Burnt out 2 fuel pump relays?? on 2000 Chevrolet S10

It started with 4-6 cranks befor it started, and then dad. the fuelgage every now and then jumps to empty and then back up. When cold it starts on first crank.

Asked by for the 2000 Chevrolet S10
Blazer?--- IF P/U what engine, 2.2 or 4.3? Need to know, save some guesswork. Trouble codes?
Check engine light on?
Yes is has bin. But driving jesterday it went off and has not come on since. It is a puzzle, and my third bracke-light is the only on working.
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poss electrical system that feeds fuel pump or actual pump and sending unit issues. seek diag and save time and MONEY
Is Fierstone a good place to take it with this problem?