The Mityvac FST Pro, No. MV5545, helps users diagnose and pinpoint common fuel system failures including failing fuel pump, faulty pressure regulator, blocked filters, pinched fuel line, contaminated fuel, and fuel tank vortex. The tester measures fuel system pressure and flow to accurately pinpoint fuel system failures and can help save troubleshooting time by diagnosing a bad fuel pump and other related drivability problems. The patented system simulates extreme driving conditions in the shop to provide an accurate diagnosis. The tool is capable of testing both return and returnless fuel systems including electronic control, and provides clear visualization of fuel to detect impurities and air bubbles. The kit includes a 3.5” high-pressure gauge with rubber boot, push-button relief valve, and hanging hook; 4’ long pressure test hose; inline pressure test hose with 1/4-turn valve; 37 adapters for connecting to most U.S., European, and Asian manufactured automobiles; a pressure relief hose; custom molded case; and an operator's manual.