well you're looking at 1,110 dollars for a rebuilt vp44 inj pump, exhange, and while u're at it, change that ridiculous lift pump and put a good one on it close to the tank. the vp 44's are lubricated by diesel. The p pump on the 12 valves have their own oil for lubricating. The gas cuts all the lubrivating qualities of diesel. Not sure why u have to drop the tank. Just siphon the gas out, suck the rest out with the lift pump and add diesel. Oh, and the dealer is the worst, expect to pay double on everything! Thats were they make their money, not on selling cars, fixing them. Good luck!