Why Bother.
Swap the "fuel delivery" and "return" lines in the engine bay and draw fuel from the "return" line and return fuel to the tank in the "fuel delivery" line. Any contaminants in the tank which are picked up will be deposited in the prefilter. The "return" line goes to the bottom of the fuel tank (in the sedan at least).
Assuming the same design brief for the designers of both fuel tanks, the wagon should go there too.
My wife's car has been running in this configuration for 12 months now, since it has a "one-way" issue in the fuel lines. - Fuel will go into the tank from the "fuel delivery" line, but not from the tank in that line. I even replaced the fuel tank, with no resolution of the problem. Remove the flex hose from the strainer and fuel flows freely, no dings in the metal fuel line, just one-way flow. Swap delivery & return, NO PROBLEM.

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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.