FUEL TESTER CUP (P/N f391ss) - New Surplus

The f391ss is a fuel tester cup designed for preflight fuel-system sampling at aircraft sump drains. This clear plastic cup engages standard quick-drain valves to collect fuel samples for inspection. Press the cup's probe against the quick-drain valve to draw a sample, then visually check for water contamination, sediment, or particulates before engine start.

Inspect the sample against a light source, then dispose according to POH/AFM procedures and local environmental regulations. Essential for routine preflight checks on general aviation aircraft.

What is the FUEL TESTER CUP (P/N f391ss)?

The f391ss is a fuel tester cup designed for preflight fuel-system sampling at aircraft sump drains. This clear plastic cup engages standard quick-drain valves to collect fuel samples for inspection.

Is the f391ss compatible with AVGAS and Jet-A fuels?

Fuel system components are designed for specific fuel types per their engineering specifications. The FUEL TESTER CUP should be verified against your aircraft's fuel system requirements. Currently available in: New Surplus. Contact us for fuel compatibility details.

Does the f391ss require companion seals or gaskets for installation?

Many fuel system components require new gaskets, O-rings, or seals during installation. Check your aircraft maintenance manual for the FUEL TESTER CUP installation requirements. We stock related sealing components and can help identify companion parts.

Are there shipping restrictions for the f391ss?

Most fuel system hardware ships via standard methods. Certain items containing fuel residue may require hazmat shipping procedures. We handle all packaging and shipping compliance. Same-day processing available for in-stock items.