Mercury 20 EFI FourStroke

Special Tools
Fuel Pressure Gauge Kit 91‑881833A03
2807
Tests the fuel pump pressure; can be used to relieve fuel pressure.
Dual Fuel/Air Pressure Gauge Kit 91‑881834A 1
5822
Tests fuel and air pressure; the dual gauges allow the viewing of both pressures
simultaneously.
Clamp Tool 91‑803146T
39648
Used to clamp high‑pressure (Oetiker®) hose clamps. Part of Clamp Tool Kit
(91‑803146A04).
DMT 2004 Digital Multimeter 91‑892647A01
A
C O
M
m
A
V H z
mV
V
H z TEMP
m A
A
IG
IP
OFF
H z
TEMP
4516
Measures RPM on spark ignition (SI) engines, ohms, amperes, AC and DC
voltages; records maximums and minimums simultaneously, and accurately
reads in high RFI environments.
Fuel System Specifications
Parameter Specification
Fuel system Computer‑controlled split‑sequential multiport electronic fuel injection
Fuel type
Automotive unleaded with a minimum pump posted octane rating of 87 (R+M)/2 (90 RON);
up to 10% ethanol
Fuel pump type
Mechanical plunger (diaphragm) +
Electric high pressure
Fuel pump pressure (mechanical) 30 kPa ± 20 kPa (4.3 psi ± 2.9 psi)
Fuel pump pressure (electric) 256 kPa ± 25 kPa (37.1 psi ± 3.6 kPa)
Service Procedures
Page 3C-2 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017