A gas vent from the top of the tank connects via a solenoid operated valve
to the carbon canister where the HC is scrubbed out and fed to back to the
inlet manifold. When the engine is switched on the valve is opened
periodically when the ECU thinks it most appropriate so to do. At other
times if the tank gets warm then the petrol vapour builds up and increases
the pressure in the tank by some small amount, probably less than 0.1 bar,
so is of little consequence. If your filler valve is maintaining this
pressure then it is doing what it was designed to do, i.e hold a positive
pressure in the tank but let in air if the tank pressure goes negative.
Hamish
-----Original Message-----
From: Pete M
Sent: Monday, April 25, 2011 12:07 PM
To: Quantum Owners Group
Subject: [Quantum Owners] Re: H4 Roll-over/Anti-trickle-fill valve
On Apr 19, 5:42 pm, Jim Turner <[email protected]> wrote:
Hi
Can the roll-over/Anti-trickle-fill valve assembly be cleaned as mine
appears to be clogged. The pipes appear to be ok but there is a
pressure build up in the fuel tank. (It hisses when opened)
No one else has asked so I will.... Are you sure that it's not
supposed to do this? If you've got a Zetec then I'd expect hissing
whenever you remove the filler cap as, like with most fuel injected
engines, it keeps the fuel system pressurised.
--
You received this message because you are subscribed to the Google Groups
"Quantum Owners Group" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/quantumowners?hl=en
IMPORTANT NOTE: All information presented herewith is provided on an "As Is"
basis, without warranty or the implication thereof. Neither the Quantum
Owners Club nor the individuals associated with the Quantum Owners Club or
in the preparation of the above information shall have any liability to any
person or entity with respect to liability, loss, or damage caused or
alleged to be caused directly or indirectly by the instructions contained
within this or related message(s).
--
You received this message because you are subscribed to the Google Groups "Quantum
Owners Group" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/quantumowners?hl=en
IMPORTANT NOTE: All information presented herewith is provided on an "As Is"
basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor
the individuals associated with the Quantum Owners Club or in the preparation of the
above information shall have any liability to any person or entity with respect to
liability, loss, or damage caused or alleged to be caused directly or indirectly by the
instructions contained within this or related message(s).
