Fuel Tank Inlet Valve: Inspection: Measure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

Operate the engine at idle (minimum 600 to maximum 1000 RPM) and measure the fuel inlet restriction.

Observe the reading on the gauge.

Maximum Fuel Inlet Restriction Vacuum at High Idle

: 20 mm (6 in)

NOTE: With the engine running, there should not be any air bubbles in the clear pressure adapter test line at the Stage 1 fuel filter inlet. Air bubbles are a sign of severe inlet restriction, loose suction-side fittings, or a system that is not yet primed.

If the fuel inlet restriction is too high, check the fuel lines from the tank for proper size. Make certain there are no kinks or bends in the fuel lines and the fuel lines are not clogged.
Check the fuel tank for debris (plastic wrappers, paper, etc.) that can intermittently block the fuel pickup tubes.
Check the fuel lines for internal damage, such as damaged wall linings, that can intermittently block fuel flow.
Check the fuel tank vents or fill cap vents for plugging.
Make sure there are no clogged fuel strainers or filters, or malfunctioning check valves.
If no issues are found, replace the suction-side fuel filter and prime the fuel system. Refer to Priming .