Hi,

How many miles do think is on the main pump?
I ask because it has been my experience that around 200,000 the pumps are nearest the end of life for brush wear.
An intermittent failure to start up is a warning sign.

If the main pump has run for any extended length of time with a failed feed pump you take another 20, 000 off the life of it.
Of course this all varies depending on how much the fuel level in tank was above the half way point during its whole life time. The in-tank pump helps compensate for variances in that area.
A sign of a failed in-tank pump can be attributed to a lengthening cranking time especially the closer to empty.
The orange zone on the fuel gauge is on there for a reason to help keep nearly two gallons in the tank.
Across the bottom of the tank it is not very deep.
One for a warning of driving space and one for the pumps! Don’t borrow from the pumps.

I think I have read that a new pump setup (both included) probably draw about 8 or 9 amps of which is not more than the wires can handle to it the pump. But you are right, the connection terminals on the relay can be another indicator. They can get relaxed somewhat from the heating and cooling.
As wear some corrosion preventative paste helps to dissipate heat to some extent.
With it, Surface contact to the surrounding air is increased slightly.

But even more it helps keep the green gremlins from intervening depending on where you live.
I’m suspicious that if there are green trees 🌲 or salty air in your area, you may have some immigrating relatives from Ireland traveling about.
Along with Ireland’s lore and antics I give them more credit, cheerfully, than I would normally. 😳🤔

Have a nice day with a grin!

Phil