Is it my fuel pump or main relay?

My car sometimes dies out while driving and won t start but after I let it set for awhile it ll start. It also does it sometimes when I make a quick stop to a store. It s not every time I drive it. When this happens, the check engine light comes on and the fuel pump doesn t kick on and the main relay doesn t click. I ve been having this problem for almost a year and the mechanics can t seem to figure it out.
Does it sound like the fuel pump or main relay?
Will the main relay stop working if the pump is bad?
It s a 1998 Honda Civic LX

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