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My previous install used 4’ of clear plastic tubing for running the fluid down to the pump. It is 1/2” outer and 3/8” inner. It runs along the bottom of my CAI box, and then though a hole at the front. I have the hose zip-tied to flex-loom to prevent it from wearing on the sharp metal in this area. It then goes downhill to the OEM pump.
I put a smaller hose over the pump shaft, then slid the bigger one over that, and secured both with a hose clamp. I ran the line so that the pump is the lowest point; this prevent any air bubbles from interrupting the fluid flow.
(green line is fluid, yellow is air scoop)
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