| Finding fuel tank leaks. [message #369990] |
Mon, 20 June 2022 21:41  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
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I had a leak in one of the two tanks. I could smell it but the only time it would drip is when I’d fill full. So I dropped both tanks. Each tank has two vents. A vent nipple on the top of th tank and a vent the sending unit. I found the first obvious leak at the reserve tank vent where the hose slipped off of the reserve tank vent nipple. So I then plugged all access points on the tanks and pressurized the tanks. Then took soapy water to every connection. The next leak I found was at the main tank. There was a pin hole leak where the vent nipple is soldered to the tank. Cleaned it up and applied JB weld. Finally, I have in-tank pumps and found leaks around where the vent comes out of both sending unit vents. Cleaned up and JB welded it. While it was apart I replaced the fuel pump strainers, (AKA “socks”) and sent the tanks out for cleaning. I know most people think that dropping tanks is a difficult job. But even with the extra wiring and steel line connections, the whole dropping thing, start, to tanks on my work bench took about 1 1/2 hrs. Spent most of the time waiting while pumps drained the tanks into waiting 5gal gas cans. The most interesting thing about draining the tanks was, after pumping the tanks dry, and the tanks were out, I tipped the tanks on their side and poured out the excess fuel that the pumps would not take. Total fuel remaining in both tanks when pumped “dry” was only 1qt. Yes, your read that right....1 qt. Amazing…thought it would be more than that. Waiting now for my tanks to come back from Irvington Garage. JWID
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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