The standard mechanical fuel pumps found on classic cars, are very reliable.
With that said, nothing automotive lasts forever. So, at some point, mechanical fuel pumps will fail.
Firstly, most mechanical fuel pumps, are used on older engines, that have carburetors.
How Mechanical Fuel Pumps Work
Mechanical fuel pumps, siphon fuel from the gas tank. It then pushes it to the carburetor, when the engine is cranking or running.
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Automotive fuses, protect the circuits in your vehicle, from excessive current flow.
So, if an electrical item in your vehicle stops working, the first thing to do is, check the automotive fuses.
Engineers size automotive fuses, for about twice the normal current draw. For instance, if a device normally draws 10 amps, a fuse of roughly 20 amps in size might protect it.
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https://dannysengineportal.com/automotive-fuses-if-any-electrical-item-fails-check-the-fuses-first/

Radiator Caps, are designed to ensure that, the prescribed pressure in the cooling system, is maintained at all times.
And, this is done by allowing air to escape, when pressure exceeds a preset amount.
That’s why, radiator caps should be considered “the safety valve” of the cooling system.
Radiator caps do more than just one thing and therefore, can fail in a verity of different ways.
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https://dannysengineportal.com/radiator-caps-this-fairly-cheap-part-is-more-important-than-you-think/