Fuel Pressure Regulator Check
WARNING: This page is about a different car, the 2004 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
- Stop engine and disconnect fuel pressure regulator vacuum hose from intake manifold.
- Plug intake manifold with a rubber cap.
- Connect variable vacuum source to fuel pressure regulator.
- Start engine and read indication of fuel pressure gauge as vacuum is changed.
Fuel pressure should decrease as vacuum increases. If results are unsatisfactory, replace fuel pressure regulator.