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Message: [QUOTE="Arisley, post: 1306680, member: 67"] First diesels are fun, you get to relearn all about a motor. Just remember, no spark, it's all compression. Fuel pressure is very important on these motors. You also picked the most difficult diesel motor system to learn and understand. Quick synopsis. This is a HEUI system. Low fuel pressure to the injectors. Each injector is it's own hydraulic pump. There is a low pressure oil pump for lubrication to the motor and it also supplies oil to the High pressure oil pump (HPOP). This pumps pressure is controlled by injector demand (right foot). fuel pressure is supplied to the injectors at about 65PSi. Oil pressure is supplied at anywhere from 500 to over 3000 PSI. This is the hydraulic fluid to drive the injectors. The Injector Driver Module tells the injector to turn on for say 1.5 ms (it also varies). Which drives the fuel into the cylinger and incredibly high pressure (~20K PSi more or less). All of this is controlled by the Powertrain Control module (PCM) and many sunsors (It is an electronically controlled motor, even the throttle is electronic). Parts house scanners will not help you out. If you really want to work on your truck, you need to invest in a quality scanner. I use AutoEngenuity (AE), lots of people on this and many diesel boards do, it is a quality tool, runs about 450 and loads on a laptop. You can get some apps that load on a smartphone and do pretty good for under a hundred. Main part of this post is don't worry about feeling bad about asking for help. I have been working on cars for over forty years, got my truck and was lost till I found these guys. We like to help. [/QUOTE]