Vehicle & Technical > Defender

Fuel Tank

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Mark Y:
Anyone got any idea why my defender TD 90's fuel tank is pressurised, I opened the fuel cap and it nearly flew out of my hand there was so much pressure in the tank, :shock:

trecfive:
Tank breather blocked.

J.D.:
Yep the breather is blocked or is got trapped between something.

Got down an aquatic shop and get some airline and just replace the breather, lot easier than trying to unblock it.

Mark Y:
Cheers for the advice, will have a go at the weekend.

Les Henson:
This is quite common on the TD engines.
Breather blockage would cause suction, not pressure (fuel out to engine - no air in = vaccuum)
The boost diaphragm on the Injector pump splits on these engines - causing pressure to go back to the tank, which then causes the cap to blow off as you undo it. Take the boost pipe off after running the engine for a while with the cap on - if there's fuel in it, then the diaphragm is split. You can replace the diaphragm without removing the pump, and it's pretty straight forward to do, although the cover bolts are fiddly to get at.

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