Mercury Carburetor Fuel Pump Cover Gasket 27-16274
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Mercury Carburetor Fuel Pump Cover Gasket 27-16274
Part Number: 27-16274 (short ref: 16274)
Brand: Mercury / Quicksilver
Product Type: Carburetor Fuel Pump Cover Gasket (OEM)
System: Outboard Fuel System / Carburetor
Position: Beneath fuel pump cover 16272, adjacent to diaphragm 16275
Quantity Required: 1 per carburetor
GTIN / UPC: 745061117587
Approximate Weight: 5 g
What This Part Does
The 27-16274 is a genuine OEM gasket that seals the fuel pump cover to the carburetor pump body on selected small Mercury and Mariner 2-stroke outboards. It sits directly beneath fuel pump cover 16272 and works alongside the pump diaphragms to maintain the integrity of the carburetor fuel pump section. This is the pump cover gasket, not the pump body gasket or float bowl seal — see the Serial Number Notice below for part number callouts of adjacent seals.
Compatible Applications
Confirm your engine horsepower, serial number, and carburetor diagram before ordering. Mercury used several carburetor versions across these horsepower ranges — the 16274 gasket position is the pump cover, not a universal carburetor gasket.
- Mercury / Mariner 4 HP 2-stroke
- Mercury / Mariner 5 HP 2-stroke (multiple serial ranges)
- Mercury / Mariner 6 HP 2-stroke
- Mercury / Mariner 8 HP 2-stroke
- Mercury / Mariner 8 HP SeaPro 2-stroke
- Mercury / Mariner 9.8 HP 2-stroke
- Mercury / Mariner 9.9 HP 2-stroke
Serial Number Notice
Several gaskets and seals are stacked closely together in the carburetor fuel pump section. Do not order by appearance alone — confirm against the Mercury carburetor diagram for your engine serial number. Do not confuse 27-16274 with:
- 16326 — Pump body gasket (different position in the same pump section)
- 16262 — Drain screw gasket
- 16327 — Carburetor mounting gasket
- 16259 — Float bowl O-ring
When to Replace
- Fuel pump cover is removed for any service (replace as standard practice)
- Fuel seepage visible around the pump cover area
- Gasket is torn, compressed, hardened, or distorted on inspection
- Fuel pump diaphragm is being replaced
- Carburetor overhaul reveals deterioration of the pump section sealing surfaces
Installation Notes
- Clean both the pump cover (16272) and carburetor body mating surfaces before installation
- Seat the gasket flat without wrinkles, tears, or misalignment
- Inspect adjacent pump components while the section is open: diaphragm 16275, diaphragm 16325, and pump body gasket 16326
- Do not reuse the old gasket after disassembly
- Check for fuel leaks around the pump cover after reassembly and before returning the engine to service
Part Number Cross-Reference
- Current OEM: 27-16274
- Short Reference: 16274
- Associated repair kit: 855546A1 (carburetor repair kit — includes 16274 as a component)
Parts Desk Insights
Best use case: Order 27-16274 any time the fuel pump cover comes off a 4–9.9 HP Mercury or Mariner 2-stroke carburetor — replacing the gasket during any pump diaphragm service or carburetor overhaul is the right approach since access is already there and the part is low cost.
Common issues: The most frequent mistake is confusing the pump cover gasket (16274) with the pump body gasket (16326) — they sit in adjacent positions in the same fuel pump section and look similar. Always match by Mercury diagram position and part number. A second common issue is reusing the old gasket after pump cover removal — a compressed gasket that appeared intact on the bench often leaks once reassembled and back under fuel pressure.
Related Parts
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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