Mercury 150 EFI User Manual

FUEL INJECTION
90-883728 JULY 2001 Page 3B-17
EFI Fuel Management (Low Pressure Fuel Route)
• Install fuel pressure gauge on to VST pres-
sure port.
• Place ignition switch in “OFF” position 30 sec-
onds before testing.
• Place ignition switch in “ON” position and
note pressure within 30 seconds (41 to 45 psi;
283 to 310 kPa).
No or low fuel pressurePump does not run
Fuel pressure above 45 psi (310 kPa)
Perform Vapor Separator Fuel
Delivery Test .
Follow High Pressure Fuel
Route Flow Chart.
Follow High Pressure Fuel
Route Flow Chart.
No or little fuel flow from vapor
separator.
Fuel flows freely from vapor
separator.
Follow High Pressure Fuel
Route Flow Chart.
Inspect float system of vapor
separator.
Perform Water Separating Fil-
ter Flow Test.
Low or no fuel flow from water
separating inlet hose. Reconnect
hose.
Fuel flows freely from water separat-
ing filter inlet hose. Reconnect hose.
Perform Pulse Fuel Pump De-
livery Test.
Replace water separating filter.
Fuel flows freely from pulse
pump inlet hose.
No fuel flow to pulse fuel pump.
See pulse pump removal and
inspection section 3A. Locate
all fragments of failed pump
before reassembly.
Check for restrictions, holes or loose
connections from fuel supply.
Results Results
Results
Results
ResultsResults
Check fuel/water separator.

Mercury 150 EFI Specifications

General

Brand	Mercury
Model	150 EFI
Category	Engine
Language	English