Briggs & Stratton 250000 Specifiche Pagina 99

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3
NOTE: SPECIFICATION TABLES BEGIN ON PAGE 63 OF THIS SECTION.
61
Service Plastic Body Pump,
Disassemble Fuel Pump
1. Remove two screws holding pump to blower
housing.
2. Disconnect vacuum (2), fuel inlet (3) and fuel outlet
(1) hoses from pump, Fig. 158.
3. Remove three screws holding pump together,
Fig. 158.
4. Remove metal pump cover.
5. Remove and discard pump gasket and damping
diaphragm.
6. Remove pump body, diaphragm spring and spring
cup.
7. Remove pump diaphragm from pump base.
Fig. 158
3
2
1
4
Inspect Fuel Pump
1. Check pump body and pump base for cracks or distortion of body. Replace if damaged.
2. Check vacuum and fuel hoses for cracks, softening or hardening. Replace, if any of the above are found.
Assemble Pump
1. Place new pump diaphragm on pump base.
2. Place pump cup and spring in center of pumping chamber, Fig. 158.
NOTE:When doing the next step, hold the pump base with the spring and cup up for ease of assembly.
3. Place pump body on pump base.
4. Place damping diaphragm on pump body and then pump gasket on diaphragm.
5. Install metal pump cover and three screws. Torque screws to 20 in. lbs. (2 Nm).
Service Metal Body Pump
1. To service fuel pump, remove pump from carburetor or mounting bracket.
2. When removing fuel supply line from tank to pump, be sure to plug fuel line or turn off fuel valve, if so equipped.
3. Disassemble fuel pump by removing four 1/4” head cap screws from pump cover.
4. Separate pump cover, pumping chamber and impulse chamber.
5. Discard old gaskets, diaphragms and springs. Clean pump parts in carburetor solvent or lacquer thinner.
A repair kit is available. See Illustrated Parts List. Kit includes all parts needed.
6. Install chamber gasket using locator pins.
7. Place springs (4) in spring recesses and install pump diaphragm on locator pins (Fig. 158).
8. Place pump chamber body on impulse body using locator pins.
9. Place damping diaphragm and cover gasket on pump body.
10. Install cover and four screws.
11. Torque screws to 10 to 15 in. lbs. (1 to 2 Nm). See Fig. 158 for exploded view.
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