Hi
SAFETY FIRST
DRAIN PETROL FROM TANK AND WORK IN WELL VENTILATED AREA
DON'T SMOKE
I can't open the photo's you attached so I will assume the plastics are in place and the screw is holding the plastic on, but cross threaded?
You could try long nosed pliers or molegrips and try turning the screwhead anti-clockwise, pulling at the same time.
You could try drilling it out, remember not to drill through all the way, (not a complete disaster if you do drill through, the screw will still act as a plug, you could also use a small 'o ring' or plumbers PTFE tape to act as a seal) if the screw spins when drilling, try superglue to fasten it.
Both of the above will mean you will have no useable thread left so you will have to use a thread insert to comlete the repair.
Another way could be to drill out the screw or just cut it flush with the tank and fibreglass a bighead fastener to the tank, that way you will have a threaded stud sticking out from the tank, hold the plastics on with a nutlock instead of a screw.
None of the above options are easy, there is no easy fix I'm afraid.
You could just drill or cut the head of the screw off, and just rely on the other screw/nut at the front of the plastic to hold the plastic in place.
Remember to flush out the tank before re-fitting.
Personally I would search ebay for a replacement tank.
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