Without the residual pressure, you have no accumulator. It's a reservoir. I would pressurize it with air after assembly and let is sit until the car is ready to fire. It should hold pressure indefinitely. I utilized mine for a couple years and it never lost any pressure and I had the clamps in the wrong place on purpose. It's fine as long as you don't over tighten. I would put them in the right spot if circumstance allowed.
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Todd
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