Mercury Optimax 115

3
A
FUEL PUMP
90-855347R1 JANUARY 1999 Page 3A-1
FUEL SYSTEM
Section 3A – Pulse Crankcase Driven Fuel Pump
Table of Contents
Specifications 3A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump Pressure @ W.O.T. 3A-1. . . . . . . . . . . . . .
Fuel Pump Pressure @ Idle 3A-1. . . . . . . . . . . . . . . .
Special Tools 3A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump 3A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump Description/Operation 3A-3. . . . . . . . . . . . . .
Checking for Restricted Fuel Flow Caused by
Anti-Siphon Valves 3A-4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing Fuel Pump 3A-5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump Removal/Disassembly 3A-6. . . . . . . . . . . . . .
Cleaning/Inspection 3A-7. . . . . . . . . . . . . . . . . . . . . . . .
Reassembly/lnstallation 3A-7. . . . . . . . . . . . . . . . . . . .
Specifications
Fuel Pump Pressure @ W.O.T.
Maximum – 10 psi
Normal – 8-10 psi
Minimum – 3 psi
Fuel Pump Pressure @ Idle
Normal – 2-3 psi
Minimum – 1 psi
NOTE: Electric fuel pump pressure, if used in conjunction with engine mechanical fuel
pump, must be limited to no more than 4 psi.
Special Tools
1. Fuel Pressure Gauge (0–15 psi) (Obtain Locally)