If you take your Rodeo to the dealer, it wil run around $400 to $500. The part is available aftermarket, or from Isuzu. I bought mine from a seller on eBay for around $40.It involves dropping the fuel tank and replacing the unit at the top.The instructions come with it, all parts, and a new O-ring to seal the unit.he fuel pump assembly for a 2000 Isuzu Rodeo with the 3.2L V6  price for a wholesale rune from an economy unit of 84$ to 177$+ for  premium factory grade units. Approximate … labor for this install is  3 hours, although actual time and price will vary by installer.