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I tried 1/2" lines from the pump to the fuel canister with the stock (in tank) LP and the fuel pressure just dropped to about 1 PSI upon start-up. With the stock lines it was showing 11-12 PSI at idle, and with the Raptor and the 1/2" line its around 16-18 PSI.
Do not waste your time or money looking for band-aid fixes, do it right the first time and get a Airdog/Raptor or FASS unit, they are worth every penny.
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