BE58 pilot reported engine and fuel system anomalies after takeoff and returned to departure airport. Plane had just come out of maintenance for fuel cell replacement.

Narrative

Aircraft had just come out of maintenance after the LH wing leading edge fuel cell was replaced (2 other fuel cells were previously replaced and the fuel system had been gone through according to both mechanics previously) and maintenance had inspected the fuel system on the aircraft (LH side fuel system). Runup of the aircraft with the mechanic proved successful and all parameters were in spec according to the mechanic. The aircraft mechanic signed off on the LH side fuel repair and PIC received logbook entries and other association documentation before the flight was to be performed. During taxi all parameters appeared in spec and engine indications in the green. The aircraft had another pre-flight static runup performed before the flight and all engine indications were in the green. After rotation (During takeoff phase of flight) of the aircraft the PIC noticed LH engine EGT's (Exhaust Gas Temperature) rapidly rising to 1500 degrees and the LH engine fuel (GPH) sensor reading lower fuel pressure (approx. 20 GPH at the time) vs. a higher fuel pressure on the RH engine (approx. 25 GPH) RH engine EGT's were only approx. 1200 degrees on takeoff. (as displayed on the aircraft engine indicating system) The aircraft immediately landed back on runway XX at ZZZ as a safety precaution without incident (indications at idle on the taxiway indicated in the green) and the aircraft was able to power itself to FBO where it was parked to be assessed and repaired by maintenance for possible fuel related issues on the LH engine.