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3/8" or 1/2" Oil Supply Line?
I'm replacing an old 330 gallon outdoor tank with a new 275 gallon tank.
The current fuel line comes off the tank with 3/8" bare copper fuel line, through about 14" of dirt (about 6-8" deep and then about 6-7 inches to wall) then through a hollow block wall, with hydraulic cement sealing the hole the line enters. The line runs along basement rafters, about 40' between tank and boiler with a Westwood cartridge filter installed. The boiler is a Weil-McLain Gold WTGO circa 1997-98 vintage.
I want to run plastic coated fuel line, ideally through some sort of conduit/plastic piping at the wall to protect it from the masonry and dirt, adding a vertical coil outside to allow for any expansion/movement.
I've read some recommendations to use a 1/2" line, but everywhere I look tank valves and Westwood fittings are all 3/8". For example standard fuel tank valves are 1/2" x 3/8" and I can only find old style bowl types with 1/2" fittings for industrial uses.
What is the advantage to using 1/2" line? Is it possible to find 1/2 x 1/2 valves and filter housings to use 1/2" lines? Or just stick with 3/8" as it necks down anyway?