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Join Date: Nov 2006
Location: Conway,AR
Posts: 1,579
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Cleaning a gas tank
I have a recently acquired 67 912. The car ahs been setting for many years (since 1979). It had about 10 gallons of gas in the tank. The inside of the tank looks pretty bad. IS there a way to clean these tanks? How about a radiator shop? Any suggestions would be appreciated. Thanks.
Tom |
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11-13-2007, 08:21 AM
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Join Date: Apr 2007
Location: W.Sacramento
Posts: 305
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Cleaning Tank
Tom-
Radiator shop is the best bet. I'm in the same boat with a 1976 911S Targa. Sat for 6 years. Based on a phone call yesterday to my local radiator shop it's $70 to clean and another $60 to line. I'd suggest both. |
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11-13-2007, 08:52 AM
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Location: Houston (The Vintage), Texas
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Get the gas out of there by taking the gas line off of the bottom of the tank. Kinda hard to get to on the early cars, it's in a really tight spot. Use a 5 gallon bucket to catch the old gas. Please do this outside though. When I got my tank redone the smell was horrible, and the fumes lingered in my garage for weeks. When the tank is completely empty take it to a radiator shop to have cleaned out. Ask them to coat the inside with POR-15, and to sandblast the outside. Put some primer on the outside of the tank and voila, brand new gas tank.
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-Tom '73 911T MFI - in process of being restored '73 911T MFI - bare bones '87 924S - Keep's the Porsche DNA in my system while the 911 is down. aka "Wolf boy" |
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11-13-2007, 09:02 AM
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Original Owner
Join Date: Dec 2002
Location: San Antonio, Texas
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tsuter 78 911SC Turbo Targa Thaaaats Right!! |
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11-13-2007, 09:10 AM
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Location: Bethesda, MD
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Tom, I had a '67 912 myself and ran into the exact same problem. I used an industrial steam cleaner at a friend's towing shop, and never had another problem. Good luck!
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-Andy '67 912, '92 C2, and '93 RSA - all gone 
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11-13-2007, 09:19 AM
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Location: Houston (The Vintage), Texas
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P.S, if your going to clean the tank you might as well go ahead and replace all of the fuel lines. The fuel lines have all of that bad fuel in it, and you don't want to be running that through your engine. Plus it can be highly dangerous since the fuel lines become brittle after years.
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-Tom '73 911T MFI - in process of being restored '73 911T MFI - bare bones '87 924S - Keep's the Porsche DNA in my system while the 911 is down. aka "Wolf boy" |
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11-13-2007, 09:20 AM
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Join Date: Feb 2001
Location: South of the Mason-Dixon Line
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Been their done that....
I had the same issues with my 1975.5T tank, which is very unique in that it had interior baffeling and feeder lines for the first CIS. With that ocncern over clogging small orifices, I asked the same question on this board. What I did, which is still trouble free after two years, was to drain the gas (syphon first then flip and empty and remove anything that screwed on I could. I took the tank to a local reputable radiator shop in Atlanta (Simms). They assured me that the tank could be boiled in a caustic hot solution and then coated in the inside twice with REDKOTE. Redkote is used by the military as an internal coating in fuel and oil tanks, especially onboard Navy vessels. Everyone here was pushing for POR coating kits made just for tanks, but I figured for the $150.00, I would leave it to the experts. The tank came back with a small welded patch where they opened up a hole for better draining, but the exterior of the tank needed priming and coating. Here is where I used POR 15 exterior coating to seal the outside then Gray rubberized exterior coating to bring it back to its original appearance. You have several options including the purchase of a new tank for $250 on the market today that will still require some outside finishing. Their are tank refinishers that even split the tank in two, sand blast, coat and re-weld giving you essentially a new tank! I would look at all options and determine what is the most cost effective cure for your budget. Bob 1973.5T Sepia of course 
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11-13-2007, 09:37 AM
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Location: Bethesda, MD
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OH, the other big thing... on '67 there's a nut on the back of tank where the fuel line connects, on the other side of that nut is the pickup which had a metal mesh screen, REPLACE THE WHOLE THING!!! There's not point in doing anything if you don't.
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-Andy '67 912, '92 C2, and '93 RSA - all gone
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11-13-2007, 09:45 AM
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Join Date: Oct 2002
Location: Charlottesville, VA
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What about the plastic bulb in the bottom center where the drain plug and screen appear to go? How does that thing get cleaned out?
Also, does somebody know how the outlet plumbing and return pressure plumbing work? Where is the gas actually picked up by the outlet pipe, and how does gas get put through the screen attached to the drain plug? Thanks....
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Fax 1983 Porsche 911SC |
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12-16-2007, 09:39 AM
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Location: Conway,AR
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Thanks for the great advice. I took the tank to a local radiator shop and they dipped the tank and coated the inside for $150. The outside had some surface rust that had formed since the tank was dipped, so I cleaned it up and painted it with self-etching primer. Does anyone have a suggestion about the covering to spray on to give it the factory look? Is it Body Schutz or ?. Thanks for the great advice.
Tom |
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12-19-2007, 09:13 PM
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