How to Assemble a Non-VRO Pump

Non-VRO, or variable-ratio oiling, pumps are fuel pumps used in boats that employ a premixture of oil and fuel. People may choose to replace an old VRO-style pump with a non-VRO version, also known as a "no oil" pump. Additionally, installing a non-VRO pump usually involves fewer connections, making the process simpler. You need the correct hardware to assemble a non-VRO pump kit.

Things You'll Need

  • Ratchet and socket set
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Instructions

    • 1

      Locate the pump body face. Find the new diaphragm supplied with the fuel pump kit. Center the diaphragm over the face of the pump body.

    • 2

      Align the fuel pump cover over the pump body face. Align the compression spring over the diaphragm gasket. Twist the diaphragm 90 degrees to lock the assembly in place.

    • 3

      Place the new reed valve into the small gap between the pump body cover plate. Thread the two pump cover bolts through the pump cover plate and tighten with the ratchet and socket set.

    • 4

      Align the filter with the main screw. Place the new gasket on so that it surrounds the filter.

    • 5

      Tighten the center-mount retaining bolt. Tighten the remaining four or six bolts on the cover in a crisscross manner, using the ratchet and appropriate-sized socket.