Land Rover Fuel Injection System Manual

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Throttle linkage
The arrangement of placing the plenum chamber with its air intake toward\
s the drivers side meant 
that it was possible to reuse the existing throttle cable. 
Figure 23 – Throttle fabrication
 
However, the existing throttle assembly steel frame fouled the intake me\
tal air pipe running from 
the plenum to the mass air flow sensor assembly and so had to be discard\
ed. The throttle 
assembly was cut back, and welded strengtheners were added to the existi\
ng frame. A...

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The arrangement permits ingress of the fine throttle cable through the s\
lot, at which point the 
whole throttle cable assembly can be moved forward to permit the mount s\
crew thread to enter 
the main hole shown above. Once in position, the slot does not permit th\
e throttle mount screw to 
exit. 
 
The throttle linkages on the plenum are sprung at wide open throttle whe\
n the back stop is 
reached. In other words when the throttle blade is wide open, the thrott\
le actuator can be...

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diameter, and 80mm outside diameter. The sleeve was designed to be an in\
terference fit on the 
72mm collar of the plenum chamber. Silicon sealant was then applied to t\
he inside of the sleeve 
and it was then driven carefully onto the plenum – and left to set fo\
r 24 hours.
 
Two brushed aluminium pipes with 80mm outside diameters were then purcha\
sed, one a right 
angle, and one a 45 degree. Both had been bent using a mandrill press re\
sulting in a smooth inner 
radius. These two...

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slotted – permitting the entire MAFS assembly to move. In addition, t\
he left hand curved mount 
bolt hole (see above – closest bolt to alternator) is also slotted,\
 whereas the right hand lower bolt 
hole is fixed. That means that the entire assembly can rotate around the\
 right hand lower bolt. The 
combination of the two adjustments allows the MAFS position to meet the \
intake pipe, while coping 
with minor adjustment changes to the alternator position. 
 
During the fabrication...

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care is required to meter the precise amount of air it passes, while ens\
uring that it functions as a 
self contained system of crankcase ventilation. 
 
The standard PCV system designed by Rover for a fuel injected engine req\
uires the use of different 
rocker covers (a new set had to be sourced from eBay). The key feature\
s of the new rocker covers 
are a built in PCV breather metered orifice (see (c) below), a screw\
 thread capable of 
accommodating the oil separator (see (D) below),...

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Figure 30 – Rover PCV coupling T piece
 
The plastic T piece has a third metered orifice (a 3mm hole) which is \
connected to an engine 
vacuum port on the plenum, via hose pipe. This path is designed to provi\
de a metered amount of 
vacuum to the PCV system when the engine is idling, with the throttle sh\
ut. It is worth noting that 
the amount of air flow is substantial, even with this metering orifice –\
 a fact which has a bearing 
on the engine idle speed as the PCV system behaves as...

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Figure 32 – Fuel system schematic
 
14CUX production implementations generally employed wet fuel pumps mount\
ed inside the fuel 
tank along with non-serviceable gauze intake filters. The pump pressuris\
es fuel to about 3 bar and 
delivers it to an inline replaceable filter and onto the fuel rail – \
connecting to all 8 injectors. At the 
distant end of the fuel rail, the pipe connects to the inlet of a fuel p\
ressure regulator designed to 
regulate the pressure between 24 and 36 psi,...

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Figure 33 – Fuel pump and plumbing schematic
 
The fuel circuit was plumbed using predominantly 8mm fuel hose (rated t\
o DIN standards for fuel 
injection). A small amount of 12mm hose was used to couple the inlet of\
 the fuel pump.
 
Where the fuel line runs up the firewall to the rear of the engine, it c\
onnects to an aluminium block 
threaded with three holes – two designed to accept 8mm hose ends, and\
 a third tapped to suit a 
1/8
th NPT non-permanent fuel gauge. After testing...

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The fuel tank
During the early part of August 2010, the relatively new fuel pump faile\
d as a result of an electrical 
fault (not linked to any plumbing problem). The pump was replaced (an\
d a second spare pump 
purchased at the same time).
 
Later that month, a series of odd running problems hit at more or less t\
he same time – but which 
were clearly linked to the recent rework of the induction intake routing\
. There had been a 
noticeable smell of fuel in the cab – which couldn’t be...

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Vacuum plumbing design
Connections to the engine intake are used by a number of key engine comp\
onents. There are five 
vacuum ports on the engine…
 1.  Primary vacuum feed for the brake servo
2.  Advance / retard vacuum feed for the distributor
3.  Vacuum feed for the fuel pressure regulator
4.  Vacuum feed for the PCV (crankcase ventilation system) from two so\
urces.
5.  Vacuum feed for a dash board gauge. 
 
The brake servo connects directly to a driver side port screwed into the\...