gtrboyy
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Sorry what lines inside ? There are none apart from the rubber return line that goes from the pump assembly plate to the bottom of the swirl pot. BTW if you fit the return line to the pump structure so that it feeds back in to the top of the swirl pot then you still have an issue with it feeding straight out of the return line port that's open to the tank.
Fuel in tank will slow most of it down from draining out & will still be fed from return hose up top...should not be an issue untill tank is low on fuel.
vk efi,vl & early vn have no swirl pot just just return up high in tank on drivers side.
If you look inside tank above swirlpot you will see what looks like plastic expansion tank....that is what lines from filler neck to top of fuel tank fittings...for pollution,overflow & pressurisation is my guess.