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LIFT PUMP or TANK PUMP?

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I still have the lift pump on the side of the engine..so I assume that I do not have the replacement in-tank pump. Is my assumption correct? Its a 1999 5.9 5-speed. Have only 12 psi fuel at idle, 10 at cruise and dropping to 6 WOT at redline. Going with FASS Raptor replacement for my lift pump..assuming not a pump in tank. Thanks for responses. GRT ps I also noticed when i installed my pressure gauge..no presssure till the engine fires...is this normal? thought would have lift pump pressure when key is turned on

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