TPD1317e Chapter 6
Page 33
Fuel Systems
Design and assembly faults in the fuel system are responsible for many problems with marine diesel
engines. A good system is not hard to achieve, being largely a matter of avoiding obvious pitfalls.
6.1 Fuel Connections
A common reason for service problems with fuel systems is the use of poor or incompatible connectors, where
the pressure tightness depends upon the use of sealing compounds, hose clamps, bre washers trapped
between inadequate and unmachined faces, or compression ttings which have been over-tightened to the
point where they no longer seal.
Cleanliness during initial assembly is also of vital importance, particularly when fuel tanks are installed, as
glass bres and other rubbish may enter tanks through uncovered apertures.
Thread details of the connections on the engines for fuel pipes
Model
M300Ti / M265Ti
M225Ti / M215C / M185C / M135
/ M130C / M115T / M92B / M92
Fuel feed 3/8” BSP 1/2” UNS
Fuel return 3/8” BSP 7/16” UNS
It is strongly recommended that the exible fuel pipes available as an option with the engine are used, which
are as follows:
Fuel Feed - M300Ti & M265Ti (Pt No 34051)
The free end of the exible pipe has a 3/8” BSP cone ended tting, and is supplied with an adaptor, nut, and
olive to suit 10mm OD steel or copper tube.
- M225Ti / M215C / M185C / M135 / M130 / M115T / M92B & M92 (Pt No 34055)
The free end of the exible pipe has a 1/2” UNS male thread, and is supplied with a nut and olive to suit 5/16”
OD steel or copper tube.
Fuel Return - M300Ti & M265Ti (Pt No 34052)
The free end of the exible pipe has a 3/8” BSP cone ended tting, and is supplied with an adaptor, nut, and
olive to suit 10mm OD steel or copper tube.
- M225Ti / M215C / M185C / M135 / M130 / M115T / M92B & M92 (Pt No 34054)
The free end of the exible pipe has a 7/16” UNS male thread, and is supplied with a nut and olive to suit 1/4”
OD steel or copper tube.
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