EVAP canister and fuel tank pressure
Discussion
I have noticed when that sometimes when I remove the fuel cap there is a build-up of air pressure in the tank is this normal?
Car is a Peugeot 307 1.6 16v petrol, TU5JP4 engine, 90k miles.
Reason I have started looking into the EVAP system is because there is a bit of hesitation/judder on the overrun which I suspect might come from the EVAP purge valve opening. Happens on a warm day when trying to hold a lowish speed of say 50mph on a slight downhill. Pulls ok at normal low throttle openings. Doesn't feel like just one cylinder missing, feels more like two or perhaps the throttle valve fluttering about for some reason. Have previously removed and decarbonised Throttle body & flap and replaced body to manifold seal.
The EVAP purge valve is working fine; have activated it with diagnostic software, it modulates correctly, I can then blow through the pipe.
Should the EVAP canister vent tank pressure to the outside air when the purge valve is closed somehow?
Car is a Peugeot 307 1.6 16v petrol, TU5JP4 engine, 90k miles.
Reason I have started looking into the EVAP system is because there is a bit of hesitation/judder on the overrun which I suspect might come from the EVAP purge valve opening. Happens on a warm day when trying to hold a lowish speed of say 50mph on a slight downhill. Pulls ok at normal low throttle openings. Doesn't feel like just one cylinder missing, feels more like two or perhaps the throttle valve fluttering about for some reason. Have previously removed and decarbonised Throttle body & flap and replaced body to manifold seal.
The EVAP purge valve is working fine; have activated it with diagnostic software, it modulates correctly, I can then blow through the pipe.
Should the EVAP canister vent tank pressure to the outside air when the purge valve is closed somehow?
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