Fuel Drain Line Restriction (006-012)
B3.9 and B5.9 Series Engines
Section 6 - Injectors and Fuel Lines - Group 06
Remove the banjo fitting capscrews and washers.
Disconnect the fuel drain line fittings.
Install the 0 to 207-kPa [0 to 30-psi] pressure gauge.
NOTE: The disconnected return line tee (return from the
pump) needs to be capped.
Operate the engine at rated speed and no load.