What was found
DURING CLIMB, LT INLET PRESS LOW LIGHT FLICKERED SEVERAL TIMES. AFTER LEVELING OFF, IT CONTINUED TO FLICKER & LT MAIN TANK FEED DOWN TO 8300. IAW QRH TURNED OFF LT MAIN TANK PUMP & LT MAIN TANK QTY STILL DECREASED TO 8200, LIGHT CONTINUED TO FLICKER, TURNED ON PUMPS & DIVERTED. COMPARED FUEL QTY INDICATION WITH FUEL LEVEL INDICATOR STICK TOTALS. INDICATION SYS VARIED TO BE ACCURATE, WITHIN 50 AT A TOTAL FUEL LOAD OF 23,000. TESTED EACH FUEL BOOST PUMP IAW AMM 28-20-07. ALL PUMPS OPERATE NORMALLY. PLACED LT ENG INLET FUEL PRESS LOW ANNUNCIATOR ON MEL 73-03 S1. R & R LT FUEL INLET PRESS SWITCH S1-67 IAW AMM 73-33-01. OPERATIONS CHECKED GOOD, LEAK CHECK PERFORMED, NO LEAKS NOTED.