Mercury V8 300 User Manual

Fuel System
Section 7B - Troubleshooting and Diagnostics
Table of Contents
Fuel Component Troubleshooting and Diagnostics........... 7B-2
Antisiphon Valves....................................................... 7B-2
Fuel Supply Module (FSM)......................................... 7B-2
Fuel Lift Pump ............................................................7B-2
High‑Pressure Fuel Pump.......................................... 7B-3
Fuel Pressure Calculations, Engine Running............. 7B-4
Fuel Injector Resistance Test..................................... 7B-4
Wire Color Code Abbreviations.................................. 7B-5
Fuel Injector Circuits................................................... 7B-6
Troubleshooting and Diagnostics
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 7B-1
7
B

Mercury V8 300 Specifications

General

Horsepower	300 HP
Displacement	4.6 L
Full Throttle RPM Range	5200-6000 RPM
Fuel Induction System	Electronic Fuel Injection (EFI)
Gear Ratio	1.75:1
Starting	Electric
Shaft Length	20 in, 25 in, 30 in
Warranty	3-Year Limited Warranty
Engine Type	V8
Fuel Type	87 Octane
Bore x Stroke	92 mm x 86 mm