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At the fuel pump, a 90-degree fitting is installed to convert from the pump's NPT pipe-threads to a male AN while also aiming up at the carb. The pipe threads require some form of sealer, particularly since the fitting has to be indexed to face in the desired direction rather than bottomed out. We wrapped the pipe threads with Teflon tape, which is an acceptable practice, though many racers prefer liquid Teflon sealant (Permatex offers such a product), fearing that errant bits of the tape could wind up in the carb's needle-and-seat. To avoid this, we wrap the tape tightly a few threads back from the fitting's end. Do not use tape or sealer on the AN fittings.