Petrol tank leak CX
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Thread: Petrol tank leak CX

  1. #1
    Fellow Frogger! IE23's Avatar
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    Default Petrol tank leak CX

    When I fill the tank full (as I like to do to minimise petrol station stops) on the CX and return home I have noticed fuel smell. I thought the problem was a damaged filler pipe which I have replace with new. However after filling it up yesterday I noticed the smell again last night. Today I could see fuel dripping onto the ground after moving it. I can't see where the leak is but given it only happens when the tank is full it must be somewhere at the top. Apart from losing fuel and poor fuel economy the real worry is the drip can get awfully close to the exhaust.

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    Any ideas where the leak might be? I'm guessing I have to pull the tank out to properly investigate.
    Last edited by IE23; 20th July 2014 at 04:17 PM.


    Adrian

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    Pull the boot carpet up and you should find one or two round access covers towards the front of the boot floor. If you remove them, you should be able to see if there is a leak from the sender or pickup seal there. There is some variation between models as I recall, but I'd start looking there in any event.

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    Contented Peugeot Driver addo's Avatar
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    Does it have an external pump like the BX?

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    Fellow Frogger! kimmo's Avatar
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    I though they all do that when the tank is full

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    Real cars have hydraulics DoubleChevron's Avatar
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    Quote Originally Posted by IE23 View Post
    When I fill the tank full (as I like to do to minimise petrol station stops) on the CX and return home I have noticed fuel smell. I thought the problem was a damaged filler pipe which I have replace with new. However after filling it up yesterday I noticed the smell again last night. Today I could see fuel dripping onto the ground after moving it. I can't see where the leak is but given it only happens when the tank is full it must be somewhere at the top. Apart from losing fuel and poor fuel economy the real worry is the drip can get awfully close to the exhaust.

    Any ideas where the leak might be? I'm guessing I have to pull the tank out to properly investigate.
    It's the metal insert in the tank filler. If you wiggle it out you'll find an oring on the sleeve. Cos it's loose it leaks. You need to glue/seal the insert in so it'll stop leaking!


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    Thanks David, didn't know about that inspection point. That possibly answers my query how the filter is reached and cleaned.

    Addo, yes external fuel pump.

    Shane, I'll inspect this area again but I don't think this is the area where the leak is coming from, because I think I would have seen it already.


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    Contented Peugeot Driver addo's Avatar
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    The 405 leaked from the flex hose between fuel pump and hard line to engine bay; this went back over the tank.

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    I recently replaced filler pipe on the 2400 as it was cracked just at the top where the breather pipe attaches. It's easy to jam the filler nozzle into the brittle neck as it is such a large opening. (A new lockable fuel cap came with a smaller opening to accommodate the cap & by default protects the neck by not allowing the nozzle in as far) Make sure the smaller breather pipe is attached securely too. The old cap also didn't seal properly so could let fuel slosh out around corners if over filled. I had to replace the fuel level sender unit which involved removing the tank (early CX has no access from above) The flexible rubber neck from tank to plastic neck had become brittle & sprung a pin prick leak when manoeuvring it all back together! Luckily I had a spare. Awful job to do on own. Rear of car on Jack stands. Fuel tank on hydraulic jack. All pipes & leads only just reach when they're almost not accessible.
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    Real cars have hydraulics DoubleChevron's Avatar
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    they leak and stink lots if they have a near full tank 100% due to the metal insert allowing fuel and fumes past it. Fill the tank and drive around a few righ hand corners quickly, then check the filler area.... it'll be wet with fuel

    The smells that leaking metal ring brings forward if it's leaky (especially with the windows down) is remarkable.

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    Filler pipe is new, with small restricted metal neck.
    popped the caps in the boot and it's dry as there;Petrol tank leak CX-image.jpgPetrol tank leak CX-image.jpgPetrol tank leak CX-image.jpg What am I looking at here by the way, which is the filter?

    The all the filler pipes on the drivers side are also as dry as.

    Addo, I'll check the fuel pump area next. I'll have to back up onto ramps.


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  11. #11
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    The filter is not there, likely next to the pump.
    The 3 wires are for the sender 0 earth, signal and fuel light.
    The one with 2 pipes is pickup and EFI return.
    Carby will be different and it's all in the one unit. You can see your sender has the centre section blanked off.

    Check the tank breather hose back to the filler neck and look for a pipe running to a carbon canister to limit evaporative loss, if fitted.

    I assume you are aware the filler neck goes into a rubber U-bend that then comes back up to the top of the tank to fill it. It's part of the anti-syphon design. Unless you can snake a long tube down and into the tank via the weir at the top, you can only remove what's ion the neck and u-bend.

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    And I genuinely thought there was a design fault and they all stink from the new
    I've been driving roundabouts about 10kmh when leaving the petrol station for years... got tractors and ride-on mowers looking to overtake me.

