Engine Performance problem
1991 Nissan Truck 4 cyl Two Wheel Drive Manual 146000 miles
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I have a 1991 Nissan Truck with the ka24e engine. When the truck starts to move the fuel pump begins to whine. When the pump does whine the truck will bearly rev up past 2000 rpms, and when it does it spits, sputters and coughs. There is an intermitten miss at the idle speed no matter the engine temp. I have replaced the fuel pump, injectors, pressure regulator. I have also checked the ignition module and coil. The truck is no longer throwing any diagnostic codes. The codes it did throw were for the ignition coil (fixed), temp sending unit (cleaned), the Air flow meter (fixed). The truck acts like it is loosing vaccuum, but all of the vaccuum lines are intact and do not leak. Please help. I am about ready to shoot the truck!!!

Hi phelpske367,

If the fuel pump whines then most probably it is not getting enough fuel to run through it or sucking air together with fuel.

Is this an external pump?

Check for leakage from fuel source to pump or a clogged fuel tank vent system.