with auxiliary heater: Bleed fuel supply line leading to metering pump → Chapter.



Sorry for your situation. Unfortunately the removal of the gas tank is very labor intensive. If it wasn't for the removal of the rear axle maybe not so much but it has to be taken out as per the manual.
You maybe to able to access the right side of the fuel tank (the area you need) via the rear fender if you remove the fender well liner.