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        General >> Problems >> Filler cap hissing ?
        
(Message started by: Dean on Feb 5^th, 2005, 1:09am)

Title: Filler cap hissing ?
Post by Dean on Feb 5^th, 2005, 1:09am

Hi Guys
yes its me again, when i go to fill my Cossy up and unscrew the filler cap i get a hissing noise ? i don't know if this is caused by presure or buy a vacuum ? is this normal ? i thought the tanks were supposed to be vented ? and with the MOT looming i am worried that the old girl might fail on this

cheers

Dean ;)

Title: Re: Filler cap hissing ?
Post by Vulcan on Feb 5^th, 2005, 1:53am

Yep this is totally normal... most cars I've had for the last 2 or 3 years have done this. I seem to remember a post that said if your Scorp didn't hiss when you open the cap then that was time to worry...... ;D ;D

Title: Re: Filler cap hissing ?
Post by johnv on Feb 5^th, 2005, 7:25am

god, i better start to worry then, because none of my cars do that

Title: Re: Filler cap hissing ?
Post by Badboytunes on Feb 5^th, 2005, 10:07am

my scorp did it. as does my escy, lynns ~~ROVER~~ :-[

Title: Re: Filler cap hissing ?
Post by mr._floppy on Feb 5^th, 2005, 11:31am

Yes, it's perfectly normal, somewhere on this site there is an explanation for the hissing.

Title: Re: Filler cap hissing ?
Post by waders on Feb 5^th, 2005, 6:44pm

on 02/05/05 at 07:25:46, johnv wrote:

god, i better start to worry then, because none of my cars do that

John, get your ear closer to the cap, it should hiss a little as you undo it.

If they don't hiss, do you tighten the caps 'till they go click? You should!

waders.

Title: Re: Filler cap hissing ?
Post by Dean on Feb 5^th, 2005, 7:09pm

Thats ok then......thanks guys

Dean ;)

Title: Re: Filler cap hissing ?
Post by scorpio_man on Feb 5^th, 2005, 7:31pm

hi there

this is the page refered to....

http://www.fordscorpio.co.uk/evapmonitor.htm

hth

Title: Re: Filler cap hissing ?
Post by johnv on Feb 5^th, 2005, 10:48pm

hi to waders, yes i screw down till i get it tright and it gives one solid click.

Title: Re: Filler cap hissing ?
Post by Vulcan on Feb 6^th, 2005, 6:50pm

This part of the page describes why it should hiss...

DRIVEABILITY CONCERNS
The EVAP system does not effect the operation of the vehicle. It is possible that a disconnected vacuum pipe beneath the vehicle in the Fuel Tank area could cause an unmetered leak in the Inlet system and cause poor idling.

The only way in which a driver may decide that the EVAP system is not working is when there is no hiss of vacuum as the fuel cap is released after the engine has run.

Mine hisses like a trapped Rattlesnake... ;D