Peugeot 306 hdi missfire/hesitation

[paulpope33]

just been given to diagrammes of the breather system i just have to find what one is on my car what would be the best way to find out would i have to take the tank off the car

[Northern_Mike]

Sounds like it's the cap that's at fault from what you say. Just replace it.

You'll probably be able to see a little pipe inside the fuel filler pipe if you look inside. That'll be the tank breather. If the hole in the cap is blocked it creates a vacuum and can't such fuel through.

I had an Orion 1.6 years ago that did this. It actually sucked the tank out of shape so much that the gauge read 1/2 full when it was empty. I only learnt about the problem when I, you guessed it, ran out of fuel one night. I'd driven 250 miles or so much slower than my normal speed but was still surprised at how little fuel I'd used. Of course, with the tank being sucked in like someone sacking a plastic bottle, the sender from the gauge was resting on the bit that had been sucked in and I didn't really have half a tank left.

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[paulpope33]

i cant see any hole in the cap

[Northern_Mike]

I've just taken a couple of pics of the breather arrangement on my C5 HDi. I'll upload a link later.. just off to work now.

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[paulpope33]

thank you

[paulpope33]

what ive done for now is drilled an hole in the fuel cap so at least it can breath

[RichardW]

Caps are supposed to be sealed these days I think. If you post up the last 8 digits of the VIN, I can look up to see what breather arrangement is fitted. I'm a bit surprised that tank breather problems can give running issues on one of these with that socking great LP pump, and without triggering the EML, but there's a new one everyday!

[paulpope33]

I will post the last 8 tonight when i get in from work since drilling hole in the cap the car as been running perfect

[Northern_Mike]

Caps are supposed to be sealed these days I think.

They may well be but a 306 HDi isn't going to be that new is it? My C5 HDi certainly has a breather in the cap.


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[paulpope33]

Why don't all cap's have breathers

[paulpope33]

Caps are supposed to be sealed these days I think. If you post up the last 8 digits of the VIN, I can look up to see what breather arrangement is fitted. I'm a bit surprised that tank breather problems can give running issues on one of these with that socking great LP pump, and without triggering the EML, but there's a new one everyday!

My last 8 numbers are 32911919

[Northern_Mike]

My C5 HDi has a cap like this. The little rectangle hole is the breather.



I gather these holes in the filler neck insert are something to do with the breather arrangement

[paulpope33]

mine dont look like that i take photo then upload

as you can see i have drilled an hole in the cap to let the tank breath

[RichardW]

Here you go:

breather:



Filling duct





Not clear where the breather is on yours Mike- but that hole in the cap looks like where the tether should be attached on the drawing in service.citroen.....

[Northern_Mike]

Maybe it should Richard However, if I put my lips on the cap, I can certainly blow through it. Doesn't taste great mind you..