Sierra Marine Fuel Lines: Universal, Mercury & Yamaha Connections

Sierra eight-foot primer-bulb fuel-line assemblies come with different hose and connection arrangements. The universal 5/16-inch line is not the same as either 3/8-inch Mercury or Yamaha application line. Check the original engine connector, tank connection and fuel-system requirements before ordering a replacement.

Choose the hose and connector family

Universal 5/16-inch 18-8013EP-2 · 8 ft (2.4 m) · 5/16 in (7.9 mm). Separate end fittings needed.Compare this product
Mercury / Mariner 3/8-inch 18-8016EP-2 · 8 ft (2.4 m) · 3/8 in (9.5 mm). Double-sealed tank-side connection, clip-on engine end; separate tank adaptor may be needed.Compare this product
Yamaha 3/8-inch 18-8017EP-2 · 8 ft (2.4 m) · 3/8 in (9.5 mm). Sierra 18-8076 fuel-line connectors; separate tank adaptor may be needed.Compare this product

Simple hose identification symbols, not a dimensional product or connector diagram. Refer to the matching product photographs and original connectors.

Tank connectors are not all included. Sierra identifies a separate tank adaptor for the Mercury- and Yamaha-oriented assemblies and does not supply end fittings with the universal 5/16-inch hose. Check included parts for the exact MPN rather than treating an eight-foot hose as a complete engine-to-tank kit.

Sierra fuel-line part-number comparison

Sierra MPN Purpose Hose ID Length Fittings
18-8013EP-2 Universal / fittings required 5/16 in (7.9 mm) 8 ft (2.4 m) Separate end fittings needed
18-8016EP-2 Selected Mercury/Mariner applications 3/8 in (9.5 mm) 8 ft (2.4 m) Double-sealed tank-side connection, clip-on engine end; separate tank adaptor may be needed
18-8017EP-2 Selected Yamaha applications 3/8 in (9.5 mm) 8 ft (2.4 m) Sierra 18-8076 fuel-line connectors; separate tank adaptor may be needed

Sierra lists premium fuel hose with polyester-braid reinforcement, a CPE outer cover and flexible THV barrier layer. Confirm fuel-system compatibility and exact connector geometry independently.

Five checks before buying an outboard fuel line

  1. Find the old Sierra or engine OE number where possible. A brand name or horsepower range alone is not enough to establish fit.
  2. Measure hose inner diameter: 5/16 inch (18-8013EP-2) versus 3/8 inch (18-8016EP-2 and 18-8017EP-2).
  3. Compare the quick-connect geometry on both engine and tank sides. Sierra lists different connectors for Mercury and Yamaha applications.
  4. Identify any tank adaptor sold separately, and confirm that all clips and seals are present and in good condition.
  5. Follow marine fuel-system requirements, inspect for leaks and replace damaged hoses or fittings before operating the boat.

View the three Sierra outboard fuel-line options

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