On the top fo the tank, there should be some access ports. I believe this is a twin engine. There should be 2 fuel lines, one to each access port. If there is a generator, there will be a fuel line for the generator as well. There should be a couple of wires coming from one of the access ports. This should be your fuel sender. So an access port for each fuel consumming device and one with wires for the sender. Remove the one with wires and you should find you sender and float attached to it.
I hope this helps.
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