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The only way to solve strange issues like this is by finding a local auto electrician with a pro grade scan tool computer. They can record all the functions whilst driving and record exactly what happens when it cuts out.
Does vehicle engine turn over. If yes, then pay attention to fuel system. Check for good power and ground at fuel pump connector. If no power check fuel pump fuse, relay and for open wires (power, ground) to fuel pump.
If you already replaced fuel pump and filter and still no fuel pressure at injectors rail, your problem is more than likely electrical. Check for good power and ground at fuel pump connector. If no power at fuel pump connector, check your fuel pump fuse, relay and wiring for opens(broken) feed wire.
You say the fuses and relays are good. I'm showing three wires for the relay. One lite blue and orange is battery voltage from the fuse. The other lite blue and orange is ground from the computer. When the computer grounds the relay voltage should be sent to the inertia switch on the dark green yellow wire. You should be able to jumper the power and dark green yellow to make the pump run.
The most common cause of this is that the fuel pump is drawing to much current due to wear and a possible burned fuel tank connector at the tank. To replace the pump you must raise the truck up and remove the fuel tank. Also replace the fuel filter which is on the inside of the frame on the drivers side. Use a rag to cover the fuel line when disconnecting it with the required special tool.
Hi,
a variety of reasons could cause the problem. I am curious as to why you changed the fuel pump. Did it fail a test performed on it?
When you fitted the new pump, did you check the main fuel rail to ensure that (a) the pump performed as intended, (b) the pressure control valve for the return fuel line is operating correctly?
A faulty engine sensor could shut the engine down. It would save you a lot of frustration if you had a workshop use a scanning tool on the vehicle system. If you prefer to do your own work rent the hand held scanner from a parts store. There are a myraid of possible causes for your unfortunate situation.
it appears that fuse 30 and the relay right beside it are for the fuel pump. the relay is definately for the fuel pump tho. it's located in the fuse panel inside the engine compartment near the battery.
Robert
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