That's most likely leaking plastic fuel lines. If you have small hands, you can replace all but one of them without removing the intake manifold. Simply remove the nut that holds down the washer bottle, lift it up and set it aside. Then you can reach in and get to the fuel lines. I'll post a diagram later today along with part numbers. If the shutoff solenoid (black box) is leaking, then you'll see fuel dripping down underneath it while the engine is running. It wouldn't make a mess on top of the pump.

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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