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The lift pump in my 2016 GC started whining about a week ago...it will be getting replaced this week, as I have no intention of running it until I need a tow truck.A fuel additive isn't going to help the lift pump. The purpose of a fuel additive is to add lubricity to the fuel, which would improve the life of your CP4 pump. The lift pump just needs to stay cool by keeping the fuel level above the 1/4 mark.
The lift pump, similar to the water pump, is a wear item. The idea behind preventative maintenance is to replace these parts before they are known to fail. This isn't easy to do without taking lots of data. I made my 150,000 - 175,000-mile preventive maintenance recommendation based off a reliability-shaped curve. At 150,000 miles, we begin to see lift pump failures on the EcoDiesel. This tells me that the lift pump has reached full-service life at 150,000 miles and the reliability will decrease as more miles are accrued.
The vehicle has 91000 miles on it so I am somewhat baffled by the early demise, but at the same time, not all that surprised .