We have a 2018 chic c line that seems to have a diesel leak it is dripping off the bottom of a metal shroud on the underside of the vehicle directly below the filler neck. I saw a wet patch on the drive when moving the MH and had a look and I can see a small drip on this metal shroud but it only seems to do it when I have brimmed the tank full of diesel and my drive is on a slight backward slope has anyone else had any issues could it be coming from some sort of breather as it is 100% full but even so I have never had a vehicle that leaks when completely full of fuel
2018 carthago diesel leak
- Thread starter Lanerboy
- Start date
Stagecoach
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- Sep 11, 2018
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Not paying particular attention to make and model, however most systems have a breather tube built into the filler neck for that exact reason. This allows for expansion of the fuel and tank in hot weather or in case it is overfilled. However, I suspect some one with the same model as your will be able to clarify the problem for you. If after a days driving, does the “leak” stop? If so then it it probably just overspill.
Regards, Mike.
Regards, Mike.
- Oct 30, 2010
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Has it had a service and fuel filter change recently?
Fuel filters are very prone to splitting if they haven't been refitted correctly.
There have been lots of threads on here about it.
Hope you get it sorted quickly.
Richard.
Fuel filters are very prone to splitting if they haven't been refitted correctly.
There have been lots of threads on here about it.
Hope you get it sorted quickly.
Richard.
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Lanerboy
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Hi Mike
I have only ever noticed it when its on my drive and 100% full so I think the answer is yes it stops once the tank goes down a bit
Richard it is only 8 weeks old so no service as of yet and it is leaking directly under the filler neck no where near the fuel filter but something to remember for a later date
bobandjanie
LIFE MEMBER
When filling I always stop as soon as the pump cuts out, I've had the chaps in Spain fill you up, and try and brim it 
and probably sell you a little extra. 
But I stop them. Bob.
and probably sell you a little extra. But I stop them.
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- Oct 30, 2010
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Hmm! Strange.
In summer with hot weather I would suspect the fuel expanding and dripping down a breather pipe but it's not exactly tropical in the UK at the moment.
Although our van is now 4 years old it's probably quite similar in build to yours and we've never had a problem like that, even in the Med where its been pretty warm.
Richard.
Lenny HB
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O
They haven't used those filters for a few years now, new ones are OK
Stagecoach
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- Sep 11, 2018
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Hi Richard, but he said that he has brimmed it so would have the same effect regardless of weather. It will come out of the overflow.
- Oct 30, 2010
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Yes, you are probably right.
I always stop when the pump cuts out and don't try and get the last little drop in.
Can't quite see the point in that.
Richard.
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Lanerboy
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when I say brimmed it I mean filled up till the pump cuts out I dont try and get another 50p worth in, could it be because its full then parked on my drive which slopes backwards a little so front end is slightly high
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Lanerboy
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I'm not sure its very hard to see anything as this metal cover is hiding everything and I dont want to start messing now as I am off the south of France in it on Tuesday I will just have to not fill it right up next time
Surely a fuel leak will be peculiar to the Fiat base, rather than the body placed on it?
- Oct 29, 2016
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Check the filler cap is secure and seated properly after removing the locking key
I have to check now whether the filler cap is well secured after filling up with diesel, as whilst touring I noticed diesel had run down from the filler cap rubber seal aperture, out the flap and down the side of the van.
I now do as others and DONT fill it to the brim, just fill to first click of pump, then make sure the filler cap is seated properly after removing the key.
Lesson To learn for myself.
Dont know about you guys but I always mistakenly trust that the pump fuel nozzle is fairly clean and end up not only getting diesel on my hands but also the key used to open the damn thing.
I now have a handful of polythene gloves, but bet I will forget next time I fill up, unless OH reminds me.
One pump in the highlands near Bettyhill (unmanned) was so wet with diesel on nozzle and right down the the rubber pipe, that having used it I had to go and wash hands with neat washing up liquid before setting off again, I could smell it on me all afternoon.
@Lanerboy Hope that its something simple,like the cap not seating properly and wont need a dealer fix
Les
I have to check now whether the filler cap is well secured after filling up with diesel, as whilst touring I noticed diesel had run down from the filler cap rubber seal aperture, out the flap and down the side of the van.
I now do as others and DONT fill it to the brim, just fill to first click of pump, then make sure the filler cap is seated properly after removing the key.
Lesson To learn for myself.
