Where is the Schrader valve located to connect my fuel pressure tester?

Here are the instructions on how to check the fuel pressure. Also, check the diagrams below.

Fuel Pressure Test
Observe all fuel system safety precautions when connecting and disconnecting fuel lines. Keep a dry chemical fire extinguisher near work area.

Use suitable adapter to connect 100 PSI transducer to injector fuel rail or fuel filter outlet.

Toyota/Lexus vehicles do not use Shrader valves on fuel rail. System uses plastic fuel lines with quick disconnect type fittings. Fuel pressure gauge can be installed by using "Tee" connectors.

Crank Engine to check transducer fittings and hoses for leaks before continuing.

At idle, pressure should be about 46.5 to 47.4 PSI. While idling, disconnect vacuum hose at regulator. Fuel pressure should rise.

Stop the Engine and continue to observe pressure. Should hold a minimum of 21 PSI for 5 minutes. If pressure drops, inspect hoses, connections, fuel pump and injectors for leaks.

Briefly snap throttle to wide open throttle. Pressure should not drop more than 2 to 4 PSI. May need to road test vehicle to duplicate fuel supply problems.

If pressure is low, pinch fuel return hose at base of pressure regulator. Do not pinch main fuel line. If pressure increases, suspect pressure regulator.

If pressure does not increase, suspect fuel pump or filter. In some cases, system fuel filter may be in tank with pump unit.

Note: verify fuel pump runs. If not perform normal circuit check. If OK, unplug power connector at fuel pump (top of tank) and check resistance at pump.

If pressure is high, turn Engine off and disconnect return line at regulator. Connect a hose from regulator outlet to a suitable container.

Start and shut off Engine several times. Note pressure. If pressure drops, suspect restricted return line. If pressure remains high, suspect pressure regulator.

To test residual fuel pressure on MFI vehicles, turn Engine off. Pressure should remain at 21 PSI or more after 5 minutes at rest. If pressure drop exceeds limit, isolate drop by pinching off fuel pump pressure hose (pump side of gauge). If pressure holds, suspect fuel pump.

If pressure continues to drop, pinch off fuel return hose. If pressure holds, suspect pressure regulator. If pressure still drops, suspect injector leak or cold start injector if equipped.

Check out the images (below). Please let us know if you need anything else to get the problem fixed.