I tested the system once again. It's freezing cold and the pressure gauge, when connected, is constant. The valves were at fault. When removed, on inspection, the HP one was seized while the LP rubber had perished. Cheaper to DIY.

I bought two from a spare parts dealership for £20. Theyre gold plated, it seems. Injected yellow dye and fitted them, followed by a recharge. All seems good to go so far.

I replaced the camshaft sensor today, with a new one, when the engine was hot and there was no difference. I froze the original and refitted it, with the same result. I did an Injector fuel return check as well, and 1, 3 & 4 Injectors produced 35mm after 5 minutes. No2 = 40mm. I ran two tests...

Both my air-con valve (Low & High) inserts are faulty. They measure 22mm x 8mm Might anyone know where they can be bought?

There is one other question. Might anyone know the wiring codes for the High Pressure Fuel Line Pressure sensor. Their are three wires, yellow brown and red, I think. Can anyone tell which wire goes to which numbered contact on the sensors plug. Ta.

I'm going to do it. The frozen chickens a great idea as well. Might try em both.

Thanks. Im printing what you sent as I write.

My problem is poor starting when the engine warms up. The hotter it gets the worse the problem. It turns over all right, but chugs away until it catches. The battery is good. It’s a 2004 Freelander 1 TD4. I have done with new parts, Low pressure pump and filter replaced. Replaced all seals...