Sierra Shields Low Permeation Marine Fuel Feed Hose - Available in 5/16" and 3/8" ID, 10' Polypac or 25' Carton

Sierra's Shields Series 368 Low Permeation Marine Fuel Feed Hose is built for boaters who need a fuel line that meets today's strict emissions standards without sacrificing durability. The hose uses a plastic barrier veneer bonded to an NBR outer layer tube, which blocks fuel vapor permeation far more effectively than standard rubber fuel hose. A polyester reinforcement layer gives the hose the strength to handle engine bay heat, fuel pressure, and constant exposure to weather and UV light without cracking or going soft.

This hose is designed primarily for fuel feed lines, and it is rated for gasoline (including blends up to 85% ethanol), diesel, and all bio-diesel blends, making it a safe choice across gas and diesel-powered boats. It meets USCG Type A1-15 requirements for pleasure boats, along with SAE J1527 Type A1-15, ISO 7840 Type A1, and NMMA/CE Type accepted standards, so it satisfies both regulatory and insurance requirements for fuel system work. Operating temperature range is -20 degrees F to 212 degrees F, covering everything from cold winter storage to hot engine compartments.

This line is sold in two inner diameters, 5/16" and 3/8", so it fits a wide range of fuel feed line applications from smaller outboard fuel systems to larger stern drive and inboard feed runs. Each size is available in a 10 foot Polypac or a 25 foot reel-off carton, so you can buy just enough for a single hose replacement or stock up for larger jobs and future repairs.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 16-368
• Product Type: Low Permeation Marine Fuel Feed Hose
• Available Inner Diameters: 5/16" (7.9 mm), 3/8" (9.5 mm)
• Outside Diameter (5/16" ID): 5/8" (15.49 mm)
• Outside Diameter (3/8" ID): 11/16" (17.27 mm)
• Available Lengths: 10 foot Polypac, 25 foot reel-off carton
• Maximum Working Pressure: 100 psi
• Temperature Range: -20 degrees F to 212 degrees F
• Material: Polyester reinforced hose with NBR outer layer tube and plastic barrier veneer
• Color: Black
• Fuel Compatibility: Gasoline (up to 85% ethanol blends), diesel, all bio-diesel blends
• Certifications: USCG Type A1-15, SAE J1527 Type A1-15, ISO 7840 Type A1, NMMA/CE Type accepted

Sizes & Options

Choose your inner diameter first (5/16" or 3/8") to match the fuel line you are replacing or the fitting size on your fuel system components, then choose your length. The 10 foot Polypac is suited to single hose repairs, while the 25 foot reel-off carton is a better value for longer runs or when replacing multiple fuel lines at once.

Frequently Asked Questions

What sizes does the Sierra Shields 16-368 fuel feed hose come in? The Sierra Shields 16-368 low permeation fuel feed hose is available in 5/16" inner diameter and 3/8" inner diameter, each offered in a 10 foot Polypac or a 25 foot reel-off carton.

Is this hose rated for ethanol fuel? Yes, the 16-368 fuel feed hose is rated for gasoline blends up to 85% ethanol, along with diesel and all bio-diesel blends.

What is the difference between the 5/16" and 3/8" versions? The two sizes differ in inner and outer diameter: the 5/16" hose has a 5/8" outside diameter, while the 3/8" hose has an 11/16" outside diameter. Pick the size that matches the diameter of the fuel line you are replacing.

What is the maximum working pressure of this hose? The Sierra Shields 16-368 fuel feed hose has a maximum working pressure of 100 psi.

What temperature range can this hose handle? This hose is rated from -20 degrees F to 212 degrees F, so it holds up in both cold winter storage and hot engine compartments.

Does this hose meet USCG requirements for pleasure boats? Yes, the 16-368 hose meets USCG Type A1-15 requirements for pleasure boats, as well as SAE J1527 Type A1-15, ISO 7840 Type A1, and NMMA/CE Type accepted standards.

What is this hose made of? It is a polyester reinforced hose with an NBR outer layer tube and a plastic barrier veneer that reduces fuel vapor permeation compared to standard rubber fuel hose.

Should I buy the 10 foot Polypac or the 25 foot carton? The 10 foot Polypac is sized for a single fuel hose repair, while the 25 foot reel-off carton is a better choice for longer fuel line runs or if you plan to replace more than one line.

Can this hose be used with diesel fuel? Yes, the Sierra Shields 16-368 fuel feed hose is rated for diesel and all bio-diesel blends in addition to gasoline.

Is this hose UV and weather resistant? Yes, the low permeation construction of the 16-368 hose is weather and UV resistant, in addition to meeting EPA and CARB very low permeation requirements.