Yamaha F50 Service Manual
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62Y3A114-2 1 2 3 4 5 6 7 8 I Hose routing4 Fuel and blowby hoses 1Blowby hose 2Hose (acceleration pump-to-carburetor) 3Fuel hose (fuel joint-to-fuel filter) 4Fuel hose (fuel filter-to-fuel pump) 5Fuel hose (fuel pump-to-carburetor) 6Hose (carburetor-to-carburetor) Special service tools / Hose routing
FUELFuel system 4-362Y3A11 Cooling water hose ÈModels with flushing device
62Y3A114-4 1 2 3 4 5 6 7 8 I — MEMO — Hose routing
62Y3A114-6 1 2 3 4 5 6 7 8 I No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Fuel joint 1 2 Fuel filter 1 F50/F50A 3 Fuel filter 1 T50/FT50B, FT50C 4 Fuel pump 1 5Bolt 1 M6 × 25 mm 6 Seal 1 7 Fuel hose 1 Fuel joint-to-fuel filter 8 Clip 3 9Bolt 1 M8 × 14 mm 10 Nut 1 11 Bracket 1 12 Fuel hose 1 Fuel filter-to-fuel pump 13 Fuel hose 2 Fuel pump-to-carburetor 14 Clip 3 15 Bolt 2 M6 × 30 mm 16 O-ring 1 Not reusable Fuel line
FUELFuel system 4-762Y3A11 Fuel filter and fuel pump4
62Y3A114-8 1 2 3 4 5 6 7 8 I È F50/F50A É T50/FT50B, FT50C No. Part name Q’ty RemarksTightening torques Stage N·mkgf·mft·lb 1 Fuel filter cup 1 2 O-ring 1 Not reusable 3 Fuel filter element 1 4 Body 1 5Float 1 6 Screw 4 M5 × 35 mm 7 Cover 1 8 Fuel pump body 2 1 9 Fuel pump body 1 1 10 Nut 4 11 Plunger 1 12 Spring 1 13 Spring 1 14 Pin 1 15 Diaphragm 1 16 Screw 2 M3 × 6 mm 17 Valve 2 18 Nut 2 19 Seal 1 Not reusable 20 Gasket 1Not reusable Fuel filter and fuel pump
FUELFuel system 4-962Y3A11 Checking the fuel pump 1. Install the special service tool onto the fuel pump as shown. 2. Apply the specified pressure to each fuel pump port. 3. If air flow is reversed, check the dia- phragm for tears and the valves for cracks. Replace if necessary. CAUTION: Do not over pressurize the fuel pump, oth- erwise excessive pressure may cause air leakage. NOTE: Make sure that air does not escape from the opposite side of the fuel pump. To eliminate any gaps between the fuel pump valves and the fuel pump body 2, and to ensure a better seal, make sure that the inside of the fuel pump is moist with gaso- line. Disassembling the fuel pump 1. Disassemble the fuel pump as shown. Pressure/vacuum tester: YB-35956-A Vacuum/pressure pump gauge set: 90890-06756 Fuel pump pressure a : 50 kPa (0.5 kgf/cm 2, 7.1 psi) Fuel pump negative pressure b : 30 kPa (0.3 kgf/cm 2, 4.3 psi)
62Y3A114-10 1 2 3 4 5 6 7 8 I 2. Push down on the plunger and the dia-phragm, turn the fuel pump body 1 1 approximately 90 ° to a position where the pin 2 can be removed easily, and then remove the pin. 3. Slowly let up on the plunger and dia- phragm, and then remove them. Checking the diaphragm and valves 1. Check the diaphragm 1 for tears and the valves 2 for cracks. Replace if neces- sary. Assembling the fuel pump 1. Align the plunger and diaphragm installa- tion holes a , and then install the plunger into the diaphragm. 2. Push down on the plunger and the dia- phragm, and then install the pin 1 . 3. Turn the fuel pump body 1 2 approxi- mately 90 °, and then push down on the plunger several times to make sure that the pin does not come out. 4. Assemble the cover 3 , gasket 4 , and seal 5 with the screws 6 , and then install the fuel pump. S62Y4120 1 2 S62Y4160 6 3 4 5 LTLT 572 Fuel filter and fuel pump