A failing Cummins PT fuel pump can cause noticeable engine performance issues. Common symptoms include hard starting, unstable idle, loss of power under load, and increased fuel consumption. In severe cases, the engine may surge or stall due to inconsistent fuel pressure.
Because the PT system depends on stable fuel pressure, internal wear, clogged filters, or air leaks on the suction side can significantly affect pump performance. Regular maintenance and timely pump servicing are critical to preventing injector damage and unplanned downtime.
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