More blubbering by folks that don’t know that much…. We get really tired of hearing that the two line system is a fire/explosion hazard….There is a pressure relief valve in the tank to prevent excess pressure. And, like others here have noted, even single line tanks build up pressure in hot weather/direct sun light.
That fuel pump he is using requires and external pulse, which would come from the intake manifold. But, you would have to alter/change the intake manifold check valve set up in order to provide pressure and vacuum pulses. Again, there is no place to mount a fuel pump, you would have to fabricate something.
In the end, the decision is yours. I just don’t want your decision based on ridiculous claims about the pressure tank system being “dangerous/fire hazard”. On the other hand, all fuel systems can be dangerous if not properly maintained and ventilated….
I just think it will be easier and cheaper to find a decent two line tank, service it, and run the engine as it was set up originally.

Well, I guess that will depend on the cost of a decent fuel pump, vs the price of a decent used tank/hose. But again, converting the engine to single line tank will require alterations to your intake manifold and pressure tank check valve system inside the manifold… I suppose you could drill into the crankcase somewhere instead of messing with the manifold, but that is kind of risky….

I ran many 2 line tanks. OMC & Mercury without any problems. The Pressure tank is much cleaner as the tank isn’t vented to outside air unless an over pressure happens. Look at the seams & bottom for issues.