6.7L Cummins Injectors and Fuel Lines – Fuel Drain Line Restriction – Measure

Operate the engine at cranking or low idle and measure the fuel pressure.
Observe the reading on the gauge.

If the fuel drain line restriction is too high:
• Check the OEM fuel lines to the tank for proper size, leaks, bends, or clogs.
• Check the fuel tank vents for plugging.