Member Since: 16 Feb 2016
Location: vancouver
Posts: 14
the dreaded farting sound from gas cap
I am new to the Land Rover world, but have jumped in blindly, am an Audi guy to.
I am getting the farting sound from the gas cap, the vacuum in the tank then it blows the gas cap valve.
the local dealer told me it is more than likely the dmtl valve which is now replaced but it still makes the farting sound. i have searched and read through many threads but i havent found much in terms of concrete answers.
plugged evap canister? or faulty purge valve (the purge valce does tick when the engine is running)? any thoughts?
2006 4.4 HSE LR3
Last edited by rovertron on 8th Mar 2016 12:06 am. Edited 1 time in total
7th Mar 2016 12:08 am
rovertron
Member Since: 16 Feb 2016
Location: vancouver
Posts: 14
Anybody on this one?
8th Mar 2016 12:05 am
Narpy
Member Since: 18 Jul 2011
Location: Stockport
Posts: 7830
When are you getting this sound and what exactly do you mean by the phrase "gas cap"?
The only reference I've ever heard to farting is after parking up the suspension vents to level the car. This usually happens just as you're walking away having locked the car. Does this sound familiar?
If this is the sound you're hearing and I've understood correctly by "gas cap" you mean fuel filler cap, I think you could be mistaken thinking that this has anything to do with the fuel filler cap. Mods:
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Last edited by Narpy on 8th Mar 2016 12:36 am. Edited 1 time in total
8th Mar 2016 12:29 am
rovertron
Member Since: 16 Feb 2016
Location: vancouver
Posts: 14
with engine running (after 5 minutes from cold start) there is a farting noise coming from the gas cap every 30 seconds to 1 minute. it appears to be the gas cap releasing vacuum pressure.
if (with engine running) i remove the gas cap there is a huge vacuum sound. so i am thinking its the gas cap safety release valve popping with excess vacuum.
The dealer told me to replace the dmtl valve so i had it done at the dealer. and still makes the noise.
Last edited by rovertron on 8th Mar 2016 12:39 am. Edited 1 time in total
8th Mar 2016 12:36 am
Narpy
Member Since: 18 Jul 2011
Location: Stockport
Posts: 7830
Sounds like a totally different fart.
Good luck with resolving it.Mods:
Front Fogs + Halos
FBH Remote Control
The 1st Ever RRS Modded Grill
Garmin Nuvi + D4 Surround + Reversing Camera.
D4 Steering Wheel.
Rear Boot Spoiler.
Twin Brake Lights.
Wing Mirror Indicator Repeaters.
Long Roof Rails
Make your own Narpy grill thread
I'm not scared, I'm outta here.
8th Mar 2016 12:37 am
rovertron
Member Since: 16 Feb 2016
Location: vancouver
Posts: 14
that video is the exact same thing i am encountering with my gas cap.
please help
8th Mar 2016 10:57 pm
L319
Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2080
Is it worth changing the cap itself to eliminate it from the equation? It might be operating a too lower pressure.
9th Mar 2016 12:01 am
rovertron
Member Since: 16 Feb 2016
Location: vancouver
Posts: 14
Yes, sorry I forgot to mention that I have replaced the gas cap along with the dmtl valve
9th Mar 2016 12:43 am
caverD3
Member Since: 03 Jul 2006
Location: Oberon, NSW
Posts: 6922
Fuel cap in English. “There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely gamesâ€
Ernest Hemmingway
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9th Mar 2016 1:19 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
A bad purge valve would be top of the list.
The farting noise is a good thing and is the vehicle protecting the fuel tank from collapsing. When you drive the fuel will be warm and the amount of vacuum in the tank will increase. When you park in cooler conditions the fuel volume decreases which increases the pressure difference, so it farts to save itself and prompts the owner to get it fixed.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 18 Sep 2013
Location: Wirral
Posts: 136
I had a Vauxhall Midi van years ago, a main dealer sold me the wrong (none vented) replacement fuel filler cap. The vacuum completely collapsed the fuel tank, it ended up looking like a screwed up crisp bag!
9th Mar 2016 11:59 pm
rovertron
Member Since: 16 Feb 2016
Location: vancouver
Posts: 14
I will look further into testing the purge valve, all though touching it reveals it is clicking but valve could be stuck i suppose.
10th Mar 2016 12:11 am
rovertron
Member Since: 16 Feb 2016
Location: vancouver
Posts: 14
ok pulled the purge valve, checked and tested and its good. im still baffled with this one.
so far ive been told:
-possible vent valve on top of fuel tank
-possible dtml ( just replaced)
-possible carbon canister
im kind at a loss here with this one.
14th Mar 2016 7:19 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
From this point on you really need a smoke machine to see what is going on.
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