Fuel Pump - Yamaha SRX440 1980 Service Manual

1980 SRX440
Trouble Check point
Remedy
Adjustment
Clogged power jet
Clean
Clogged fuel pipe
Clean or replace
Dirty fuel tank Clean fuel tank
Air leaking into fuel line
Check joint and retighten
low
fuel
pump performance
Repair pump or replace
Clogged fuel filter Replace
Clogged silencer outlet Check for ice.
and remove
Abnormal combustion
lean mixtures Clean carburetor and adjust
(Mainly backfire)
Dirty carburetor Clean carburetor
Dirty or clogged fuel pipe
Clean or replace fuel pipe
Overflow Clogged air vent Clean
(Relative troubles)
Clogged float valve Disassemble and clean
Clean while taking care not to
Power idleing
scratch valve
seat
Poor performance at low.
mid-range. and high
Scratched or unevenly worn Clean or replace float valve Valve seat is press-fitted to body.
speeds
float valve or valve seat and valve seat So body must be replaced if seat is
Excessive fuel consumption
damaged.
Hard starting
Broken float
Replace float
Power loss
Poor acceleration
Incorrect float level
If not within the specified
range. check the following parts
and replace any defective part
• Worn float tang Replace float Replace float assembly.
• Worn arm pin
Replace arm pin
• uerormeo ttoat arm
aeotece neat
.
4-2. FUEL PUMP
Check to see if fuel moves from tank to
carburetor. and if any fuel leaks from pipe
joints or fuel pump body.
Replace fuel pump assembly as required.
1. Fuel pump
4-12