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The tank in my '73 911 started to rust badly on the inside, and released chunks that got past my fuel filter and clogged the idle jets.
I recently the gas tank done by the Gas Tank Renu process. From what I gathered, they put the tank in an oven and burned off the outside coating. Then they sandblasted the tank inside and out, applied a PVC coating to the inside using kind of a rotational molding movement, and then brushed on a PVC coating on the outside. Cost was around $125 plus shipping both ways. Caution: UPS shipping can be very expensive depnding on how you box up the tank (the size box required puts it into the multiplier of the weight charge).
My criticisms:
Nothing was done to stop or slow the rust in the seam around the edge of the tank, so how long it will hold together is anybodies guess.The PVC coating inside the tank is very thin, there was a plastic "hat" inside the tank that is gone now, and the exterior of the tank looks like it was done by a 4 year old with bad hand to eye coordination. The guarantee applies to only the tank and not any of the connecting tubes, which were painted with just a primer nad started to rust in a month.
In retrospect, cleaning the tank using the electolisys method described here and strippng the exterior with an angle grinder and a cup brush doesn't sound too bad. I'd probably use the Por 15 tank coating on the inside.
Also, I heard that repro tanks wouldn't be available for another 6 months. Given my experience with the importer, I'd add another 6 months to that estimate.
YMMV.
Jim
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