Fuel gauge inaccurate

[Chuck Banks]

I installed new ACD FLS 1102 fuel pumps and sending unit in my 92. I bought the pumps about 10 years ago from Rock Auto and GM part number is 19180770. The part was still in the box and says made in China. The pumps work great and my 102,500 mile ZR that I?ve owned for 30 years is still performing well.
The fuel gauge starts to drop after driving 25 miles, and hits the reserve with 2 bars showing after 175 miles. I thought I might have bent the float arm when installing the pumps so pulled them but don?t see any problem. Unfortunately I discarded the original pumps so don?t have them to compare with. The ohms read 1.1 with the float at the bottom of travel and 89 ohms at the top. Has anyone else had a problem like this after installing new AC Delco fuel pumps? Any suggestions?
Thanks,

Chuck Banks