The hoses shouldn't be THAT soft. They could be sucking closed and causing problems, as they are on the suction side of the pump. The lines should be steel..copper has a tendency to vibrate and break. As long as they aren't pinched shut I wouldn't worry about the steel lines. Pipe tape shouldn't be necessary if the ends are FLARE fittings, which they SHOULD be! If they leak without the tape, try taping them. Better yet, reflare the ends.
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