Member Since: 27 Mar 2015
Location: Nairobi
Posts: 1
Strange "popping" noise coming from the fuel tank
Hi,
I have an LR3 V6 and just recently I have been getting a strange popping noise from the fuel tank filler cap and the engine revs start fluctuating!!! As soon as I take the fuel cap off I get a sudden rush of air into the tank as if a vacuum has built up and the car starts idling fine.......
Can anyone shed any light on what needs to be replaced or what is causing this?
Any help would be greatly appreciated.
27th Mar 2015 3:23 pm
Bushwanderer
Member Since: 27 Nov 2007
Location: Northern Rivers, NSW, Australia
Posts: 2050
Hi Prof,
Is it possible that you have an aftermarket fuel cap?
IIRC the fuel tank vents into the tank filler neck. If there is no further ventilation, this could give rise to your symptoms.
Best Wishes,
PeterThe Bearded Dragon
30th Mar 2015 6:33 am
Sloss
Member Since: 18 Aug 2013
Location: Aberdeenish
Posts: 1691
You could end up imploding the tank as it's not designed for vacuum conditions.
It could be a blocked vent line so best to leave cap slack until you fix it.Stew,
2010 D4 gone but I really loved it
Went back to Merc - C350 AMG
30th Mar 2015 7:08 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
I'm not sure leaving the cap loose on a petrol is a good idea and will probably trigger the check engine light. The problem is likely the breather pipework, the liquid vapour separator or a problem with the charcoal canister EVAP system purge valve.
I'd start the hunt at the purge valve and its wiring. There is a fuse for it in the battery junction box but if that blew I think it would trigger a dash warning as it feeds other stuff too (Fuse 5, 10 amp), but worth checking.
Welcome to the forum!
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