145
FUEL SYSTEM
FUEL SYSTEM TESTS
7
Lift Pump Diaphragm Test
Perform this test only if a damaged pump is sus-
pected. This test does not confirm the perfor-
mance of internal fuel pump check valves.
Remove the pulse hose from the crankcase fitting.
Apply 15 psi (103 kPa) to the pulse hose of the
pump. Replace lift pump if pump fails to hold pres-
sure.
Anti-Siphon Valve Test
Remove anti-siphon valve from fuel tank. Install
adapter fittings and a 36 in. (91.4 cm) length of
clear hose to the inlet side (tank end) of valve.
Fill clear hose with water to a height of 20 in. (500
mm). Water must NOT flow through valve. An
occasional drip is acceptable. Replace valve if
water drips continuously.
Increase height of water to 25 in. (630 mm). Water
should flow through valve as water level reaches
25 in. (630 mm). Replace the anti-siphon valve if
test results are different.
1. Pulse fitting 002334a
1. Anti-siphon valve
2. Adapter fitting
3. Clear hose
DR2277
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