my exploer wont start sometimes why? on 1994 Ford Explorer

My ford explorer will start for awhile just fine then all at once i will drive it somewhere and turn it off and it wont start back for 30 min. the fuel pump is suppose to be new but when it dont start i dont here fuel pump kick on then all at once i hear it and it will happens about every 2 or 3 weeks. my husband thinks its my fuse box under the hood.

Asked by for the 1994 Ford Explorer
ck inertia switch for pwr in and out. i think its inside p/s kick panel. it may be going bad.other than that ck what #1 said
1 more answer
could be a fuel pump relay or a faulty fuel pump I would check wiring going to pump