I've seen a series of photos from some years ago of a Scimitar (Ford V6 engine) that had the metal fuel inlet pipe pop out of the carb (known fault with a simple cure) and spray fuel onto the top of the engine.
First one showed smoke coming from under the bonnet.
Next couple showed the whole car becoming engulfed in flames
Last one after Fire Brigade had done its work showed the metal parts, chassis, engine, gearbox, axles, wheels (minus tyres which had also burnt) seat frames etc all covered in the glass strands which was all that was left of the grp.
Bit of a
moment and when I checked mine the same pipe was loose!
Probably best to replace them all while you're at it and the parts on the fuel lines.
If it's a flapper AFM once you've clamped everything up and before you put the plenum etc back on switch on the ignition and push the flap open. This will run the pump, pressurise the system, circulate the fuel round the system and back to the tank so you can check all connections are good. Release the flap and the pump will stop.
If it's hotwire I have no idea!