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Offline muddyweb

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Fuel pressure
« on: September 13, 2005, 00:06:27 »
Just before I go digging about in the manuals, does anyone know what pressure the fuel rail should be at on a 3.9 / 4.0 / 4.6 V8 engine ?
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Tim Burt
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Offline muddyweb

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Fuel pressure
« Reply #1 on: September 14, 2005, 10:54:55 »
In case anyone needs to know....

The 4.0 and 4.6 engines are both 2.4-2.6 bar regulated with the vacuum connected.

The 3.9 is 3.5 bar unregulated, as are most of the Lucas systems.



Off to stick a guage on it now  :-s
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Tim Burt
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Offline Range Rover Blues

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Fuel pressure
« Reply #2 on: September 16, 2005, 00:28:22 »
What's the difference between regulated and unregulated then Tim?
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Offline muddyweb

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Fuel pressure
« Reply #3 on: September 16, 2005, 00:33:59 »
From what I can tell... the regulated figure is with the vacuum hose connected... unregulated is without.
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Offline Range Rover Blues

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Fuel pressure
« Reply #4 on: September 16, 2005, 00:58:32 »
So in fact a more accurate measurment then? unless you also measure manifold depression (vacuum).
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Blue,  1988  Range Rover 3.5 EFi with plenty of toys bolted on
Chuggaboom, 1995 Range Rover Classic
1995 Range Rover Classic Vogue LSE with 5 big sticks of Blackpool rock under the bonnet.
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