Fuel System
Fuel System Tests
164
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 inches
(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 inches (630 mm).
Water should flow through valve as water level
reaches 25 inches (630 mm). Replace the anti-
siphon valve if test results are different.
Fuel System Electrical Tests
Fuel system electrical circuits are dependent on
wiring and connections, EMM supplied current
and component resistance. The supplied current
flows through the wiring circuit and component
before returning to the EMM.
Circuit tests check the integrity of the main engine
harness and EMM circuits using a diode test. Con-
tinuity tests check the integrity of ground circuits
and/or the 55V circuit. These tests eliminate the
need to disconnect the engine harness from the
EMM, or remove the EMM.
Vapor Vent Solenoid Resistance Test
Disconnect the battery cables at the battery.
Remove the electrical connector from the vapor
vent solenoid.
Use a digital multimeter with appropriate test
probe leads to measure the solenoid coil resis-
tance.
1. Anti-siphon valve
2. Adapter fitting
3. Clear hose
DR2277
NOTICE
Use appropriate test leads or adapters such
as Test Probe Kit, P/N 342677, when perform-
ing electrical tests.
NEVER pierce the insulation of the engine
wiring, or use any piercing-style test probe.
Piercing insulation damages the wire and can
cause other unintended electrical problems.
Vapor Vent Solenoid Coil Resistance
17 to 23 Ω
@ 72°F (22°C)
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