Re: 1929 packard 626 fuel tank sending unit
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Home away from home
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Not sure of the best way, but I needed to repair mine (seehttps://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=6514&forum=10. Before I replaced the broken tubes, I very lightly sandblasted the unit and then soaked it in a weak phosphoric acid solution (Krud Kutter) for half an hour to remove any scale that might be on the inside of the tubes. Then after finishing the repair, I flushed everything with hot water and blew it dry with compressed air.
Posted on: 2011/6/24 17:23
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Re: 1929 packard 626 fuel tank sending unit
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Home away from home
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I just did the unit on my 733. I cleaned all the organic crud using lacquer thinner. I let the thinner evaporate and then soaked it in 5% muriatic acid (HCL). I would let it soak for a few minutes, try to scrub off the lime with a tooth brush, let is soak a little longer, scrub, and repeat until clean. Don't let it soak overnight or anything like that. You will find large chunks missing in the morning!
I cleaned out the inside of the tubes using pipe cleaners or small bits of rags dragged through with a very thin copper wire. Cheers, Tom
Posted on: 2011/6/24 21:37
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