I only replaced mine because it had started leaking and depending on if the car was running or sitting either allowing air into the system or dripping on my garage floor. Mine was the original up until this change over. When my old one was unscrewed the plastic shaft inside the unit almost fell out completely!

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1980 Mercedes 300SD
Miles unknown, something north of 276K

Maybe I'm anal amount how I change filters. I was taught to do it in 2 stages:
1. Remove main filter, fill with transmission fluid, start, let run - rarely get any stumble in engine.
2. Change small primary - start, let run - rarely get any stumble.

I've never changed both without starting in between - never had a problem. Never used the pump - had the car 25 years.

I also always refuel ASAP at 1/4 tank. Never ran out.

Charles

I am going to bend and grind down, if needed, a set of wrenches tomorrow. I have a new gasket and a case of beer waiting for me in the garage fridge. Well the beer is in the fridge, the gasket is in the car.

I sometimes run a quart of tranny fluid in the gas tank, seems to help dissolve some of the deposits in the engine.

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1980 Mercedes 300SD
Miles unknown, something north of 276K

I doubt anyone runs out of fuel on purpose. Were your gauge to fail, and you not be aware until you sputter to a halt on the side of the road, you'd be happy you have a non leaking primer pump.
The gauge has failed in two of the five MB's I've owned.
The only problem I encountered was on the interstate at 3:30am, Christmas.

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83 SD

84 CD