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Hello, when i fill up my tank to the maximum, and get in the car after some hours, my car smells of gas. What could be the issue?
 

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Hi....gas?...exhaust gas?petrol fumes?diesel fumes?..perhaps you are filling the car and the weather (being hot)may make the fuel expand out of a tank breather...any sign of leaks under the fuel tank?...ps hi
 

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By gas i meant the fuel odor :D No leaks under the car, nor in the trunk or around it. This happens with me just when i completely fill up the tank, the smell goes away right after i move the car. And when the tank is 3/4 no smell is detected at all.. That's what is making me not sure about what's happening there
 

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The most common cause of the smell of gas in any of my cars is egg mayo & ham sandwiches a few hours before!

But I'm going to go out on a limb and assume gas meaning fuel. if it does this every time you fill it, not just in hot weather, then first thing to look at is the area around the tank sender. Lift up the rear seat base on the left hand side of the car. you should see a very large plastic plug, about 15cm+ in diameter. remove this and you will see the tank sender, pipes and electrical connections. Look for any sign of fuel dampness anywhere. If there is around the top of the tank then suspect the rubber O ring that seals the sender to the tank. If it's in the top of the sender (it's a complicated plastic moulding with areas that will trap and puddle any fuel) then the suspect bit will probably be where the electrical connections come through the top of the tank.

Note. Due to a redesign of the fuel system for the HDi cars, a larger sender unit incorporating a first stage low pressure fuel pump was included. This meant a larger sender unit. However, peugeot didnt think it worth while to redesign the tooling that stamps out the floor pan, as a result the hole in the floor is too small to get the sender out. If you need to do this, you either drop the tank, which is a lot of hassle, or butcher the floor. The latter is done by making a series of cuts around the edges of the hole to create 'tabs' that can be bent up out of the way. If you lift the seat and find this has already been done then it means a previous owner has had this problem in the past.

If you have to remove the sender it's held in place with a large, screw on plastic locking ring. The sealing O ring may simply have been incorrectly seated as it can be quite fiddly to keep in place while the sender is dropped into position.

In the above I've assumed you have a HDi, it being the most common for that year car. I may be wrong though. It would help enormously if in future you include more details about the car.
 
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