Do NOT block the EVAP line from the canister - otherwise tank fumes will have nowhere to vent --- unless of course you have fabricated an alternative way to let the tank breath... It can build up quite some pressure on a hot day.
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Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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how does a pressure build up i thought it was a vacuum may be im wrong as all waysComment
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This subject has been discussed at length... Fuel vapours build up on a hot day - and need to be vented... They are treated by a carbon canister which has an ECU controller 'EVAP' or purge valve to release metered amounts of fumes into the inlet manifold when its under vacuum.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don'tComment
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Meant to add... the bottom of the carbon canister inhales ambient air from underneath the car to help this 'purging' effect of treated fumes into the inlet manifold. If that bottom vent on the carbon can it blocked then the EVAP system will a) not work correctly and b) put a vacuum inside your fuel tank.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don'tComment
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Dont vent to atmosphere. Tried this on mine and the lack of vacuum in the sump meant oil passing the turbo seals instead of being sucked through to the sump and it smoked badly. Refitted the outlet of the catch tank back to the MAF hose and smoke reduced by 99%1986 Coupe q - 2281cc 3B, chargecooler, 2.75" exh & downpipe, ported head, water injection, CGR box, modified MD357 turbo, 440cc injectors, high power coil.
2004 A4 2.5TDi convertible, re-mapped to 180bhp
2011 A5 sportback 3TDi-Backbox delete, remapComment
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