Fuel Filters & Separators; Fuel Transfer Pump; Anti-Siphon Valve; Fuel System Diagrams - Maxum 3700 SCR Supplemental Owner's Manual

20 Chapter 2: Components/Systems
Fuel Filters & Separators
Fuel filters and separators should be inspected periodically for debris and replaced according to the guidelines and
instructions detailed in your engine manual, (optional) generator manual and in the filter literature.

Fuel Transfer Pump

If your yacht is diesel powered, it is equipped with a fuel transfer pump. The fuel transfer pump is activated by a
switch at the helm and is used to draw fuel from a full tank to a nearly empty tank.
ENVIRONMENTAL HAZARD! NEVER transfer fuel into a full (or nearly full) fuel tank. Fuel
transferred into a full tank may spill overboard through the tank venting system.

Anti-siphon Valve

If your yacht is gas-powered, it may be equipped with an anti-siphon valve. An anti-siphon valve is an integral part of
the gas fuel line barb fitting on each fuel tank. These valves are spring loaded and are opened by fuel pump vacuum.
In the unlikely event of a fuel line rupturing, the valve would prevent fuel from siphoning from the tank.
FIRE & EXPLOSION HAZARD! If an engine problem is caused by fuel starvation,
check the anti-siphon valve. If the valve is stuck or clogged, shut down the engine and
replace it. Except in a crisis, never operate the engines without the anti-siphon valve.

Fuel System Diagrams

DIESEL ENGINES WITH OPTIONAL GENERATOR
PORT FUEL TANK
VENT
PORT ENG. RETURN
SENDER
PORT ENG. PICKUP
FUEL FILL
FUEL SHUT-OFF VALVE
FUEL
FILTER
GEN.
PORT
ENGINE
37OO SCR Sport Yacht
!
!
STARBOARD FUEL TANK
VENT
GENERATOR RETURN
STBD. ENG. RETURN
SENDER
GENERATOR PICKUP
STBD. ENG. PICKUP
FUEL FILL
FUEL SHUT-OFF VALVE
FUEL
FILTER
STARBOARD
ENGINE
FUEL
FILTER
FUEL SHUT-OFF VALVE
•
Owner's Manual Supplement
CAUTION!
WARNING!
GAS ENGINES WITH OPTIONAL GENERATOR
PORT FUEL TANK
VENT
PORT ENG. RETURN
SENDER
PORT ENG. PICKUP
FUEL FILL
FUEL SHUT-OFF VALVE
PORT
ENGINE
STARBOARD FUEL TANK
VENT
GENERATOR RETURN
STBD. ENG. RETURN
SENDER
GENERATOR PICKUP
STBD ENG. PICKUP
FUEL FILL
FUEL SHUT-OFF VALVE
GEN.
FUEL SHUT-OFF VALVE
FUEL
FILTER
STARBOARD
ENGINE