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10 Now that our custom EFI fuel tank is in place, we needed a way to fill it with fuel. We were planning to simply bolt in the stock Mustang filler neck and maybe a billet fuel cap. All that changed when we stumbled upon Mustalgia's Le Mans fuel filler kit. The kit's installation starts with the fuel filler base plate, which screws to the taillight panel in place of the stock filler neck.