1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 63Get this manual
5If your reading is greater than inHg, you must test each boat fuel system component for excessive restriction before continuingRefer to Boat Fuel System Recommendations, this section, for component descriptions rn 6If you tests
suspect the anti -siphon valve, perform these
Remove anti-siphon valve from fuel tank and install adapters and appropriate size clear hose as shown Fill clear hose with water until "X" dimension is 20 in(500 mm)Water must not run through valve Increase water level until "X" dimension is 25 in(630 mm)Water must begin to run through valve before reaching 25 in(630 mm) Replace the anti-siphon valve if your test results are different7If your reading is less than inHg and air bubbles are visible in the clear hose, check entire boat fuel system for air leaksRepair leaking connection Transparent Hose Adapters Tank End Anti-Siphon Valve Engine End
INote An
air leak into fuel supply system may not create visible fuel leak until engine is turned off and fuel system is pressurized by the heat of the sun 8If your reading is less than inHg and no bubbles are visible, move the clear hose to the output side of the inline fuel filter Start engine and run at full throttle If bubbles appear, test inline fuel filter If no bubbles appear, go to Step 99If no bubbles appear in Step 8, remove the clear hose and install 0-15 PSI (0-103 kPa) fuel pressure gauge between pump and carburetors10Start engine and run at 800 RPM in gearAfter fuel pressure stabilizes, the pressure gauge must not indicate less than PSI (21 kPa) when held level with VRO fuel outlet fitting If pressure is less than PSI (21 kPa), test pulse limiterRefer to Pulse Limiter Servicing, this sectionCheck if fuel pump retaining screws are tight, and check pump gasket condition If pulse hose and pulse limiter are good, or fuel pump mounting is secure, and pressure is less than PSI (21 kPa), See Fuel Pump Testing or VRO Pump Trouble Check Chart, this section