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Engine quits at speed..electrical vs. fuel system?

Fuel System

Vehicle Information: Year: 1989; Engine (Size, Modifications): 3.3L turbo unmodified; Total Mileage: 22000;

This problem persists even after both fuel pumps, fuel distributor, and assorted relays have been replaced. Car can be running well and then suddenly dies at any speed. Mechanic states fuel pumps are drawing 16 amps causing relay to trip and fuse to blow. He has added additional grounding to chassis, which he states has lowered amp draw to around 14 (states 12 is normal). Now he is concerned that fuel lines may have too much "resistance" and may be also causing fuel pumps to draw too much current. Any suggestions would be greatly appreciated.

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