No fuel injector pulse

08 Toyota Tundra 5.7, trying to get it going again for my buddy after it was sitting for 6 months, he said it would start and die, it cranks with no start, so I replaced the fuel pump, has better fuel pressure now but still no fire, double checked with some fuel down intake the it had spark and it ran until it burned the gas off so I pulled injectors and let the fuel rail drip into the injector ports and it would run. Long story short I checked the fuses related to the injectors and ignition and everything is good, I did see the little chocolate droppings around the intake so I suspect rodent damage somewhere, however I didn’t see anything that really stuck out. Harness seem to sit on the motor really tight, I’m wondering if possibly it’s pulling to hard on the connections to hard and maybe a wire is loose, or possibly rubbed through the insulation in a spot I can’t see. What’s y’all thoughts?

 

Unfortunately it sounds like you are on the right track with rodent damage.

I hear they like to make homes in the valley of the block, so I would probably start by removing the intake and looking for chewed wires.

 

The injectors has a two legs, one is hot 12+v all the time, the other leg goes directly to the Engine ECU. The ECU grounds the second wire for a determined amount of time to power the injector and inject fuel.
First make sure your fuse powering the injectors is good. Then get a voltmeter, one lead to the 12v leg of the injector, the other to a good ground. Make sure you have a good 12V at each injector with the key on. If you do then all you need is the ground signal from the ECU to flow fuel.

I would also check every fuse in the truck. Some are tired to other circuits and relays that power things like the Fuel Pump ECU when the key comes on.