Welcome to SCoA.
Really not enough details of “Major Problems” to respond to your post without - mileage, codes shown & history of mechanical issues prior to fuel pump failure?
Wouldn’t turn over - seized up or battery (age?) won’t crank? How long have you owned your Brabus?
Unfortunately 20 year old vehicles can become a drain on your wallet especially a niche foreign brand with no dealer network stateside.
With just a few more specifics this Forum of “smart” enthusiasts stand at the ready to help a fellow owner...