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I have a 1994 Nissan Sentra XE 1.6L car. I had the fuel pump replaced and now the gauge is only reading at about a 1/4 of a tank when full. Is it possible to damage the sending unit when replacing the fuel pump? I believe the sending unit has a float that extends out from a sealed unit. Could the damage result from the float lever being improperly handled?

Yes, it is possible it was damaged when the pump was replaced. Remember it is a 10 year old car and these parts are submerged in gasoline. The part itself is not real expensive nor that hard to change or inspect. Remove your back seat and the “fuel pump inspection cover” is visible to access the fuel pump and sending unit. It is possible that it MAY have been installed incorrectly and the float is unable to "float". The part number of the float assembly is #2506057Y02. Your local Nissan dealership is the place you must contact to order the correct sending unit. If it is damaged don't be too hard on the shop that changed the fuel pump. I tell my customers that when we change a fuel pump the sending unit MAY become damaged because we are moving it around, and it has become fragile after so many years submerged in gasoline.

 

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