2000 Ford Expedition

2000 Ford Expedition V8 Two Wheel Drive Automatic 120K miles

I recently had the fuel pump replaced (aftermarket product). Immediately after, the fuel gauge was initially stuck at 1/4 tank and after several start ups it appeared to " unstick". However, it became apparent soon afterward that it only read between 1/4 tank and 3/4 tank. (Note: the fuel level was at 1/4 tank at the time of replacement.) The mechanic replaced the entire fuel pump (aftermarket again) but the problem persisted. My question is: is the problem in the fuel gauge assembly in the fuel pump, or does " something" need to be adjusted or reset? Thank you.
January 8, 2010.

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