What was found
PILOT STATEMENT: ON OCTOBER 3RD, I WAS DOING TRAFFIC PATTERNS AT KTOA. WHEN I START THE ENGINE, I NOTICED THAT THE VACUUM PUMP WAS READING LOW (THE INDICATOR WAS POINTING AT THE BOTTOM), BUT IT WASN'T FAILED. I ASSUMED IT'S DUE TO LOW RPM, SO I DECIDED TO CONTINUE TO TAXI TO THE RUN-UP AREA. WHEN I PUSHED THE THROTTLE TO 1800 RPM FOR THE PRE-TAKEOFF CHECKLIST, THE VACUUM PUMP INDICATOR WAS WITHIN THE GREEN RANGE, EVERYTHING ELSE WAS READING NORMAL. THUS, I APPROACH THE HOLD SHORT LINE AND WAIT FOR TAKE-OFF CLEARANCE. HOWEVER, WHEN I PUSH THE THROTTLE TO 2700RPM, THE VACUUM PUMP INDICATOR SPIKES ALL THE WAY TO THE TOP. I IMMEDIATELY ABORTED THE TAKE-OFF AND HEADED BACK TO PSA. I TALKED TO MY INSTRUCTOR AND ANOTHER INSTRUCTOR AFTER, AND THEY SAID IT SHOULD BE FINE TO FLY. SO, I GOT BACK INTO N2060U AND DID ONE SOLO TRAFFIC PATTERN AT KTOA. 10/25/2020 LEFT VACUUM PUMP REPLACED WITH RAPCO PN215CC.