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Mariner Mercury 135 JET User Manual

Mariner Mercury 135 JET
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90-824052R3 JUNE 2002 FUEL SYSTEMS - 3B-23
Fuel System -
Troubleshooting
General Information
Problems, that are thought to be caused by the fuel
system, may be, in reality, something completely
different. Items, that are shown in the list on the right,
could give the impression that there is a problem in
the fuel system.
1. Propeller
2. Spark plugs
3. Ignition timing
4. Ignition spark voltage
5. Cylinder compression
6. Reed valves
Problem: Engine Turns Over But Will Not Start Or Starts Hard When Cold.
Possible Cause Corrective Action
Improper starting procedure used.
Check proper starting procedure, as outlined in “Op-
eration and Maintenance Manual.”
Fuel tank empty or too low. Improperly mixed fuel.
Contaminants (water, dirt, etc.) in fuel
Check fuel in fuel tank and replace or add whichever
is necessary.
Fuel tank air vent closed or restricted. Check air vent on fuel tank. Air vent must be open
all-the-way and free from any contaminants.
A pinched, cut or restricted fuel line. Also loose fuel
line connection.
Check all fuel lines and replace as needed. Check
and tighten all fuel line connections.
Dirty or restricted fuel filter. Check and replace or clean all fuel filters.
Low fuel pump pressure. Refer to Section 3A.
An anti-siphon valve. Refer to “Checking for Restricted Fuel Flow” in this
section.
Choke solenoid, or enrichment valve not operating. Check choke solenoid or valve, and electrical wiring
to solenoid or valve. Replace if necessary.
A needle and seat (in carburetor) that is either stuck
open or closed. Open=Flooding - Closed=Starving
Refer to “Carburetor Disassembly” in this section.
Improper carburetor jets, restricted jet or idle mixture
screw out of adjustment.
Refer to “Carburetor Adjustments” in this section.
Improper carburetor float level. Refer to “Carburetor Adjustments” in this section.
Problem: Engine Idles Rough and Stalls.
Problem: Engine Hesitates Upon Acceleration.
Problem: Engine Runs Uneven or Surges.
Possible Cause Corrective Action
Improperly mixed fuel. Contaminants (water, dirt,
etc.) in fuel.
Check fuel in fuel tank and replace if necessary.
Fuel tank air vent closed or restricted. Check air vent on fuel tank. Air vent must be open
all-the-way and free from restrictions.
A pinched, cut or restricted fuel line. Also loose fuel
line connection.
Check all fuel lines and replace as needed. Check
and tighten all fuel line connections.
A dirty or restricted fuel filter. Check and replace or clean all fuel filters.

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Mariner Mercury 135 JET Specifications

General IconGeneral
BrandMariner Mercury
Model135 JET
CategoryEngine
LanguageEnglish

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