Fuel / Exhaust
4.37
Accelerator Pump Testing
On models equipped with an accelerator pump, verify proper accelerator pump operation use the following proce-
dure:
CAUTION:
Wear eye protection when performing this procedure.
1. T urn engine off.
2. Remove air intake silencer.
3. While observing pump outlet nozzle in carburetor
quickly open throttle. A steady stream of fuel
should be evident from each carburetor
accelerator pump outlet nozzle as the throttle is
opened. The pump reservoir must be full of fuel
before performing this test. After operating the
accelerator pump two or three times the reservoir
will be empty and fuel will no longer spray from the
nozzle until the engine is started.
Some causes of improper pump operation are:
S No fuel entering chamber
S Worn pump cam
S Diaphragm damaged or swollen
S Check valve in nozzle stuck open or closed
S Outlet nozzle restricted
S Passages or hoses restricted
outlet nozzle
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