Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Twingo Discussions by Generation
Twingo II Forum - ('07 – '14)
HELP On fuel tanking problem
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Twingo Forum:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="oscar" data-source="post: 173046" data-attributes="member: 2757"><p>the first thing you have to understand is that when you put petrol into an empty or low tank, you are displacing a lot of petrol vapors inside of the tank and this is handled by the EVAP system (known in the old days as a charcoal canister). When you put fuel in, the liquid level rises displacing the petrol and air vapors inside the tank to the EVAP system which can only hold so much at a given time. if this wasn't in place, when you filled your tank up full ... the lower the fuel level got, the pressure would get negative and your fuel tank would crumple in on itself. there is a pressure relief valve connected to the fuel filler neck which opens to allow in fresh air to enter the tank at certain vacuum to maintain a constant pressure inside of the tank for safety reasons as the fuel level lowers and it only vents one way > inwards into the tank. this could / can allow dirt to be introduced into the system and could block the EVAP lines.</p><p></p><p>remove the EVAP line leading from the tank to the EVAP canister > blow compressed air through to clean any debris out. your EVAP system can fail and not throw up any fault codes, all this is down to something silly like a blocked EVAP hose which will lead to complications like CLICK CLICK CLICK at the pump.</p><p></p><p>that is what neil was referring to, it's the root cause for these kinds of problems.</p></blockquote><p></p>
[QUOTE="oscar, post: 173046, member: 2757"] the first thing you have to understand is that when you put petrol into an empty or low tank, you are displacing a lot of petrol vapors inside of the tank and this is handled by the EVAP system (known in the old days as a charcoal canister). When you put fuel in, the liquid level rises displacing the petrol and air vapors inside the tank to the EVAP system which can only hold so much at a given time. if this wasn't in place, when you filled your tank up full ... the lower the fuel level got, the pressure would get negative and your fuel tank would crumple in on itself. there is a pressure relief valve connected to the fuel filler neck which opens to allow in fresh air to enter the tank at certain vacuum to maintain a constant pressure inside of the tank for safety reasons as the fuel level lowers and it only vents one way > inwards into the tank. this could / can allow dirt to be introduced into the system and could block the EVAP lines. remove the EVAP line leading from the tank to the EVAP canister > blow compressed air through to clean any debris out. your EVAP system can fail and not throw up any fault codes, all this is down to something silly like a blocked EVAP hose which will lead to complications like CLICK CLICK CLICK at the pump. that is what neil was referring to, it's the root cause for these kinds of problems. [/QUOTE]
Insert quotes…
Verification
Post reply
Twingo Discussions by Generation
Twingo II Forum - ('07 – '14)
HELP On fuel tanking problem
Top