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Your experience with 122 tanks differs from mine ('63 4-door, '67 2-door and
2 '66 wagons)
Mine all had a baffle around the fuel level sender, a box about 6" square going
almost to the bottom of the tank.
NONE of mine had metric fittings - all were inch-size pipe or tubing fittings.
The metal fuel line was 5/16" which is mighty close to 8mm.
Leakage at the short hose that connects the filler neck to the tank stub was
a problem if the hose dried out from the tank being too near empty for too
long. It would drip for a day or so after filling, until the gasoline caused
the rubber to swell.
Diesel is hard on the skin but is not caustic (alkaline). True caustics
include lye, caustic potash, washing soda (sodium carbonate) and other ionic
compounds with a high pH.
The reason diesel works better is that it is more viscous (thicker) - carries solids around better.
I agree with you 100% on blowing back down the line and also a radiator shop
to clean the tank (if you can find one that will do it - most of those guys
have either retired or are planning to!).
--
George Downs Bartlesville, Heart of the USA!
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