Dont know about you guys but I always mistakenly trust that the pump fuel nozzle is fairly clean and end up not only getting diesel on my hands but also the key used to open the damn thing.
I now have a handful of polythene gloves, but bet I will forget next time I fill up, unless OH reminds me.
One pump in the highlands near Bettyhill (unmanned) was so wet with diesel on nozzle and right down the the rubber pipe, that having used it I had to go and wash hands with neat washing up liquid before setting off again, I could smell it on me all afternoon.
@Lanerboy Hope that its something simple,like the cap not seating properly and wont need a dealer fix
Les
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Yes I've had that & had to remove & clean the rubber seal + tweak the metal the cap locks on to.
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Daft question, are you sure it is diesel dripping down? I have a Carthago with the same type of filler set up and notice on occasion something dripping off the bottom skirt which at first I assumed was diesel but after smelling and tasting! I concluded that it was water. Having looked at the way water runs down the front and the side especially if the van is not level it does give the appearance of diesel dripping/leaking. I only notice diesel if it is very hot and I have filled it right up
Just a thought.
Just a thought.
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Lanerboy
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no defo diesel it has marked my block paving
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M_1
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Just wondering what the outcome of your Carthago diesel leak issue was ?
We have a 2018 Carthago Compactline with exactly the same issue. Ours has been to a Fiat Professional dealer who say, having removed the metal shroud which sits directly under the passenger side door that the problem is with a "concertina" connection between Carthago's filler pipe and the Fiat fuel tank.
They say this needs addressing by a Carthago dealer partner as it requires removal of the Fiat fuel tank and may need Carthago parts, so was this how your problem was resolved ?
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Lanerboy
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Too be honest mine seems to have stopped by itself well I have not noticed and spillage on the drive for a few months I will get underneath over the weekend and have a look now you have jogged my memory
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Lanerboy
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A few weeks ago I needed to remove the cabinet work around the fuel filler pipe on a 2010 LHD Carthago.
I noticed the rubber breather pipe had split at an acute bend in the flexible pipework. The breather tube from the tank is metal and then a flexible tube is inserted to the fuel filler. It was obvious that Carthago had made the rubber tube too short, putting extra strain on the bends.
All fixed now with a new hose and a more generous route between metal breather tube and filler. Hopefully now, I won't get a smell of diesel fumes when I fill the tank.
If Carthago have been using the same length of tube for all their A class models.....expect problems !!!
I noticed the rubber breather pipe had split at an acute bend in the flexible pipework. The breather tube from the tank is metal and then a flexible tube is inserted to the fuel filler. It was obvious that Carthago had made the rubber tube too short, putting extra strain on the bends.
All fixed now with a new hose and a more generous route between metal breather tube and filler. Hopefully now, I won't get a smell of diesel fumes when I fill the tank.
If Carthago have been using the same length of tube for all their A class models.....expect problems !!!
You have probably bought diesel with water in it and the cold weather has frozen the water causing the liquid mass to expand. It’s called global warming.? I go with the too full idea can you park the MH the other way round or slightly raise the filer side that will oliveate (sorry about spelling)
The overfill theory?
The overfill theory?
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Lanerboy
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Update on my diesel leak
Finally got it sorted today we drained the tank and dropped it down after finding it leaking on a join where carthago join their pipe on the A class onto the Fiat fuel tank.
There is a join with a clamp on it and mine had not had the carthago joining piece correctly inserted over the fuel tank filler neck and was leaking on this join.
Removed it completely then re fitted it correctly using the original clamp plus 2 further clamps for added security one either side of original clamp, all done and sorted so no more leaking all over my drive
Finally got it sorted today we drained the tank and dropped it down after finding it leaking on a join where carthago join their pipe on the A class onto the Fiat fuel tank.
There is a join with a clamp on it and mine had not had the carthago joining piece correctly inserted over the fuel tank filler neck and was leaking on this join.
Removed it completely then re fitted it correctly using the original clamp plus 2 further clamps for added security one either side of original clamp, all done and sorted so no more leaking all over my drive
Just to clarify.......you found the leak at the joint where the 60mm dia flexible pipe enters the Fiat fuel tank ?
It's fortunate you have the facilities to carry out this work at your fully equiped workshop. At least the fuel consumption should improve now
I was wrong again just like Hollyberry’s quizzes off to the corner
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Lanerboy
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