Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 81Get this manual
FUEL PUMPINTREGAL FUEL TANK
Fuel Pump Removal and Installation
REMOVAL 1Remove the fuel hoses from the fuel pump2Remove the two mounting screws and remove the fuel pumpINSTALLATION 1Place O-ring seal on the back side of the fuel pump and install the pumpTighten screws to the specified torque2Reconnect the fuel hoses and secure fuel hoses with hose clampsFuel Pump Mounting Screws 70 lb-in(8 Nm)