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Fuel filter replacement

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Old Jan 22nd, 2020, 19:41   #1
nrobinson
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Default Fuel filter replacement

Just about to replace my fuel filter on 2003 XC90. The filter is is the paper cartridge type. I'm hoping it shouldnt cause any dramas but have been caught out before with the jobs that are supposed to be easy !

Referring to the Haynes manual as i couldn't find anything on Vida, the write up starts by saying do not change if the tank is over 3/4's full - typically !! mine is full to the brim at the mo, and not likely to be used much until the filter is done. I could really do without messing around draining fuel off.

Can anyone tell me the reason it shouldn't be done with more than 3/4 tank. Is it because it will induce fuel siphoning or similar?

Also whilst on the subject how durable are the drain taps on the filter housing? I'm assuming they are plastic? The last one I did on an older landrover snapped off when trying to undo it and i wish i had left it alone and just removed the complete housing instead of draining.

Thanks
Nick
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Old Jan 22nd, 2020, 20:38   #2
john langrick
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Hi nick, on my XC90 the filter was like this.

https://rover.ebay.com/rover/0/0/0?m...2F283723091431

Mine is an '03' model.

May be worth looking as I got the wrong one first!

John l
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Old Jan 22nd, 2020, 20:52   #3
nrobinson
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Thanks John.

Its definitely the cartridge type as I've had a look.

I've also answered my own question about the drain key. No worries with this - nice and loose. In fact i wise surprised how easily it moved!

Just need an understand why it shouldn't be removed with more than 3/4 tank of fuel.

Rgds
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Old Jan 22nd, 2020, 22:28   #4
Kev0607
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You're not going to lose 'that' much fuel anyway, so it makes no difference what level the fuel gauge is at. The only thing I can think of is maybe Haynes think a full tank will have more pressure, which would make the filter housing harder to get off. However, there won't be pressure because the engine won't be running when you're doing this job & therefore no relays/pumps are working.

I know when I changed my fuel filter that I didn't look to see what the fuel gauge was showing & it didn't make a bit of difference to the job in hand. Get it changed
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Old Jan 23rd, 2020, 00:39   #5
nrobinson
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Thanks Kev

Yes I will crack on and do it tomorrow evening. I've already loosened so I know its not going to be a battle to get off.

My logic is that removing the drain plug will release any pressure anyway, and I can allow the filter to drain which will allow be to control / determine any loss of fuel.

Rgds
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Old Jan 23rd, 2020, 00:57   #6
cheshired5
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Quote:
Originally Posted by nrobinson View Post
Can anyone tell me the reason it shouldn't be done with more than 3/4 tank. Is it because it will induce fuel siphoning or similar?
Basically, yes.
The fuel system is primed with no air in the lines and the filter inlet is lower than the top of the tank so unscrewing the filter will start a flow which may not stop quickly if the fuel in the tank is high.

That said, Vida is written assuming the car is sitting level on a lift whereas we will tend to have the car jacked up and tilted which moves the fuel across the tank and raises the filter inlet to a position that's higher than the fuel level.

Regardless, I always have a a decent sized clean bowl to catch any fuel just in case.
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Old Jan 23rd, 2020, 22:49   #7
Kev0607
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Originally Posted by nrobinson View Post
Thanks Kev

Yes I will crack on and do it tomorrow evening. I've already loosened so I know its not going to be a battle to get off.

My logic is that removing the drain plug will release any pressure anyway, and I can allow the filter to drain which will allow be to control / determine any loss of fuel.

Rgds
Nick
Good luck. Let us know how you get on.
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Old Jan 24th, 2020, 09:54   #8
Borgi
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Not wanting to put you off replacing your fuel filter but I feel I should tell you about my experience when I replaced my filter.

I successfully changed my fuel filter six years ago without any issues however, four years later, my car would take much longer on the key for it to start. I did some research, replaced the pressure sensor on the injector rail, had the AA out to it but nothing would explain the reason.

On a trip to the south west of England, the red engine warning light lit up whilst on the motorway. After pulling in & restarting the car the light would go out. This happened four or five times on the way.

Whilst on this trip, I passed an independent Volvo specialists who informed me that there could be a crack on the filter housing allowing the fuel pressure to escape when the car is not in use & the reason for the long cranking duration of the engine is due to the fuel pumps having to re-pressurize the system.

Replacing the filter housing proved to be a very expensive job due to the need to have a software download. On certain models, once the electrical connection has been removed, the ECM needs to be told that all is well. VIDA will not do this. A visit to a Volvo dealer has to be made.

Total cost including the saving I made by sourcing my own assembly from FRF Volvo came to £485.00.

A simple job of replacing a fuel filter should not require any re-programming but on certain chassis numbers, they do.

Good luck.
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