Mariner Mercury 105/140 JET, Service Manual

Page: 240 / 797

90-824052R3 JUNE 2002 FUEL SYSTEMS - 3C-33
Procedure B: STEP 1: Connect EFI tester. Steps
outlined in electrical system and ECM
check.
STEP 2: 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.
STEP 3: Perform fuel injector test procedures
(outlined) while depressing remote
starter switch.
Results B: If fuel spray is present using EFI tester,
but not present while cranking, perform
switch box DVA tests Section 2A (1, 3, 5
switch box failure).
If fuel spray pattern is equal on all injectors system is
functioning normally.
Induction Manifold Leak Check
(Manifold Cover Removed)
Purpose: Lack of good fuel pressure may be caused
by an internal leak in the fuel induction man-
ifold and not caused by a weak pump. This
test eliminates the possibility of induction
manifold leaks as a probable cause.
WARNING
Do not start engine with induction manifold
cover removed. Disable ignition system prior to
performing this test.
WARNING
Operation of EFI system with cover removed can
allow fuel to spray components. Be extremely
careful when operating the fuel system in this
condition.
Procedure: STEP 1: Remove induction manifold
cover using procedures outlined under
“Induction Manifold Removal.”
STEP 2: Reattach manifold body without cover to
engine using twelve 1/4-20 x 2-3/4
″
screws in place of screws normally used.