My 1987 wont start a second time after warming up.

1-4-2-5-3-6

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you're a victim of a flooded engine. if it's got fuel injection then crank it with the gas pedal fully depressed; that's called a clear flood mode that shuts down the injectors while cranking to give the plugs a chance to dry off. if it's got a carburetor then you'll have to take the plugs out and dry them off manually. in either case you should pull out the oil dipstick and smell it; if it smells strongly of gas you should change the oil to avoid bearing failure because the oil has gas in it and is too thin to lubricate. I usually take out the plugs and either blow them dry with a compressor or put them on a hot plate to warm them up so if there is any gas in the cylinders it will ignite faster. while they are heating up I blow the cylinders with compressed air to eliminate any accumulated fuel in the cyl. before I put the plugs back in. make sure the choke is open and crank it with the gas pedal fully depressed for about 5-10 seconds and then release the gas pedal. It should start.

check for corossion on the asd relay.

your fuel injectors will be leaking and flooding the motor when warm, you can have them cleaned or try pull your EGI fuse and crank it over a few times then put the fuse back in and start it up

the injectors get old and under pressure they will leak when off and just drip fuel into the motor, no joke i have seen about 20 cars with this problem

well if tune up and normal maintenance is current I would guess its the cold start valve. When the valve starts to fail or fails it can allow the extra fuel used at cold idle to "flood" the system when its not needed when warm.

you can get high performance rebuild kits for those t-5 trans from summit for a very reasonable price and just get it rebuilt and you can hold up to 800 horses on that t-5 after that or just pick up a new or used tranny and replace it

you have answered you own question bruv change remove the fuel pump and inspect

try unplugging the alternator and see if it still floods. I have seen this before where the alt causes interference with the computer and floods vehicle. Also check the ground cable from battery to engine make sure it is tight

The interlock can have something to do with it. I've actually seen those devices rob the battery and create no starts. If it's not installed properly, then it can cause different things to go wrong with the car. Check the condition of your cables. Use a remote start button on the solonoid to make sure the solenoid isn't bad. Load test the battery as well. Check to make sure that your alternator is charging properly.

Your bushings in your starter are probly worn out. Its a fairly common problem on fords. My own mustang did it often as well. The starter is right near the exhaust manifold so sometimes when it cools down it works again a few times but you will want to get your starter changed out as soon as possible.