Answer
First of all, be sure that this is the real problem. a diesel fuel pump replacement is extremely expensive. there are diesel pump rebuilders, specializing in bosch fuel pumps, but you will have to look them up in the yellow pages. first i would try to have your fuel system purged and cleaned if this car is high mileage. you make no mention of the year or mileage. usually, the factory pump will last for over 250,000 miles, unless it has rusted internally from water or bad fuel. if you are extremely lucky, the cleaning procedure will do a lot of nice. there is a product for this called diesel purge, made by lubro-moly of germany. it is like a tune up in a can. also, poor engine compression may act like a weakened fuel pump. have things tested out.