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use and ammeter to find the short.
having the schemetic , in hand allows you to trace which wire
on that fuse (many) has the short.
why not state the name of the fuse.
and engine size.
alldata.com has the schematics.
Correct pump for the truck? A blown fuse means there is too much current draw from the pump. Why is the tough question.Pinched wire? If the fuse does not blow,immediately,can you measure the current draw at the pump in put wire?
Be SURE to cycle the key on for 5 seconds,off for 2 and back on for 5 seconds 3 times! Prime the pump. If not primed,properly the new pump may burn out. Sorry.
Check the EFI main relay, the circuit opening relay, and the fuel pump relay. Inside the fuel pump relay there is a switch controlled by a coil. During start, the fuel pump gets full power for a couple of seconds to build up pressure. Once pressure is good, the fuel pump relay is supposed to switch (via the coil) the fuel pump to reduced power. If the coil in the relay is bad, the reduced power setting is not available and the fuel pump will run at full power all the time. At this heavy current draw, it won't be long until the EFI fuse blows. This would also give more pressure than is necessary to the cold start fuel injector which runs on a timer. This extra pressure during the time that the cold start injector is operating may be the reason the engine is flooding with fuel.
If you didn't mess with the wiring (cause some people do) you have a short to ground somewhere. basically you have to follow the power flow until you lose power and the short is going to be between the last spot you tested that had power (battery voltage) and the spot were you lost power. hope this helps
The most common reason for the EFI fuse to blow is the wiring is rubbed through somewhere in the engine wiring harness, this fuse supplies power to many EFI parts on the engine, always look for shorts where the most movement is, the engine is that place, most likely the next time you go down a really rough road the short may occure again, carry a few fuses just to be safe.