I have a 3 ltr x250 on a recent trip back to Spain where the outside temp was 35 plus after turning engine off. I f i then turn ign back on the tank fuel pump make a very loud noise this continues until the out side temp drops.The motor is not over heating should I worry?

There are 2 fuel pumps.
1) A low pressure electric one on the top of the tank which you access from the smaller of the 2 'manhole covers' in the cab floor.
2) A high pressure mechanical one on the engine.
Once the engine has been primed with fuel by the electric pump, it is no longer necessary in normal temperatures because the engine pump will suck the fuel right through from the tank - (so the old anti-theft idea of fitting a secret switch for the electric pump won't work) Its only when you have run out of fuel, change the filter etc so the system needs priming, or it gets very cold so the diesel is too thick for the engine pump on its own, that you need the electric pump. So it may already have stopped working. Even if you are not going to run out of fuel, or change the filter, I think you need to get it fixed before the winter.

hogan7777 said:

I have a 3 ltr x250 on a recent trip back to Spain where the outside temp was 35 plus after turning engine off. I f i then turn ign back on the tank fuel pump make a very loud noise this continues until the out side temp drops.The motor is not over heating should I worry?

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hi . we had the same prob in france also on a hot day from under the passenger floor lasted about 3 months so had the fuel filter changed in england & it disappeared .

Thanks guys
Its definitely the one in the tank.I will try changing the filter first.If problem persists I will look at pump.But will wait until am back in UK.

Not sure that I would agree with the fact the low pressure pump is only needed to prime the system when changing filter etc, on my motorhome if you remove the power supply to the low pressure pump while the vehicle is running it stops the engine, if no power to the low pressure pump when starting the vehicle it will just contine to turn over and not start. As far as I understand the system the ecu sends a signal to the low pressure pump every time you turn the ignition on this runs the pump for 10 seconds to prime the high pressure pump from then when the engine runs the cam sensor and high pressure pump comunicate with the ecu and the low pressure pump.
Be interested to know if any of you dissconect your power to the low pressure pump if your vehicle continues to run mine will deffinatley not.
Regards to all

Lexion770 said:

Not sure that I would agree with the fact the low pressure pump is only needed to prime the system when changing filter etc, on my motorhome if you remove the power supply to the low pressure pump while the vehicle is running it stops the engine, if no power to the low pressure pump when starting the vehicle it will just contine to turn over and not start. As far as I understand the system the ecu sends a signal to the low pressure pump every time you turn the ignition on this runs the pump for 10 seconds to prime the high pressure pump from then when the engine runs the cam sensor and high pressure pump comunicate with the ecu and the low pressure pump.
Be interested to know if any of you dissconect your power to the low pressure pump if your vehicle continues to run mine will deffinatley not.
Regards to all

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Well mine is a 2008 manufactured Citroen Relay with the 2.2 120hp engine. I pulled the electrical connector right off the electric fuel pump and drove it several miles before replacing the plug. (The reason I did this was I was looking for a wire to interrupt with my secret switch as an anti theft measure. On other vehicles disconnecting the fuel pump may be ideal for this because the vehicle would start and run a very short distance on the fuel in the pipes, before running out leaving the thieves suddenly broken down in an awkward place)

Peter James said:

Well mine is a 2008 manufactured Citroen Relay with the 2.2 120hp engine. I pulled the electrical connector right off the electric fuel pump and drove it several miles before replacing the plug. (The reason I did this was I was looking for a wire to interrupt with my secret switch as an anti theft measure. On other vehicles disconnecting the fuel pump may be ideal for this because the vehicle would start and run a very short distance on the fuel in the pipes, before running out leaving the thieves suddenly broken down in an awkward place)

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Ok interesting. My motor is the fait 2.3 130bhp with a nippon denso high pressure pump perhaps this one cannot siphon the fuel when running??

Peter James said:

Well mine is a 2008 manufactured Citroen Relay with the 2.2 120hp engine. I pulled the electrical connector right off the electric fuel pump and drove it several miles before replacing the plug. (The reason I did this was I was looking for a wire to interrupt with my secret switch as an anti theft measure. On other vehicles disconnecting the fuel pump may be ideal for this because the vehicle would start and run a very short distance on the fuel in the pipes, before running out leaving the thieves suddenly broken down in an awkward place)

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I know this was posted a long time ago but can anyone suggest an electrical supply to interrupt that would cause the fuel to stop flowing?
2.2 100 multijet
thx.

Inertia switch

thx m8 for such a speedy reply.
will check it out.