Fuel Testers & Gauges for Aircraft

Sump testing is one of the first skills a student pilot learns and one of the last things an experienced pilot skips. Checking fuel samples from each sump drain before flight confirms no water contamination, the right fuel grade, and that the fuel cap sealed properly. It takes two minutes and the consequences of skipping it can be catastrophic.

Our aircraft fuel tester collection covers the most widely used sump drain tools for AVGAS (100LL) and Jet-A preflights. Standard fuel testers have a clear tube that lets you visually inspect the sample for water contamination and color while draining cleanly into a container. Specialty testers are available for specific aircraft with non-standard sump drain configurations.

For other preflight safety essentials, see our aircraft CO detector collection and our full pilot essentials collection.

Aircraft fuel testers for a safer preflight

A fuel tester is the simplest piece of safety equipment in the cockpit and one of the most important. Draining a sample from each sump before flight lets you confirm there is no water or sediment contamination, that the fuel is the correct grade and color, and that nothing has settled in the tanks since the last flight. Every tester below drains cleanly into a clear tube or jar so you can inspect the sample, then return clean fuel to the tank or dispose of contaminated fuel safely.

Fuel testers at a glance

Tester	Brand	Best for
Aviation Specialties GATS Jar with Separator	Aviation Specialties	Filtering and returning clean fuel to the tank
ASA Dual-Head Fuel Tester with Octane Chart	ASA	Standard preflight sump checks plus fuel-grade reference
Daansen Multi-Function Tester with Screwdriver	Daansen	A do-it-all tool that opens the sump drain too
FuelHawk Precision Fuel Gauges	FuelHawk	Reading actual fuel quantity in the tank
Innoquest Easy-Access Gulfstream Sump Tester	Innoquest	Hard-to-reach sump drains on specific aircraft

Top fuel tester brands

Aviation Specialties (GATS Jar)

The GATS Jar is an eco-friendly, cost-effective sampler that filters water and contaminants out of the fuel so the clean AVGAS can be poured back into the tank instead of wasted. It is a favorite for pilots who want to inspect and recover fuel in one step.

ASA

The ASA dual-head fuel tester is a straightforward preflight staple that draws a clean sample for visual inspection and includes an octane chart for quick fuel-grade reference. It is a dependable pick for student and rental pilots.

Daansen

The Daansen multi-function tester detects water and dirt in the sample and adds a built-in screwdriver and sump-drain opener, combining several preflight tasks into one tool.

FuelHawk

FuelHawk precision fuel gauges give accurate, real-time fuel-quantity readings for general aviation aircraft, helping you verify how much usable fuel is actually in the tanks before you launch.

Innoquest

Innoquest builds easy-access sump testers designed for aircraft with non-standard or hard-to-reach drain configurations, so you can still draw a proper sample from every sump.

How to choose the right fuel tester

Match the tester to your aircraft and your routine. For most piston singles, a standard clear-tube tester or the GATS Jar covers every sump drain you will use. Consider these factors:

Fuel recovery. A filtering tester like the GATS Jar lets you return clean fuel to the tank instead of discarding it, which adds up over time.
Drain compatibility. Some aircraft have recessed or non-standard sump drains. If yours is hard to reach, a specialty tester such as the Innoquest is built for that geometry.
Built-in tools. Testers with an integrated drain actuator or screwdriver reduce what you carry in the flight bag.
Durability. Choose corrosion-resistant, fuel-safe materials so the tester holds up to repeated AVGAS and Jet-A exposure.
Quantity verification. If you also want to confirm how much fuel is in the tank, add a calibrated gauge like the FuelHawk to your kit.

A fuel tester pairs naturally with the rest of your preflight gear. See our aircraft CO detectors, cockpit supplies, and the full pilot supplies and aviation equipment collection.

Why buy from Pilot Mall

Aviation only. We focus exclusively on pilots and aircraft, so every tester here is built for real preflight use.
Trusted for 25+ years. Tens of thousands of pilots rely on Pilot Mall for their gear.
Free U.S. shipping over $100. Stock up on preflight essentials and ship them free.
Expert guidance. Our team flies and can help you match the right tester to your aircraft.

Frequently Asked Questions

How often should I test aircraft fuel?

You should sample fuel from every sump drain before each flight and again after every refueling, because water and sediment settle to the bottom of the tank where the drains are located and can collect at any time.

What contaminants does a fuel tester detect?

A fuel tester reveals water, dirt, rust, and sediment in the sample, and the clear tube also lets you confirm the fuel is the correct color and grade for your engine, such as blue 100LL AVGAS or clear-to-straw Jet-A.

Are aircraft fuel testers reusable?

Yes, aircraft fuel testers are fully reusable; you draw a sample, inspect it, then either return clean fuel to the tank or dispose of contaminated fuel and wipe the tester for the next use.

What is the difference between a fuel tester and a fuel gauge?

A fuel tester draws a sample from the sump drain so you can check fuel quality and contamination, while a fuel gauge such as a calibrated dipstick measures how much usable fuel is in the tank; many pilots carry both.