Ok, if it only works with fuel poured in and you have good pressure, I would rule out the regulator, and fuel pump. Need to know which engine you have.I think there are 5 different ones for that model.
It sounds to me like your injectors are not opening. In most of your type of vehicles power is pupplied to all injectors by the underhood fuse-relay center. Usually the fuse is a 20a ECM 1 fuse. Make sure that is getting power first.
That eliminates power to injectors as a problem, and just leaves control.
Control is done by the VCM (Vehicle Control Module).
In most vehicles, once the ignition signal is satified from the ignition switch, it tells the VCM to give fire and fuel. Since you have ignition, we can assume that signal is getting there. Now comes the tricky part.A timing signal is sent to the VCM from both the crankshaft sensor and the cam shaft sensor to time the fire and fuel. A lot of vehicles will use the crankshaft sensor for spark, and the cam shaft sensor for fuel injectors. Im trying to read up on your truck and see which your uses.
I think most injectors run on a 5v supply, so I wouldnt put too much voltage to them.
I did find these descriptions I will paste for you to read.
When the ignition switch is turned to the ON position, before engaging starter, the Control Module energizes the fuel pump relay for 2 seconds allowing the fuel pump to build up pressure. The Control Module then checks the Engine Coolant Temperature (ECT) sensor and Throttle Position (TP) sensor in order to determine the proper air and fuel ratio for starting. The Control Module controls the amount of fuel delivered in the starting mode by changing how long the injectors are energized. This is done by pulsing the injectors for very short times.
Tuesday, January 2nd, 2007 AT 4:19 PM