2PCS 3/8" 10mm Non Return One Way Fuel Line Check Valve, Aluminium Alloy Car One-Way Inline Fuel Hose Check Valve for Fuel Line Petrol Diesel Fuel Oil Water (3/8" 10mm)

Leave a mower or a trail bike standing for a few weeks and the fuel drains back down the line into the tank. The next start is all cranking and no fire while the carburettor refills. A one-way valve spliced into the line stops the drain-back happening at all.

Holds the line primed while the engine sits

The valve cracks open at 0.2 bar (2.9 psi) — light enough that a gravity feed or a low-pressure lift pump pushes through without a noticeable restriction. The moment flow stops it shuts, and the column of fuel above it stays put. The supplier's working range runs 0.2–6 bar (2.9–87 psi), with a working temperature of −30 °C to 130 °C, so a summer engine bay and a frosty high-country start both sit inside it.

Anodised alloy rather than a plated finish

Each body is aluminium alloy with an anodised surface. Anodising grows an oxide layer into the metal instead of laying a coating over the top, so there is nothing to chip loose and travel down the line into a carburettor jet. The alloy keeps the fitting light too, which matters when it hangs mid-hose on nothing but two clamps.

Key features

• Pack of two: one for the machine, one for the spares tin.
• Cast flow arrow: direction is marked on the body, so there is no guessing which way round it goes.
• Low cracking pressure: opens at 0.2 bar, so gravity-fed tanks still flow properly.
• Fluids the supplier states: water, petrol, diesel and oil — methanol is specifically excluded.

Specifications

• Quantity: 2 valves
• Size: stated by the supplier as 10 mm / 3/8 in
• Material: aluminium alloy, anodised
• Opening (cracking) pressure: 0.2 bar (2.9 psi)
• Working pressure range: 0.2–6 bar (2.9–87 psi)
• Working temperature: −30 °C to 130 °C
• Hose clamps: not stated as included

Before you fit this valve

• Fit it with the arrow pointing the way the fuel travels. Reversed, it simply blocks the line.
• The 6 bar ceiling sits well below the pressures a modern EFI system runs at — check what your fuel system actually operates at before splicing one in.
• Clamp both ends. The supplier recommends hose clamps and does not state that any are supplied.
• Work on a cold engine, outdoors or somewhere well ventilated, away from ignition sources, and don't smoke. Petrol vapour is heavier than air and pools around your feet.
• Catch whatever drains out in a container rather than letting it run onto hot metal, then check the joints for weeps before starting up.
• Not suitable for methanol, per the supplier.

Suits cars, boats, motorcycles, mowers and other small engines that sit between uses.

Returns, Refunds and Replacements

Products that are received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with the Australian Consumer Law (ACL). We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. However, please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.

Delivery Timeframe

Please note that we cannot guarantee the exact date of arrival, and the delivery timeframes (excluding weekends and public holidays) are as follows:

For customers in Victoria, approximately 7-10 working days; For customers in NSW, SA, ACT, and QLD, approximately 9-12 working days; For customers in WA, NT, and TAS, approximately 9-12 working days.