Just the one pump. You might have some fuel flow from that hose if the level in the tank is really high. Last time I did a Diesel Purge nothing came from the supply hose, but you might want to have something handy to plug it just in case.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References