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Won't submerging the return line into the gas already in the tank increase the return line pressure?

I know it makes a big difference on my water tanks at the job site, I have to keep the hose out of the water in the tank I'm filling or the flow really slows down.

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Wondered the same thing but my pump is pre-set at 27 lbs. iirc and others I know use a tube w/out any issues. I don`t normally run a full cell(12 gallons)cos of the added weight although it helped before my suspension mods came around and now that it hooks pretty good I figured w/less fuel in the cell the tube would help...........or not.