More fuel!

My pressure washer is run off a Honda GX390 engine.

I’m think about upgrading the fuel tank on this to get longer working time out of each fill.
Looking at going for something like a poly fuel tank from a boat.
The question l have is…
Will it have to be mounted above the engine?
Or will the GX390 have enough to draw to pull the fuel up??
Thoughts, ideas and experiences much appreciated

Either mount high or add a small fuel pump. 390 won’t draw fuel

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