C·T·S Carburetor Leak Detector Pressure Gauge Kit 0–200 kPa (0–29 psi) with Multiple Adapters and Hoses

The C·T·S Carburetor Leak Detector is a handheld pressure gauge system that tests needle-valve and diaphragm/float-style carburetors up to 200 kPa (29 psi).

This compact kit helps diagnose fuel leaks and slow-closing needles on small engines by applying a controlled pressure to the carburetor inlet and observing whether pressure holds. It replaces common factory testers (Walbro 57-21-1, Zama ZPG-2, Tillotson 243-504, Stens 705-020) and ships with multiple fittings and three fuel hoses for quick compatibility with most carburetor fittings.

How does the pressure range affect leak detection?

Using a 0–200 kPa (0–29 psi) range lets you simulate the small positive pressure required to check needle valve sealing and diaphragm integrity without over-pressurizing delicate parts. The gauge gives a visible reading so you can tell if pressure drops — indicating a leak — or remains steady, indicating a sealed needle/diaphragm.

• Range: 0–200 kPa (0–29 psi) for precise small-engine testing
• Clear dial shows pressure changes for quick diagnostics
• Safe for most small carburetor housings when used properly

Which adapters and hoses are included, and why do they matter?

The kit includes two additional adapters (3 mm and 4 mm fittings) plus three fuel hoses sized ID 3/32", ID 3 mm, and ID 6 mm to fit a wide variety of carburetor inlet sizes and fittings. This assortment reduces the need for aftermarket parts and speeds up testing across different brands and models.

• 3 mm and 4 mm adapters for varied inlet sizes
• ID 3/32", ID 3 mm, and ID 6 mm hoses to match common carb ports
• Adapters and hoses let you test diaphragm and float-style carburetors quickly

How do I use this gauge to find a leaking needle valve?

Connect the appropriate adapter and hose to the carburetor inlet, pressurize the gauge gently to a test pressure, then observe the dial for any pressure drop. If pressure falls over a short period, the needle/seat or diaphragm may be leaking and require cleaning or replacement.

• Select the matching adapter and hose for a snug connection
• Bring pressure up slowly — watch for immediate or gradual drops
• Repeat testing after cleaning or servicing to confirm repair

Will this replace OEM testers and work with different carburetor brands?

Yes — the C·T·S leak detector is designed to be a practical substitute for factory tools like Walbro 57-21-1, Zama ZPG-2, Tillotson 243-504 and Stens 705-020. With the included adapters and hoses, it covers most small-engine diaphragm and float-style carburetors used on chainsaws, trimmers, blowers, and similar equipment.

• Direct replacement for several common OEM part numbers
• Multiple fittings increase cross-brand compatibility
• Handheld and portable for bench or field use

Who is this for: Mechanics, landscapers, small-engine technicians, and DIYers who service carbureted small engines will find this C·T·S tester a useful diagnostic tool. It’s suited for anyone needing a reliable, portable way to verify needle valve seals and diaphragm integrity across a variety of carburetor makes and models, without relying on single-size fittings or factory-only tools.