YSIL Fuel Line Hose 5/32" (4mm) ID — 10ft NBR Rubber, 300 PSI Rated Flexible Push-Lock

This 10-foot fuel hose from YSIL combines nitrile butadiene rubber (NBR) with braided fiber reinforcement to deliver a resilient, flexible line suited for fuel systems, coolant return lines, and steam emission applications in automotive and light-commercial vehicles. With a 4mm (5/32") inner diameter and a 10mm outer diameter, the hose balances compact routing with dependable flow. It accepts hose-barb fittings and clamps for secure push-lock connections and can be trimmed to length for custom installations.

How tough is this hose under heat and pressure?

The YSIL NBR construction resists fuels and oils while tolerating a wide temperature span, and its braided fiber core raises burst strength. Rated for a continuous working pressure of 217 psi and a maximum working pressure of 300 psi, the hose offers a safety margin up to a 1200 psi burst pressure in testing conditions. Use within the recommended -40°F to 257°F (-40°C to 125°C) temperature window for long service life.

• Working pressure: 217 psi (typical)
• Max working pressure: 300 psi
• Burst pressure: 1200 psi
• Temperature range: -40°F to 257°F (-40°C to 125°C)

Will this hose fit my vehicle’s fuel or coolant lines?

Measure the inside diameter of the hose port you plan to connect; this product has a 5/32" (4mm) ID and a 2/5" (10mm) OD, which suits small-bore fuel and vent lines on many cars, trucks, motorcycles, and marine engines. It’s intended for push-on hose-barb fittings and secured with standard fuel line clamps. If your application needs a larger flow rate, choose a hose with a bigger ID.

• Inner diameter: 5/32" (4mm)
• Outer diameter: 2/5" (10mm)
• Length: 10 feet — cuttable to size
• Recommended: hose barbs and fuel clamps for installation

How easy is installation and maintenance?

The hose’s flexibility and bendability simplify routing through tight engine bays and vehicle chassis. It can be cut cleanly with a utility knife or hose cutter, then pushed onto barbed fittings and secured with clamps to create a leak-free connection. Inspect fittings periodically for wear and replace clamps if they show corrosion or looseness.

• Flexible, easy to route around bends
• Cut-to-length friendly — use sharp cutter
• Push-lock compatible with hose barbs and clamps
• Periodic inspection recommended for safety

What fluids and systems is this hose suitable for?

Designed primarily for fuel systems and related engine applications, the NBR compound provides chemical resistance to gasoline, diesel, oil and similar hydrocarbons. It also works well for coolant return lines and low-pressure steam emission paths where temperature and flexibility are required. Avoid prolonged exposure to incompatible solvents or concentrated chemicals not listed by the manufacturer.

• Compatible: gasoline, diesel, engine oil, coolant return
• Applications: fuel lines, vent/return hoses, steam emission
• Not recommended for: high-pressure hydraulic systems
• Store away from ozone and direct sunlight to prolong life

Who is this for: Mechanics, hobbyists, fleet maintenance crews and vehicle DIYers who need a compact, durable fuel line for small-bore routing will find this YSIL 4mm ID hose useful. It’s suited for repairs, custom plumbing, and replacement lines where temperature resilience, pressure rating and flexibility matter. Choose this hose when you need a reliable, cut-to-size solution that works with standard barbed fittings and clamps.