Technical Fuel flexi hose on 1993 Fiat Uno

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Technical Fuel flexi hose on 1993 Fiat Uno

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Sep 2, 2007
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Hi all,

Following an MOT, my 1993 Fiat Uno has failed due to a flexi hose which is leaking fuel near to where it is attached to the metal tank. This hose runs from the petrol filler cap (or nearby) to the tank and looking back at an earlier thread, I thought it might be a vent/breather hose but it seems not to be the case, as Morty Mort said:

"The tank has one large fuel hose. Beside this hose there is a smaller one, maybe 1" thick. It goes up to the petrol cap area. The petrol cap should make a suction noise when opening. Two hoses are attached to the pump. So - actually there are no breather hose. I did some studying when I changed it myself, because I couldn't find the vent hose. The ventilation is contained within the system. Vapour is driven through a carbon filter and returned to the engine intake".

I have attached a diagram of the fuel system which I got from my local Fiat dealer and a simpler layout in the relevant part of the Haynes manual (acknowledged). The smaller concertina hose I need is shown as number 25 (part number: 7749842) rather than no 16 on the dealer printout but am a bit confused as there only seems to be one fixing point on the tank for two different hoses. Also, does anyone know the function of this smaller hose rather than the main larger one, perhaps an overflow hose? Clicking on the attachments will increase them to a more user friendly size!

001.JPG

002.JPG

Any advice or help would be appreciated.

Thanks,

Andy :)
 
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Hi Nigel,

Thanks for the info. Is the hose you mentioned shown as no. 25 in the diagram? If so, do you know the function and method of fixing hose no.16 in the same picture, in case this is needed too?

Cheers,

Andy
 
Looking at the parts listing, the pic you've posted from the dealer comes up on mine as USA vehicles.
The pic looks like there might be only one hose, and after looking you choose the one you have.
Before you go any further, you need to have another look under the car and determine if you have one or two hoses and which one(s) are leaking.
If you PM me with your full VIN number, the parts listing will exclude any parts not relevant.

http://eper.fiatforum.com/eper/navi...=3&WINDOW_ID=1&SGRP_COD=0&SGS_COD=0&DRW_NUM=1
 
Last edited:
Thanks for the extra info, Nigel. There is only one secondary hose on mine and this is leaking near the tank end. It is a plastic flexi/concertina hose (no.25 on the dealer pic) which feeds into the main hose at the top end before the main hose reaches the filler cap. Your diagram via Fiat makes it clear there is only one secondary hose rather than two.

Cheers,
Andy
 
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