Ski-Doo Formula 500 1998, Shop Manual

Page: 166 / 398

Section 04 ENGINE
Subsection 11 (CARBURETOR AND FUEL PUMP)
04-11-13
REMOVAL
Install a hose pincer (P/N 529 0099 00) on fuel
supply line close to pump inlet.
Disconnect fuel outlet line(s).
Disconnect impulse line.
Remove screws securing fuel pump.
PUMP VERIFICATION
Check fuel pump valves operation as follows:
Connect a clean plastic tubing to the inlet nipple
and alternately apply pressure and vacuum with
pump of leak test kit. The inlet valve should re-
lease with pressure and hold under vacuum.
Repeat the same procedure at the outlet nipple.
This time the outlet valve should hold with pres-
sure and release under vacuum.
NOTE: On model fitted with 2 outlets, plug 1 out-
let with finger while checking outlet valve.
Check impulse diaphragm and gasket on high-
supply fuel pump with twin outlets as follows:
Connect a clean plastic tubing to the impulse nip-
ple and plug vent hole on top cover. Either apply
pressure or vacuum. The diaphragm/gasket must
not leak.
CLEANING AND INSPECTION
The entire pump should be cleaned with general
purpose solvent before disassembly.
Fuel pump components should be cleaned in gen-
eral purpose solvent and dried with compressed
air.
Inspect diaphragm. The pumping area should be
free of holes, tears or imperfections. Replace as
needed.
High-supply pump with twin outlets: Thorough-
ly clean filter on top cover. Replace pump if too
dirty.
INSTALLATION
To install, inverse removal procedure.
A01B2JC
529 0099 00
◆
WARNING
Solvent with a low flash point such as gaso-
line, naphtha, benzol, etc., should not be
used as each is flammable and explosive.
◆
WARNING
Pressure test to ensure there is no leak in
fuel system.