1992 f250 grease conversion

Hi, just a few questions for you all about converting my 1992 f250 7.3 L truck. I was going to buy a kit from golden fuel systems, but at $1500 I am trying to figure out if I can do it on my own. My question is this:

Can I just extend my coolant lines and wrap them around the existing fuel line and then tie it all together into a hot fox in the tank?

also I already have two fuel tanks, do I need to buy the solenoid port system, doesn't my truck already have that system in place.

I'm also wondering what natural rubber in the fuel system needs to be replaced by synthetic rubber.

any ideas.

Thanks,
Adam

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