Will a 94 S10 fuel tank fit 97 S10?

While both are S10s, there's a chance the fuel tanks aren't directly interchangeable between a 1994 and a 1997 model. The fuel tank shape, mounting points, and even the fuel pump assembly could be slightly different due to design changes over those three model years.

It's best not to assume compatibility. You should check the part numbers for the fuel tanks or consult a parts catalog (like a website like AutoZone, Advance Auto, or RockAuto) to confirm whether they are indeed the same. Failing that, contact a local parts store or mechanic for verification.