Suzuki outboard motors 1988 2003 repair manual., Page 110Get this manual
4-48 FUEL SYSTEM rotor, rollers and housing will alternate, first larger, then smallerThis space variation is utilized for fuel suction and feed pressureResidual pressure check valve check valve is provided to keep residual pressure in the fuel line after the engine has been shut offRelief valve relief valve is provided to prevent overpressure in the highpressure side of the fuel lineSuction filter To prevent fuel tank or sediment from entering the high-pressure fuel pump, there is fine mesh suction filter at the pump inletThe following special tool must be obtained to perform the fuel pump power supply check: 2-pin connector test cord (09930-89210) 2Connect the multimeter positive probe to the pink test cord lead and the multimeter negative probe to ground3With the tester set on DC volts, fuel pump voltage should measure approximately 12 volts (battery voltage)To perform the fuel pump second operating signal check, connect the multimeter positive probe to the pink test cord lead and the tester negative probe to the black test cord lead4Turn the ignition switch to the ON position and measure the voltageVoltage should measure approximately 12 volts (battery voltage) for seconds only Excepting the first second after the ignition switch is turned ON, the tester must indicate voltageIf not, the pump has failed and needs to be replacedTESTING
Fuel Pressure
1Obtain the following special tools: Fuel pressure gauge 3-way joint and hose Fuel pressure hose 2After following the procedures for relieving the fuel pressure in the fuel lines, connect the jointhose and gauge as shown in the illustration3Use 50:l fueloil mixture for pressure testing4Turn the ignition switch to the ON and OFF positions several times to activate the high pressure fuel pump and fill the fuel hoses with fuel5Inspect all the fuel line connections for leaks and correct any problems before proceeding with the tests6Check if the fuel pressure indicated on the gauge is within specification at both idle speed and cranking speed To prevent damage to the starter motor, do not crank the engine for more than 20 seconds at time5To perform the fuel pump operating signal check, crank the engine with the spark plugs removed and check the voltage6The fuel pump operating signal should be approximately 9-10 volts during cranking7Fuel pressure should be approximately 36.3 psi (2.55 kgIcm2)8If the fuel pressure is not within specification, recheck all the fuel line connections for leaksIf there are no leaks, replace the fuel pump assembly Residual Fuel Pressure