Our stock fuel pump for 50cc-150cc QMB139 / GY6 go-kart and scooter engines features two brass and one aluminum hose connectors. The low-pressure mechanical fuel pump is mounted outside the fuel tank, and transfers fuel from the tank to the engine. This 3-piece part comes with the pump, the fuel filter, and hose as pictured.
Filter isn’t even aligned on the tray that goes underneath it. Fuel pump itself is about 2x smaller than the OEM, even though this site says it will fit. Also the fuel is not going into the pump, and it’s not due to the carb or vac lines.