My 99 Taurus is in need of a new fuel pump, so I have been comparing prices online. I plan to replace the whole assembly since its all 12 years old. I found a few things that confused me a bit though. First it seems some of the Taurus have different size fuel tanks. How do I know which I have I know its a Duratec, no Flex Fuel. Also, I checked rockauto, and it gave me part number PFS235 for the Motorcraft pump, and PFS237 if it were a Vulcan, however every other brand was the same pumps for both. Also, on Motorcraft.com i found PFS235 but also PS112 for way cheaper. What's the difference. Last, I found a great deal on a new PFS199 pump from a 02 Taurus. Will an 02 pump fit a 99?