Possible Causes

WARNING: This page is about a different variant/trim than selected.

A stuck open regulator valve will cause low fuel pressure.
A stuck closed regulator valve (possibly caused by debris) will cause high fuel pressure for a short time until pump fails.
A loose fuel line on suction side of fuel system can cause air to be ingested into system and cause low fuel pressure.
Electric fuel pump.
Fuel pump fuse.
Fuel pump relay.
Inertia Fuel Shutoff (IFS) switch.
Fuel pump circuit faults.