Mercury MerCruiser Fuel Cooler Quad Ring Seal – 26-8M0214975

The Mercury MerCruiser Quicksilver 26-8M0214975 is a genuine Mercury Marine OEM fuel cooler quad ring seal used in select Mercury and MerCruiser fuel cooler assemblies. This seal is used where the factory fuel-system diagram calls for 8M0214975 or the earlier 26-863151 / 863151 reference. It helps maintain a sealed interface inside the fuel cooler module so fuel-system components can hold proper pressure without leakage at the service joint.

Key Features

• Genuine Mercury Marine factory OEM sealing component.
• Current service part number: 26-8M0214975.
• Short part number: 8M0214975.
• Earlier Mercury/MerCruiser reference: 26-863151 / 863151.
• Quad-ring style seal profile for fuel cooler module sealing locations.
• Used in select fuel cooler and fuel-system assemblies where specified by Mercury diagram.
• Helps seal pressurized fuel-system components during fuel cooler service.
• GTIN/UPC references associated with this part family include 745061491748 and 678633180811.

Engine Compatibility

Common application context includes select Mercury outboard and MerCruiser fuel-injected engine applications using a fuel cooler assembly that calls for this seal by part number.

Use this seal only where the Mercury/MerCruiser fuel cooler or fuel-system parts diagram specifically calls for 26-8M0214975, 8M0214975, 26-863151, or 863151.

Serial Number Fitment Notice

Confirm fitment by engine serial number, fuel cooler module design, and exact Mercury/MerCruiser fuel-system diagram before ordering. Mercury uses different O-rings, quad rings, gaskets, fuel cooler seals, and service kits across similar fuel-injected engines, so the seal should be matched by diagram location rather than appearance alone.

When This Part Needs Replacement

Replace this seal whenever the fuel cooler module is opened or the original seal is removed during service. It should also be replaced if there is fuel seepage, fuel smell near the cooler, pressure loss, hard starting after fuel-system service, a flattened seal profile, cracking, swelling, cuts, or visible damage. Fuel-system seals should not be reused once compressed or disturbed.

Installation Notes

Relieve fuel-system pressure before service and follow the Mercury service manual procedure for the exact engine. Clean the sealing groove and mating surfaces before installation, and inspect the fuel cooler body, cover, fittings, fasteners, hoses, and related seals while the assembly is apart. Do not substitute a generic O-ring, as the correct seal profile and material are important for fuel-system sealing. After reassembly, check carefully for leaks before returning the engine to service.

Alternate/Superseded Part Numbers

• 26-8M0214975 current Mercury/MerCruiser formatted service part number
• 8M0214975 current short part number
• 26-863151 earlier Mercury/MerCruiser reference
• 863151 earlier short part number

Parts Desk Insight

Fuel cooler seals are small, but they should be treated as one-time service seals. A flattened or reused seal can allow fuel seepage or pressure loss after reassembly, so replacing the quad ring during fuel cooler service helps avoid repeat teardown and fuel-system leak concerns.

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