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Message: [QUOTE="old man dave, post: 955201, member: 1009"] I believe there's at least one pump maker that requires AN-10 or equivalent suction side or your warranty is toast. Another reason is pumps don't do a good job of sucking fuel but they push very well. There is only 14.7 pounds (atmospheric) pressure pushing the fuel towards the pump. So, a reduction (larger hose) of hose sidewall friction (drag) allows the fuel to move more freely towards the fuel pump from the tank. Its the same reason well pumps cannot lift water more than 34 feet without a booster venturi (jet) or having the pump located at the bottom of the well no matter how many horsepower the pump motor has. The atmosphere is only pushing so hard at 14.7 pounds or 34 feet water column pressure. And there is the matter of the g-forces (inertia) making it harder for the fuel to flow towards the pump under acceleration. Assuming the pump is forward of the tank. Where I worked municipal water systems, we had wells drawing at the 400' level with the multistage centrifugal pump mounted 400' down with the motor located topside in the pump house. That's right, a 400 foot driveshaft with a 350 horsepower motor at one end, pump at the other end. Its basic high school Physics. But its your fuel system, do what you feel like. [/QUOTE]

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