90-824052R3 JUNE 2002 FUEL SYSTEMS - 3D-37
3. Connect a jumper wire between the metal case
of ECM and a good engine ground.
WARNING
If a serious leak is present in the induction man-
ifold, fuel may spray out of bad seal. Have clean
up rags available to remove excess fuel from
components.
4. Place emergency stop switch in OFF position to
prevent engine from starting. If boat is not
equipped with a emergency stop switch, connect
a jumper lead from the BLACK/YELLOW termi-
nal on the switch box to engine ground.
5. Connect remote starter Quicksilver
(91-52024A1) to NEGATIVE terminal of electric
fuel pump and a good engine ground. Depress
remote start switch, pump will operate as long as
switch is depressed.
WARNING
Do not operate pump for more than 20 seconds
continuously.
55197
6. Look for leak points on induction manifold while
depressing remote starter switch.
Results: If no leaks are present, replace cover and
gasket using normal length screws.
If fuel leak is present between sealing surfaces,
rebuild system using new O-rings.
Air Temperature Sensor Test
Purpose: This test eliminates possibilities of
improper fuel delivery related to air
temperature sensor.
1. Disconnect and remove Air Temperature Sensor
from induction manifold.
2. Connect digital meter set at “20K scale” (from EFI
Tester P/N 91-11001A2) to leads of sensor.
3. Place sensor in ice water while monitoring meter
reading. Use graph (below) for reference.
NOTE: Temperature/resistance reading may differ
slightly from graph curve.
SENSOR RESISTANCE VS. AIR TEMPERATURE
AIR TEMP. SENSOR RESISTANCE (K OHMS)
Results: Resistance does not change inversely with
temperature change. Replace defective Air
Temperature Sensor.
Resistance changes inversely with temperature
change. Air Temperature Sensor OK.
Engine Head Temperature Sensor
Test
Purpose: This test eliminates possibilities of
improper fuel delivery related to the water
temperature sensor.
1. Disconnect and remove Engine Head
Temperature Sensor (see page 3D-44).
2. Connect Digital Meter set at “2K Scale” (from EFI
Tester P/N 91-11001A2) to bullet leads of sensor.
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