Will 98 regal ls fuel pump work for gs?

While both the Buick Regal GS and LS share some components, it's not guaranteed that a fuel pump from a 98 Regal LS will work in a 98 Regal GS. Even if the engines are the same displacement, there might be differences in fuel system pressure, wiring harnesses, or pump mounting that could cause incompatibility.

To be absolutely sure, you should:

* Check the part numbers: Compare the fuel pump part number from your GS with the part number of the LS fuel pump you have. If they match, it's more likely to be compatible.

* Consult a parts catalog: Use a reputable online parts catalog (like RockAuto, AutoZone, etc.) and look up the fuel pumps for both the LS and GS models. This will show you the correct part numbers and potential variations.

* Consult a mechanic: A qualified mechanic will be able to definitively tell you if the fuel pump is compatible based on your vehicle's specific information.

Don't assume compatibility based solely on the model names. It's best to verify the compatibility before installation to avoid potential problems.