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Discussion Starter #1 (Edited)
Hi All.

we have an issue with high pressure fuel system and we need help from experts.

2010 RR SC

1. both HPFP were replaced
2. high pressure sensor was replaced.
3. fuel filter was replaced

with first start, high pressure ~564kPa. almost the same as low pressure.
After some time, it will jump to 17-18kPa and stay at the same level.
After turn off the car, high pressure will raised to 20kPa

Any ideas>

Thank you in advance.
 

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2010-2012 Range Rover MkIII / L322
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The HP fuel pumps are electro-mechanical in that the fuel pressure is generated mechanically by the actuation of a plunger driven by a cam on an auxiliary camshaft driven via chain from the front of the crankshaft - one cam lobe per pump.

They're electrically "managed" through the ECM.

Are you absolutely certain that both of the cam follower buckets were re-installed when the pumps were replaced?

As the hard lines are unique to each pump (inlet) and their output lines are pre-shaped it's impossible to fit those incorrectly (although it is possible for them to be subject to a blockage due to foreign object/material).

Are both electrical connectors re-attached?

What's the low fuel delivery pressure to the inlets on the HP pumps?

It should be around 30-34psi from the electric pump in the gas tank.

You can measure that LP from either disconnecting the LP return push in connector above the left bank or at the LP sensor manifold under the rear of the left front wheel arch liner.

Rob
 

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Discussion Starter #5
Hi Rob. thank you for respond.

LP around 85 PSI / 580 kPa - it is normal pressure

we did timing chain on this car and install new pumps.But now we stuck with High pressure too high
 

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Discussion Starter #6
High pressure pump, are not producing high pressure on first time

High pressure = low pressure
after couple of time of acceleration, high pressure jumps to 17,400 kPa
 
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