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Problem with diesel cutting out when driving

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Problem with diesel cutting out when driving

Old 03-05-2019, 06:13 AM
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Default Problem with diesel cutting out when driving

I have a Jag X type 2006 drove to Blackpool and when at 70 the engine died I slowed and restarted it. It worked then Ok if I only did 60. In Blackpool called the AA who put his machine on it and said it was low fuel pressure on the injector bar.
He said replace the fuel filter I did. Coming back to London it did the same again and half way back I found I could only do 40 otherwise it cut out again. I find now it will only do 30

Thinking there was a fuel pump in the tank I cut the metal in the back seat and removed the pump from the tank. Dismantling it found there was no pump at all in there so I guess the pump is part of the injector pump and sucks it all from the
tank itself.

Anything, I should look at to find where the problem lies or tests I can make. If it is the pump can I get an exchange one or have mine repaired.
Old 03-05-2019, 09:17 AM
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Welcome to the forum bscho,

As a newbie, you can't download files from the forum so I'll attach the relevant information about diesel engine fuelling here.

Fuel Injection Supply Manifold
The fuel injection supply manifold is a reservoir for the pressurised fuel that is produced by the fuel pump. It also incorporates a pressure sensor so that the ECM can monitor/adjust the pressure of the fuel to be injected into the cylinder. The fuel injection supply manifold and the pressure sensor are serviced as an assembly and must not under any circumstance be disassembled.

Fuel Pump
The fuel pump is located under the intake manifold and is driven by the timing chain at the front of the engine. The fuel pump contains two different types of pump, a transfer pump and a high pressure pump.The transfer pump draws the fuel from the fuel tank and through the fuel filter, it then pumps the fuel to the high pressure pump. The transfer pump maintains a constant pressure of 6 bar (87.02 lb/in) via a regulating valve within the fuel pump, this is known as transfer pressure.The high pressure pump receives fuel at transfer pressure from the transfer pump and increases the fuel pressure to between 200 and 1600 bar. The high pressure fuel is then transferred from the high pressure pump to the fuel injection supply manifold.

Fuel Return Line Venturi
The fuel return system incorporates a fuel return line venturi, installed to the back of the fuel pump. The fuel return line venturi is a partial restriction in the fuel return line, which creates a negative pressure in the fuel return system prior to its position in the system. The negative pressure created by the fuel return line venturi helps in the removal and the return to the fuel tank of the fuel leaked off by the fuel injectors.

Fuel Filter
The fuel filter is located at the top of the bulkhead on the right-hand side of the vehicle. The fuel filter incorporates a fuel pre heat function, which utilises a ball valve operated by a bimetallic strip. When the temperature is less than 15 C (59 F), the ball valve allows the warm fuel in the fuel return system to pass back through the fuel filter to the fuel pump to improve cold running. Once the temperature exceeds 31 C (88 F) a bimetallic strip closes the ball valve in the fuel filter and all of the fuel in the fuel return system is directed back to the fuel tank.

I hope this helps identifies the components, their locations and possible causes of the problem.

When you get a minute, please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Old 05-18-2019, 11:01 PM
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I am having issues with my Jag 2.2 Diesel and replaced the fuel sensor in the fuel injection supply manifold myself. Reading what you have said in this thread does that mean the unit is kaput?

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