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My question is why two fuel pumps plumbed in series? It doesn't seem to make any sense. (To me) I can understand that a mechanical fuel pump may not be able to deliver the required amount of fuel at WOT or approaching WOT. This would be the reason for having an electric fuel pump.
As for both in series. I see the mechanical fuel pump as an added restriction to fuel flow. (My opinion)
Lew
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I also drive an Original '78 FJ40.
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