    Quote Originally Posted by DoubleChevron View Post
    they leak and stink lots if they have a near full tank 100% due to the metal insert allowing fuel and fumes past it. Fill the tank and drive around a few righ hand corners quickly, then check the filler area.... it'll be wet with fuel

    The smells that leaking metal ring brings forward if it's leaky (especially with the windows down) is remarkable.

    seeya,
    Shane L.
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    Real cars have hydraulics DoubleChevron's Avatar
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    Quote Originally Posted by kimmo View Post
    And I genuinely thought there was a design fault and they all stink from the new
    I've been driving roundabouts about 10kmh when leaving the petrol station for years... got tractors and ride-on mowers looking to overtake me.
    The big cap has a nice nifty seal in it, the issue is it locks into that metal sleeve.... and the sleave itself allows fuel and fumes past it. If you wiggle the metal sleeve out and stick it back in with a sealer, it will stop smelling and leaking. The fuel cap does a good job at sealing when that metal sleeve is fully inserted and stuck down. You can actually feel the spring in the lid pull itself down against the seal when you screw it in against a glued/sealed down sleeve.

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    Quote Originally Posted by DoubleChevron View Post
    The big cap has a nice nifty seal in it, the issue is it locks into that metal sleeve.... and the sleave itself allows fuel and fumes past it. If you wiggle the metal sleeve out and stick it back in with a sealer, it will stop smelling and leaking. The fuel cap does a good job at sealing when that metal sleeve is fully inserted and stuck down. You can actually feel the spring in the lid pull itself down against the seal when you screw it in against a glued/sealed down sleeve.

    seeya,
    Shane L.
    Yup! I eventually traced mine to the connection between the lockable cap's base and the filler pipe at the bodywork. Then mine has a 20 mm (approx) rubber tube coming out the back top of the tank - to release air when filling to prevent blowback? - and it split a few years ago. I have never had a hint of a smell since fixing these two faults.
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    Quote Originally Posted by IE23 View Post
    Filler pipe is new, with small restricted metal neck.
    popped the caps in the boot and it's dry as there;Click image for larger version. 

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ID:	58579 What am I looking at here by the way, which is the filter?

    The all the filler pipes on the drivers side are also as dry as.

    Addo, I'll check the fuel pump area next. I'll have to back up onto ramps.
    Because it only occurs when the tank is full to the brim I haven't worried about it much lately. But now, when tank is full, I can see wetness from fuel around the one on the passenger side (pictured). I'm guessing a seal is broken. What's the fix on this?


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    I would be putting the car on ramps and removing the entire tank and filler assembly. Then I would check everything for good condition including clamps hoses seals and renew as necessary. This approach will ensure that the problem is fixed once and for all time!
    A time consuming job but not difficult!
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    1000+ Posts Greg C's Avatar
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    It is the fuel gauge sender that is probably the issue. I had to replace mine a few years back, Then I got was the only new one left in Australia. I hope more have turned up but you could try CX Basis. To really check for leaks, remove tank put some fuel in, turn tank upside down and leave overnight. this will unearth the leak. The Sender unit is plastic and on mine was cracked.
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    Quote Originally Posted by Greg C View Post
    It is the fuel gauge sender that is probably the issue. I had to replace mine a few years back, Then I got was the only new one left in Australia. I hope more have turned up but you could try CX Basis. To really check for leaks, remove tank put some fuel in, turn tank upside down and leave overnight. this will unearth the leak. The Sender unit is plastic and on mine was cracked.
    Yes, in the picture it looks like there may be a crack in the top, starting at the leftmost of the three terminals. There is simply a flat rubber washer seal under the sender.

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    I think you are right David. CX Basis has some replacements and seals so I'm onto that. I'm also going to replace the fuel hoses on the pick up and return lines because there is some wetness there too.


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    Received the new plastic sending gauge unit and rubber seal and changed it over. Wasn't easy to undo the metal ring that holds it in place and even worse time refitting it. There must be specialist tool to fit that I don't have.
    Went down to the petrol station to fill up the tank to check if it still leaks. Unfortunately the fuel is pissing out worse now. Checked the top of the tank and the leak is obviously flowing from the edge of the new sending unit. Therefore the new rubber is not sealing or I have cracked the new unit.

    Grrr this car has just about beaten me. Does anyone want a CX turbo?


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  21. #21
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    Oh, well, drain it, check and try to seat it again. The tank has an anti-syphon design, so you will only remove a gallon or so from the neck. You may be able to get a hose to pass the weir at the entry point.

    There would be a tool for it, but it would be a very simple two prong affair, so you can probably find a generic item to do the job. I forget exactly, but it may be that the ring can shift to the side a little if you start knocking away at just one side of the ring. Then, it may be applying pressure unevenly on the seal. The tool is meant to allow you to twist it evenly.

    I'd be surprised if you've made this error, but you did place the sealing rubber under the sender unit and not under the ring???

  22. #22
    Fellow Frogger! IE23's Avatar
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    Yes seal under the unit not the ring as it was on the one it removed.


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