Authors at InternationalPowerStroke.com and Little Power Shop detail common 6.0L Power Stroke problems and solutions. Diesel IQ offers troubleshooting advice on the 7.3 Power Stroke diesel engine.
If a 7.3L Power Stroke engine won't start, suspect the injector driver module or lift pump. Inspect the injector driver module for moisture or wire damage, and replace if necessary. To troubleshoot the lift pump, check the fuel bowl before and while trying to start the vehicle, and add clean fuel if necessary. If this causes the engine to start, replace the lift pump. If the engine takes a long time to start or loses power, change the fuel filter.