Regal 53 SC Owner's Manual page 63

POSSIBLE FUEL PROBLEMS/SOLUTIONS
1. Engines are hard to start or rough
running- This problem may be caused by
air in the fuel system or a restriction in the
fuel supply which causes a lean condition.
Check all fuel system lines, clamps, fi ttings
and fi lters for tightness. Prime and bleed the fuel fi lters
if necessary.
2. Fuel fi lter elements contain "algae" or exhibit a
brown or black color and/or show water in the fuel
system.
Check fuel tank for "algae" clusters. Fuel tank may require
pumping out and a cleaning with a pressure washer or a
biocide being added to "kill" existing organisms which may
be caused by water in the fuel system and fuel tank. Replace
all fi lter elements and top the tank with fresh diesel fuel.
Prime and bleed the system. Run the engines and check
for fuel leaks and restrictions along with the possibility of
further contamination moving within the fuel system lines
and/or components. It may be necessary to replace diesel
fuel system fi lter elements several times to rid the system
of contaminants.
3. The fuel tank reads low and the engines are running
rough. The pick-up tubes in the diesel fuel tank have
sucked up air instead of fuel. The air has meandered
through the fuel lines, fi lters and is effecting the engine
performance. Top off the fuel tank as soon as possible.
Also, the fuel system must be bled and primed.
Another possible result of running with a near empty fuel
tank is the same pick-up tubes sucking water into the fuel
system. Remember water is heavier than diesel fuel and
will hug the tank bottom or baffl e areas. Take a sampling
of diesel fuel to identify any water in the fuel system.
4. Recommissioning after 6 months of winter storage
with a full diesel fuel tank the engines are hard to start
and exhibit a diesel clatter noise.
The diesel fuel in the tank may have deteriorated due to its
age. The cetane value may have decreased causing more of
an explosion inside the cylinder verses a controlled burn.
To start with add a cetane booster and conditioner. If this
fails take a sampling of diesel system fuel at the fi lters.
As a last resort pump out the fuel tank and replace with
fresh, clean diesel fuel.
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Systems