Here’s a diagram for a Hyundai, looks like there might be a round follower that rides the cam:
I do pre-emptive replacements. I never drove in the wilderness except did drive around the state of minnesota with a 300-400,000 mile car. I just carried oil, belt, and a spare computer and coil. I have only replaced two masters and even when they go, you can still hobble along. Original fuel pumps seem to last a long time but replacements, even oem don’t. When a pump goes, my current feeling is to replace the car. Same thing with water pumps. Water pump failures caused the belt to come off. Even though I changed hoses regularly I still had a pin hole develop 150 miles from home. So some clamps and tape and some antifreeze would not be dumb.
I don’t get sick very often, like maybe ten or twenty years, but after a long 800 mile drive once, I also carry an ice cream bucket and some garbage bags. The wife was sick once from Atlanta to Orlando and had to stop to buy garbage bags. Stuff you don’t normally take on a plane. Cars get sick but so do people.
My '74 Volvo had a Bosch electric fuel pump, and–on average–it would die every 14 or 15 months. I got pretty good at being able to replace those pumps quickly, because it was located in the left rear wheel well. Almost everything about that car’s engineering and assembly quality was really bad, but at least they figured out a very convenient location for the fuel pump.
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My prior 70’s vintage VW Rabbit Bosch electric fuel pump located there also. Reliable, never had to replace. Downside to that location, seems dangerous b/c of possible fuel spills. Upside, pump is easy to replace, & easy to check if it is running, just feel if it vibrates.
Back in 74 my boss had a new Volvo. It was back in the shop continuously for various fuel injection problems. Seems like half the engine had to be torn down to get to it. I told him he should have bought an olds as he clamped down harder on his cigar.
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I knew two people who owned '73 Volvos, which were essentially the same as the '74 model. Only after I mentioned my constant, ongoing electrical and mechanical problems did they reveal that their Volvos were lemons. In this case, misery didn’t benefit from having company.