Leaking FUEL TANK

Started by kartone, May 21, 2014, 06:27:25 PM

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brook308

Some pics of the spare tank.

brook308

More pics, some surface rust in the bottom of the tank, some surface rust in patches on the out side of the tank. The outside would clean up with a wire brush in places and a respray.
The inside I would assume is like any 30 year old fuel tank. Not sure how you would clean the inside.
Maybe a chemical treatment of some sort.
The tank is very straight, most of the tanks I've had or seen have some sort of damage from bottoming out or some idiot trying to jack the car via the tank.




kartone

Thanks brook308, as is my tank is in better condition, no rust or dents whatsoever.
The tank is now baking at 185C for 4.5 hours to remove the Red-Kote liner, after that I will solder the crack and solder stiffening sheet-metal angles on the bottom outside of the tank, followed by a complete reline with Red-Kote.   
82 GTV6 split-dash
80 Alfetta GTV

VeeSix

There you go, a member has even jumped up and offered you one, grab it, wash it in and out with wash and wax car wash, dry it out it, pour a litre or two of petrol in there to get out any rust flakes and use, you are back on the road with no leaks, do not worry about putting any interior linings in it, they will just end up in trouble in the long run, back on the road you have time to source a good tank

To be honest those under car GTV tanks just seem to trouble prone, sometimes I think they were a bad design, but as we know fuel has a heating up and cooling down cycle, maybe the problems come from a breather system going bad and the tank can not handle the rising and contracting cycle and just eventually splits, definantly not a tough tank, talking from experience here, I have been thru quite a few of these tanks

Even though you lose some boot space I think the best fuel tank is the GTV6 and 75 V6 3.0 boot mounted tank, never had a problem with any of them, plus unlike the 90 and 75 under car tank you get a gravity flow to the main fuel pump which cuts out the in tank pump which cuts out a problem if any should arise, you can definantly count out a in tank pump when you do not have one  ;)
1985 Alfa Romeo GTV6 V6 2.5 12V 
1986 Alfa Romeo 90 V6 2.5 12V
1990 Alfa Romeo 75 V6 3.0 12V Potenziata
1990 Alfa Romeo 164 V6 3.0 12V Zender
1991 Alfa Romeo 164 V6 3.0 12V QV
1992 Alfa Romeo 164 V6 3.0 12V QV

kartone

The tank has been cooked twice at 185C, as can be seen most of the RedKote has turned to black ash, the whitish finish is the original lining of the tank; one more round in the oven and a scrub with two hand-full of chain will do it. The external photo of the tank shows the hairline crack on the stiffening crease.
The intention is mig weld the crack and tack mig weld a 30x30 angle upside-down on top of all crease, notched at intersections, to provide extra stiffness 
82 GTV6 split-dash
80 Alfetta GTV

kartone

return of the tank II
82 GTV6 split-dash
80 Alfetta GTV

kartone

return of the tank III
82 GTV6 split-dash
80 Alfetta GTV

GTVeloce

Can I suggest that when you are done with the tank, make sure you check the vapour system is working well? I replaced all the hosing and checked the operation of the breather valve.

I also pulled out the brass tube that enters the black plastic device and it was blocked. Some petrol and thin wire and it came good.

If the system isn't functioning properly then you can get petrol smells or worse, a pressure build up that might damage the tank again!