Dead mustang.

[Little red riding hood]

Got a mustang a few years ago, really good deal, neighbor was getting divorced, so the price was right, but it burns about as much fuel as my f250, so I didn't have much use for it, so I parked it for a couple years.
Now I need it for driving to work. (Blew the motor on the other car)
So I put a new battery in and cranked it, but no go.
I checked the fuses, they all look Good, I can't hear the fuel pump when I turn the key on, so I'm thinking that's where my problem is.
Do I have to rip out the tank and put in a new pump? Or is there a controller for that pump that might be easier to check first?

[elkdump]

It is REALLY important to know what year and engine size for your car , before any mechanical advice can be of value,,,

[Little red riding hood]

Year is 2000 engine is v6

[elkdump]

You should hear the fuel pump when the ignition is turned on,( have someone listen at the gas cap filler, with gas cap removed ) they should hear a buzzing for a few seconds every time you cycle the ignition key off and on,

The inertia switch could have deployed ( you can google where and how to reset that,

Fuel pump could have just ( stuck and can't restart) take rubber hammer give a few good thumps in bottom of fuel tank, this may restart fuel pump,

[Arty]

Every once in a while you come across a Youtube video where somebody 'discovers' some interesting or rare collectible, then tries to start it up right away after replacing the battery.

That's so bad, because there can be so many things which have seized up, plugged up, corroded, drained out, etc., that trying to crank or ignite the engine causes huge amounts of damage.

Anything which has sat for years really needs to have all relevant parts and fluids replaced, and the rest cleaned and adjusted as appropriate, before trying to start the engine. Especially if it was put away dirty in the first place.

https://www.youtube.com/watch?v=f0CragRdCVI

https://www.youtube.com/watch?v=34CRCZWwNhM

[Suzukisam]

Look for a red flashing light on dash or by defrost duc it has a security key and will shut pump off. They sometimes lose the memory of thier key when left parked with dead battery for long time

[Little red riding hood]

So I found that I've got spark, it will start when I load it up with ether.
But won't keep running, so I checked the inertia switch in the trunk, no problems there... took a multimeter and checked the power at the fuel pump, maximum 5 volts!
Doesn't seem to have a fuel relay, so I gotta talk to ford tomorrow and see if they can flash it.
Unless anyone here has any other suggestions for me to try.

[Arty]

An infamous problem on the f150 is the fuel pump controller bolted to a chassis crossmember near the axle. The pot metal housing backside contacting the steel member corrodes badly from road salt, letting all sorts of dirty salty water directly onto the electronics inside. That buggers up the fuel pump, leading to a no-start.

I caught mine with a hole the size of a silver dollar, before the electronics started to fry. New ones come with a standoff so there's no contact between the metals anymore.

Maybe something similar on your 2000 'stang?
https://www.youtube.com/watch?v=HPbwBEfWVO0

Purging the fuel lines and swapping in a new fuel line filter afterward might be good too.
https://www.youtube.com/watch?v=smY3GNyRU4Y

[Reeves1]

So I found that I've got spark, it will start when I load it up with ether.

[Big_Willy]

Check to see if your model is equipped with an inertial cut-off switch. Some Fords have them usually in the trunk under carpeting. They shut off fuel pump during perceived collision. May be as easy as pressing a button...

[Big_Willy]

Disregard. I read that you have done this already...