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mrodey



Member Since: 18 May 2023
Location: Svedala
Posts: 31
Sweden 2009 Defender 110 Puma 2.4 CSW Scotia Grey
2.4 Puma losing fuel prime?
So I've been working on this for months and still can't figure out the problem. My 2008 Defender 2.4 suddenly stopped starting. She turns over fine, battery is new, new filter, starter recently replaced, etc.

The ONLY way I can get it to start it to use an air compressor to blow air into the fuel tank (wife) while I press the air release valve on the fuel line in the engine compartment until fuel comes out then quickly start up the car and after 30 seconds she will fire up. If I shut it off then after 10 seconds she wont start again till I pressurize the tank.

I've inspected all fuel lines but see no fuel leaks or cracks. Any suggestions from people who have this problem of what could cause fuel to drain back into the tank? Can a bad fuel tank vent breather hose allow air in as I'm guessing that is a one way air valve?

I'm out of ideas.
Post #1058966 30th Jan 2025 11:16am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5788
2006 Defender 110 Td5 USW Zermatt Silver
The fuel tank breather WILL allow air into the tank, but that is correct. To me your description indicates that the air leak is fuel supply pipework at the front / engine end of the system and it allow the fuel to run back to the tank.
Post #1058970 30th Jan 2025 11:32am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17539
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The obvious thing that springs to mind would be a leak in the bleed valve (the valve you are using when pressurising the tank) allowing fuel to drain back into the tank when the engine is not running.
Post #1058971 30th Jan 2025 11:32am
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cretesimon



Member Since: 01 Nov 2021
Location: heraklon
Posts: 55
Greece 
Once had one where the plastic fuel sender unit had cracked inside and letting air in to the diesel when trying to find the fault I started engine side by bypass the fuel system and running it on a fuel can straight to the pump
Post #1059037 30th Jan 2025 8:42pm
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