Installation Manual

N38143 Chapter 3
Page 11
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.
It is strongly recommended that the exible fuel pipes available as an option with the engine are used, which
are as follows:
Fuel connections - 415GM, 422GM, 422TGM & 700GM
Standard Fuel Feed
The free end of the exible fuel pipe has either:
1/4” BSP male thread.
Standard Fuel Return
The free end of the exible pipe has either:
a 1/4” BSP male thread.
Optional Fuel Feed
The free end of the exible fuel pipe has either:
1/4” BSP male thread.
Optional Fuel Return
The free end of the exible pipe has either:
a 1/4” BSP male thread.
Caution: Ensure that exible fuel hose routing avoids coming into contact with parts of the engine which can
lead to abrasion of the hose.
Fuel connections - 4GM, 4TGM 4.4GM, 4.4TGM, 4.4TWGM, 4.4TW2GM, 6TG2AM &
6TWGM
Standard Fuel Feed
5/16” OD, nut and olive to suit 5/16” OD steel or copper tube.
Standard Fuel Return
a 1/4” OD, nut and olive to suit 1/4” OD steel or copper tube.
Optional Fuel Feed
5/16” BSP male thread, nut and olive to suit 5/16” OD steel or copper tube.
Optional Fuel Return
a 1/4” BSP male thread, nut and olive to suit 1/4” OD steel or copper tube.
Caution: Ensure that exible fuel hose routing avoids coming into contact with parts of the engine which can
lead to abrasion of the hose.
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Fuel systems