Fuel System - Fuel/Water Separator, Fuel Lift Pump, Fuel Filter; Fuel Filter Replacement - Beta Marine Beta 43 Operator's Maintenance Manual

Fuel System
Important
• Always fit a fuel/water separator in the fuel supply
system. Water in the fuel can seriously damage the
injection system.
• If a fuel supply shutoff valve is fitted do not use a taper
tap, only use a ball valve tap. The ball valve type are
more reliable and less likely to let air into the fuel system.
• Be sure to use a strainer when filling the fuel tank. Dirt or
sand in the fuel may cause trouble in the fuel injection
pump.
• Always use diesel fuel. Do not use paraffin / kerosene,
which is very low in cetane rating, and adversely affects
the engine.
• Bio-diesel fuel can be added to the normal diesel fuel up
to a maximum limit of 5% without affecting the warranty.

Fuel Filter Replacement

1. The fuel filter is a spin on type. Remove by turning anti-
clockwise when viewed from below.
2. Replace the fuel filter cartridge every 750 hours or every
2 years. See photo 21.
3. Apply fuel oil thinly over the gasket and tighten into
position - hand tight.
4. Bleed as detailed - see 'initial start up'.
5. Check for leaks.
6. Do not get fuel on the flexible mounts, this will degrade
the rubber.
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• We know that some customers are using 100% Bio-
diesel fuel, Important; Beta Marine warranty will not
cover fuel equipment when more than 5% Bio-diesel is
used. If you use Bio-diesel fuel you must fit an electric lift
pump into the fuel supply line and the fuel filter and oil
filter must both be changed together when the oil filter is
normally replaced.
• Be careful not to let the fuel tank become empty, or air
can enter the fuel system, necessitating bleeding before
next engine start.
• The fuel lift pump will only lift fuel through 0.25m.
If this is insufficient then an electric fuel lift pump must
be fitted. Drawing 202-06421, illustrating recommended
wiring for this pump can be supplied upon request.
21
Heat Exchanger Cooled
Fresh water circulates through the engine and on to a heat
exchanger where it is cooled by sea water which is pumped
through the cooling tubes. The sea water is then injected into
the exhaust system (see diagram).
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