An engine needs three things to run, mechanical integrity (you must have that or the engine would not run when it does start), spark and fuel. You need to determine if you have lost spark or fuel when the car is in a failed state. Check for fuel pressure (you will need a fuel pressure gauge and look up the specified fuel pressure for your vehicle). Remove the fuel hose that goes to the fuel rail and get a friend to crank over the engine to see you have adequate fuel volume (you should have approximately 1 pint of gasoline in ten seconds of cranking). Off course take proper precautions as gasoline is highly flamable. Next "listen" to the fuel injector. Using a mechanic's stethoscope (or use a long screw driver placing the handle end up to your ear place the metal tip end of the screwdriver against the body of the fuel injector), get a friend to crank over the engine while you "listen" to the fuel injector listen to each injector at the same point of the injector body. You should hear "click, click, click" as the injector is electrically opened and closed by the computer. If the injector is not being triggered you will not have fuel getting into the engine's cylinders. Disconnect the electrical connector at the fuel injector with the ignition key in the "on" position, (next position after the accessory position) you should have 12 volts at one of the two wires at the injector. This true for most vehicles but you need to consult a workshop manual for your vehicle to see that this is true for your vehicle. When the engine is running the second wire at the injector gets (triggered) grounded by the computer in your vehicle many times a second controlling exactly when and how much fuel gets injected into the engine. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
Hey thanks Patrick. The crazy thing is that its done it twice now and both times I left the truck there for about 1hr, I came back and it fired right up..Like nothing! yesterday was the second time. I had my wife pick me up, we went to the store came back like 1 1/2 later and started right up! didn’t even hesitate or anything. This morning it fired right up perfectly too. I dont know if the heat has anything to do with it but both times its been hot outside and someone said that it could have something to do with it. After it sits in the shade for a bit it starts right up. Very weird! When I changed the fuel pump I couldnt change the fuel filter because I need a special tool to remove the hose.. could that be the problem?