Will this relay, if it is damaged or becomes faulty, cause the fuel pump to malfunction or cause the fuel pump not to energize? I am currently in the middle of installing a maximum motorsports roll bar in my 1987 Mustang GT. I attempted to start the car, it ran for about 3 seconds then died. I have spark coming from the coil but no fuel pressure. I do not hear the fuel pump energizing. I noticed this relay located underneath the drivers seat.
It can. It really sounds like you may have another issue. I suggest purchasing a service manual and looking up the wiring diagram for the fuel pump. Also borrow or purchase a digital volt meter and start proving out the circuit from the front all the way to the back.