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Home > Puma (Tdci) > Air in fuel at a quarter of a tank… fine otherwise!
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Fin2020



Member Since: 13 Aug 2021
Location: Central Bedfordshire
Posts: 2
United Kingdom 2011 Defender 110 Puma 2.4 PU Blenheim Silver
Air in fuel at a quarter of a tank… fine otherwise!
Hi,

I wondered if anyone has had the same problem with their defender puma (mines an 11plate).
It runs fine all the time… well fine for a defender! But when it gets to a quarter of a tank it starts sucking up air into the fuel lines from somewhere and dies! Now my obvious conclusion was a split in the fuel sender pipe in the tank about a quarter of the way up… but I’ve replaced this and couldn’t find anything wrong with the old one! It’s just strange that it doesn’t have a problem until a quarter of a tank? Any help would be really appreciated.

Thanks
Post #916676 13th Aug 2021 9:20am
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
fuel tank air vent Question
Post #916710 13th Aug 2021 11:13am
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Fin2020



Member Since: 13 Aug 2021
Location: Central Bedfordshire
Posts: 2
United Kingdom 2011 Defender 110 Puma 2.4 PU Blenheim Silver
The fuel tank breather pipe that runs back up to the “fill up” pipe? Replaced it when I dropped the tank because it had completely perished… still having the problem though, and would that cause air in the fuel line?
Post #916734 13th Aug 2021 12:55pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
ok I had one pulling small vacuum on the tank and air being pull in from bad fuel line fitting ( the o ring seal in side fitting had naked )
Post #916747 13th Aug 2021 2:03pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
dorsetsmith wrote:
fuel tank air vent Question
Post #916751 13th Aug 2021 2:26pm
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Badger110



Member Since: 06 Feb 2018
Location: South hams
Posts: 1039
United Kingdom 2011 Defender 110 Puma 2.4 USW Buckingham Blue
It took me weeks to find the culprit of air being introduced to the fuel, turned out to be a split filter housing.

When hotter fuel is returned to the filter housing it causes the split to open, allowing air in.

Unrelated to how much fuel is in the tank, but worth noting Wink
Post #916836 13th Aug 2021 9:32pm
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