How do you tell besides looking at a FP gauge when your stock LP is crapping out? I don't have a gauge but with my smarty on about 5 and wot it will kinda hesitate a little up and down like its getting fuel and then running out of fuel and then pickin back up.. You can also tell by the turbo spooling hard and then hearing it slow down spooling a little then picking back up..

 

10. Verify proper low pressure fuel supply to the high pressure pump: Perform the
appropriate fuel supply system flow test. NOTE: This procedure can be slightly
different depending on if the vehicle has an engine-mounted transfer pump or
the in-tank transfer pump. In a good low pressure fuel system, fuel flow of 560 mL in
10 seconds or better is expected for model year 2003 and early 2004 vehicles. In a
good low pressure fuel system, fuel flow of 590 mL in 10 seconds or better is expected
for late model year 2004 through 2007 vehicles. Be sure there is no air in the system.
Is the low pressure fuel supply volume sufficient?
a. Yes >> Go to Step #11.
b. No >> Repair the low pressure fuel supply system as necessary. Vehicles
equipped with an in tank fuel pump: Refer to the detailed diagnostic information
available in TechCONNECT under: Service Info tab > 9 - Engine > Diagnosis &
Testing > In-Tank Fuel Lift Pump Flow/Diagnostic Test Procedure . Vehicles
equipped with an engine mounted fuel transfer pump: Refer to the detailed
diagnostic information available in TechCONNECT under: Service Info tab >
Diagnostics tab, Powertrain Gas, Driveability Diesel, Fuel Lift Pump Flow And Inlet
Restriction Test >> Go to Step #15

 

Wow you def lost me.. Haha