Installation Manual

Chapter 3 N38143
Page 14
In some cases it is necessary to have a number of fuel tanks in order to achieve the required operating range.
In such cases, where possible, one tank should be regarded as the main tank for each engine and the other
tanks should be arranged so that they will drain into the main tank by gravity. If a gravity system is not possible,
then the system shown in gure (C) should be used.
Figure (C) shows a collector tank (C1),fed by all the storage tanks (C2) and connected to the engine feed and
return systems, but with a vent pipe (C3) taken to any convenient tank and connected to it at the highest point.
The fuel feeds (C5) should be taken from the bottom of the collector tank and the fuel returns (C6) at the top.
A water separator (C4) should be installed which should suit the total ow for all the installed engines.
There is no doubt however, that a simple fuel system as illustrated in Figure (A) or (B) should be used wherever
possible, as having a completely separate tank and supply to each engine guarantees that if an engine
stops, due to running out of fuel or to water or foreign matter in the fuel, the other engine will not be affected
simultaneously. This will give some time for appropriate manoeuvring action to be taken. The simple system
will also require the minimum number of valves and ttings, which ensures maximum reliability in service.