Toggle switch to shut off fuel pump anti-theft.

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I blew the in line fuse 30amp to my toggle switch, and my van only runs 5 min. each time since about. A green 30amp fuse large in the relay box was corroded but the fuse tester said it was still good, replaced. I put a test light on fuses in relay control center and no light with key on. Fuel pump pressure is less than 60 recent test. Vehicle runs good for 5 minutes. After the fuse blew I drove over 90 miles then the motor was acting to cut out and sounded muffly.