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Posted

Hi

Purchased a replacement fuel filter a few weeks ago but not sure if any special procedure needed to change.

ie Do I need to depressurize the fuel system and does it need repriming 

Thanks

Posted

There's no need to de-pressurize but sometimes there's difficulty getting it primed.   Some versions have a lift pump in the tank which strikes up for a few minutes before each switch on.   Others are without the lift pump but have a hand primer close to the filter bowl.   Also there's a variety of different filters fitted.   It's most important that the replacement filter matches the one being removed.    Below are a couple of piccys of two different filters used on C5s.   The first one's lid is held by a screwed ring.   Detach the two pipe junctions and the electrical connector.   Use a strap wrench to remove the screwed ring and lift off the top.   On the second piccy the lid is removed by using a socket on the plastic 'nut'.   Use a well-fitting socket - the corners are easily damaged.   Unscrew until the lid lifts away.   In both cases, use a new rubber ring when refitting.   Before starting work it's advisable to pack rags under the filter bowl.   Also a small bowl is useful to put the dripping filter into.

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Posted

dont use a strap wrench if it slips it breaks top of filter housing proper tool is only a few pounds 

make sure filter housing is full of diesel when new filter is fitted and it will not need bleeding or priming

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