AUTOOL PT640 GDI Fuel Pressure Tester 0

AUTOOL PT640 GDI Digital Fuel Pressure Gauge Kit

Professional GDI Fuel System Diagnostic

The AUTOOL PT640 is a digital high-pressure fuel tester for petrol direct-injection (GDI) engines. Use it to measure the output of the high-pressure fuel pump and diagnose low rail pressure, weak pumps, faulty pressure sensors and regulators, which cause hard starting, loss of power and fuel pressure fault codes.

Its 0–360 bar range covers GDI rail pressures that a standard fuel gauge cannot read. The T-piece adapter lets you read actual pressure while the engine runs, and compare it with the value reported by the rail pressure sensor on your scan tool.

AUTOOL PT640 digital GDI high-pressure fuel tester

Main Features

High-pressure range: 0–360 bar / 0–5221 psi / 0–367 kg/cm², with 0.1 resolution.
1% FS accuracy: reliable readings for comparing against factory specifications and sensor data.
Over-pressure alarm: warns when pressure exceeds 355 bar. Overload limit 400 bar.
Max, min and differential values: capture pressure changes during acceleration and load.
GDI adapter kit: high-pressure adapter hoses, metal adapters and a T-connector.
Data hold and lock: freeze a reading so you can record it.
2.8-inch backlit display with switchable bar, psi and kg/cm² units.

Important Notes

For petrol direct-injection (GDI) systems only. Not for diesel common-rail systems.
Depressurise the fuel system using the manufacturer's procedure before connecting or disconnecting.
Use only the supplied GDI-rated hoses and adapters.
Requires 4 × AAA batteries.

Package Includes

1 × AUTOOL PT640 digital GDI pressure gauge with measuring probe
1 × GDI adapter kit (high-pressure hoses, metal adapters, T-connector)
1 × Carry case
1 × User manual

AUTOOL PT640 is a professional-grade digital fuel pressure testing solution

Feature	Benefit
0–360 bar range	Reads GDI rail pressures beyond a standard fuel gauge
1% FS accuracy	Verify the rail pressure sensor against a real reading
355 bar over-pressure alarm	Warns before the gauge's limit is reached
T-connector adapter	Read pressure with the engine running
Max / min / differential readings	Spot pressure drop under load
Backlit 2.8-inch screen	Readable in low light

AUTOOL PT640 high-pressure fuel system tester

AUTOOL Digital Pressure Testers: Which One Do I Need?

Each AUTOOL digital pressure tester is built for one system, with the pressure range and fittings to match. All have a backlit digital display and switchable bar, psi and kg/cm² units. Choose by the system you need to test and the fault you're chasing.

Model	What it tests	Helps diagnose	Pressure range	Stand-out feature
Engine
AUTOOL PT610	Engine cylinder compression (petrol)	Worn piston rings, leaking valves, failed head gaskets	0–29.4 bar 0–426.6 psi	Stores 6 cylinder results	View PT610
AUTOOL PT620	Engine oil pressure	Low oil pressure, worn oil pumps and bearings, faulty pressure senders	0–29.4 bar 0–426.6 psi	18 adapter types, 0.5% FS accuracy	View PT620
Fuel system
AUTOOL PT630	Fuel pressure, port-injected petrol engines	Weak fuel pumps, faulty regulators, leaking injectors, blocked filters	0–29.4 bar 0–426.6 psi	17 adapters, pressure-hold timer	View PT630
AUTOOL PT635	Fuel pressure and fuel temperature, petrol engines	As PT630, plus fuel temperature during testing	0–29.4 bar 0–426.6 psi	31 adapters, average readings, 0.5% FS	View PT635
AUTOOL PT640	High-pressure fuel, petrol direct injection (GDI)	Weak high-pressure pumps, low rail pressure, faulty rail pressure sensors	0–360 bar 0–5221 psi	Over-pressure alarm, 1% FS accuracy	View PT640
Transmission, brakes & suspension
AUTOOL PT650	Automatic transmission oil pressure	Slipping, harsh or delayed shifts, worn pumps, sticking valves	0–29.4 bar 0–426.6 psi	12 copper adapters, 0.5% FS accuracy	View PT650
AUTOOL PT660	Brake hydraulic pressure, 2 channels	Pressure imbalance between calipers, line or master cylinder faults	0–210 bar 0–3045 psi	Live left/right difference	View PT660
AUTOOL PT680	Air suspension pressure, 2 channels	Leaking air springs, lines and connections	0–20 bar 0–290 psi	Live left/right difference	View PT680

Match the tester to the system. Never connect a low-pressure tester (0–30 bar) to a GDI, diesel common-rail or brake hydraulic circuit, and always depressurise the system before connecting or disconnecting.

Specifications are based on AUTOOL data. Refer to each product page or contact us for more information.

AUTOOL PT640 GDI Fuel Pressure Gauge Kit

Application	Petrol direct-injection (GDI) high-pressure fuel systems
Pressure Range	0–360 bar / 0–5221.3 psi / 0–367 kg/cm²
Overload Limit	400 bar
Over-Pressure Alarm	Above 355 bar
Accuracy	1% FS
Resolution	0.1
Units	bar, psi, kg/cm²
Readings Displayed	Real-time, maximum, minimum, differential, measurement time
Functions	Zero, data hold, data lock, clear, record
Data Storage	Not supported
Display	2.8-inch backlit screen
Adapters	High-pressure adapter hoses, metal adapters, T-connector
Power	4 × AAA 1.5 V batteries
Not Suitable For	Diesel common-rail systems
Warranty	3 years main unit, 1 year accessories (manufacturer)

AUTOOL PT640 Technical Specifications

Delivery

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