With engine off, relieve fuel system pressure. See FUEL PRESSURE RELEASE in this article. Attach Fuel Pressure Gauge Set (J-34730-1) at fuel filter inlet in front of fuel tank. See Fig 1 . Cycle ignition switch from OFF-to-ON position a couple of times to build-up fuel pressure. Leave ignition in ON position.
Measure and record fuel pressure with pump operating and engine off. Start engine. Measure and record fuel pressure with engine idling. See REGULATED FUEL PRESSURE table. Turn engine or fuel pump off and allow one minute for pressure to reduce. Minimum fuel rest pressure should be 21 psi (1.5 kg/cm² ).
If pressure is not within specification, check for defective fuel pump, pressure regulator or restriction in fuel system. Repair as necessary. Remove pressure gauge. Start engine and check for fuel leaks.

Fig 1: Testing Tracker Fuel System Pressure

Courtesy of GENERAL MOTORS CORP.

REGULATED FUEL PRESSURE

Application

⁽¹⁾ Pressure psi (kg/cm² )

Tracker

34-40 (2.4-2.8)

⁽¹⁾	With ignition on, engine idling and fuel pressure regulator vacuum hose connected.

MAXIMUM FUEL PRESSURE

Application

⁽¹⁾ Pressure psi (kg/cm² )

Tracker

More Than 57 (4.0)

⁽¹⁾	Fuel line pinched before inlet to TBI or fuel rail.

REST FUEL PRESSURE

Application

⁽¹⁾ Pressure psi (kg/cm² )

Tracker

Approximately 21 (1.5)

⁽¹⁾	Ignition switch and engine off.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Fuel Pressure Test