Stalled.several times before dying. Replaced the fuel pump, filter, and now the relay switch under the hood. Pump won't turn on (no sound at all). Not getting any fuel.
Mechanic is cleaning the tank selector switch. (Was told front tank had issue of idling but dying when given gas pedal, and would "blow a fuse if switched while running, so I never used it) All fuses have been checked.

 

Locate the ECU, usually behind the kick panel. Disconnect the battery and remove the cover off your processor. Look to see if any of the three electrolytic capacitors have bulged out or leaked onto the board.If you find this condition, replace all three if you have soldering skills.That could solve your fuel delivery problem.

 

When you first turn the key on, you should hear the fuel pump run for 1-2 seconds. If you turn the key off , wait 2-3seconds then turn the key on you should hear the fuel pump run for 1-2 seconds. Does it do that?
The ECA provides the ground for the fuel pump relay to close and energize the fuel pump for the 1-2 seconds. (Don't forget to check the inertia switch , something may have tripped it.) What do you get?

 

What is the ECU, and what does it look like
Okay, I Google it...my mechanic is checking it out.. Question: I have a 1991 f250 diesel that had a tree fall on it...would the ECU work in this 1990 460 gas?

 

We get nothing...and have checked the inertia switch.

 

The ECUs are not interchangeable.

Before condemning an ECU we try to make sure everything else is working as it should. We don't know if the fuel pump relay is working, And if it is ,is there any reason the signal from the relay is not getting to the fuel pump. Just not a good feeling after you drop the tank, replace the fuel pump and still have the same problem.
You might want to check if power and ground are available at the fuel pump when it is supposed to work for the 1-2 seconds.There is a test you can do to power the fuel pump separately, It is somewhat lengthy and if you type it in, you can decide if you want to try it.

 

ECU is the computer. They are very reliable. What goes wrong with them is age and age related failure of capacitors. When they fail, the fuel system goes down.It is easy to detect after removing the cover of the computer module.

 

How can one determine if it's good or bad? We've replaced the fuel pump and the pump relay, already. He's gonna clean the tank switch, next,, before tackling the ecu.

 

We can't stop you from spending a lot of $$$ hoping to correct the problem.
What we can do is suggest either you or your mechanic verify there are no opens in the circuit path to the fuel pump. Lets hope that takes care of the problem. If it doesn't ,get back to us and we should be able to assist.

 

I told you what to look for in post #2. The computer itself is very reliable until age destroys the electrolytics. Very easy to see once the cover is removed. Don't assume it's bad until you examine and test..You can pierce the pump's wiring to see if it has power and a good ground.