Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
The fuel pumps are in line and not in the tank, to tell you exactly where I would need the engine model number. Sometimes they are easy enough that a person with basic tools and basic knowledge can in fact replace themselves, however it is proper diagnosis that can save from replacing incorrect parts and spending too much in repairs. As well as knowing common problems and tricks. For price and lets say it's one that has pump in with cooler and that is the one that is bad, for rough non specific prices your normally looking between $200-$500 depending on if also replacing the cooler and any other parts.
Again, once I have the model number of the engine I can give you exact specific info related to your engine.
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