MOTO4U 500ml Auxiliary Fuel Tank for Carburetors – Vented Portable Gas Tank with Shut-Off Valve, Hose & Clamps

MOTO4U's 500ml auxiliary fuel tank is a portable, vented fuel reservoir with a shut-off valve designed to feed carburetors and small engines during tuning and repair.

When you need steady, controllable fuel flow for carburetor adjustment, synchronization, or engine diagnostics without relying on the main tank, this compact MOTO4U unit provides a safe, straightforward solution. Built from chemical-resistant materials and supplied with fuel line, clamps, and a petcock, it helps you test and tune engines for motorcycles, lawn mowers, ATVs, and other small machines.

How does this auxiliary tank help me tune a carburetor?

The auxiliary tank supplies clean, uninterrupted fuel directly to the carburetor so you can make precise jet, idle, and air/fuel adjustments without the variables introduced by the main tank. Because it hangs nearby and has a built-in vent and cut-off valve, you control flow and can observe engine response immediately.

• Direct feed avoids fuel pickup issues during mains removal
• Cut-off valve lets you start/stop flow for quick checks
• Vented cap prevents siphoning and pressure imbalances
• Transparent 500ml capacity gives visible fuel level for testing

Is it compatible with my bike, mower, or other small engine?

This MOTO4U tank is built as a universal solution for most carbureted small engines. It ships with a 1/4" fuel line, two hose clamps, and an engine-side barb so you can fit it to a wide range of fuel inlet sizes and setups.

• Works with motorcycles, scooters, lawnmowers, generators, and ATVs
• 1/4" fuel hose fits many carburetor inlet fittings; clamps included
• Simple hand-fit or clamp mounting — no special adapters required in most cases
• Compact hanger design fits handlebars, frames, or bench vises

What safety and flow-control features are included?

Safety and control are addressed through a vented cap to balance pressure and a petcock-style shut-off valve to regulate or stop fuel flow instantly. The materials resist common fuels, reducing the risk of premature degradation or leaks during repeated use.

• Built-in air vent for steady, drip-free flow
• Petcock cut-off valve for immediate flow control and shutoff
• Chemical-resistant container minimizes fuel permeation and swelling
• Supplied hose clamps secure connections to prevent accidental disconnection

How do I use and mount the auxiliary tank during a service session?

Set the MOTO4U tank higher than the carburetor for gravity feed, hang it from handlebars or clamp to a vise, attach the fuel line to the carburetor inlet, and open the petcock to start flow. Use the valve to pause fuel delivery while making adjustments or swapping jets.

• Fill to a safe working level and secure the vented cap
• Hang using the molded hanger or clamp to a bench vise for stability
• Connect supplied 1/4" hose to carburetor and tighten included clamps
• Open petcock slowly to establish steady flow, adjust as needed

Who is this for? The MOTO4U 500ml auxiliary fuel tank is aimed at home mechanics, professional technicians, and enthusiasts who perform carburetor tuning, diagnostics, or small-engine repairs. It benefits anyone who needs a portable, reliable fuel source for testing and adjustment — from backyard DIYers servicing lawn equipment to shop mechanics working on motorcycles or ATVs.