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Porsche transitioned from a fender mounted pump to an under tank pump in 78. The early 928's that were manufactured for destination to hotter climates were equipped with a second in tank pump. The factory pumps did have the long neck which contained the internal check valve. The aftermarket Pierburg doesn't have the internal check valve but the 6.5 bar unit that I bought includes an external check valve and all of the required fittings.
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Dennis
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