Vaccum in diesel tank when cap removed?

Mick, be careful as i had a breather blocked on my way to the cape years ago and the vaccum sucked the sides of the steel tank in an cracked the sides and i lost fuel.
It was a series 3 landrover with a petrol motor ,i converted it to a perkins diesel and when i converted it i did not allow for a breather, as the petrol had a carbon canister which allowed the tank to breathe.

I have noticed the Patrol do the same thing, perhaps not as bad as you indicate. I just had a look because I thought the cap had a breather but I can't find it.

Duncs

Mick,

Sounds like a breather blocked for sure, usually routed from tank upwards to as high a point underneath as possible.

Sure you'd find it with a bit of a ferret around underneath or ramp if available, I'd do it sooner rather than later if it was me though, or you will get problems.

(prob take a grease monkey 10 mins, if hes not trying to rip you off)

Ron

My dad had the same problem on a car he had about 20 years ago. He solved it by drilling 2 1mm holes in the filler cap - one thru the outer hard cap, the other thru the rubber seal, offset by about 5mm to slow fuel evaporation in hot weather.
Probably better to fix the breather, but I thought I'd mention it anyway.
Cheers,
Alex

To the best of my knowledge, they are supposed to be like that. I was told that its designed that way so that it stops excessive condensation in the tank. Also was told that if when you loosen your cap, if you hear the suction, its a good indicator that all your hoses are tight and without leaks, for example.... if when you loosened your cap, you didnt hear the suction, chances are ... you have a loose hose clamp in your fuel line OR a pinhole somewhere in the feed line.

Both my GQ's did it and i have heard many do the same when filling up at a servo.
Ange

Thanks Guys, I might get under it and have a search around. My thoughts would be that it would have a breather somewhere with a one way valve to stop fuel leaking out but would also have a filter to stop it sucking dust and moisture in.

Mick

I have a HJ60 and the breather is behind the rear drivers side panel and comes off the filler pipe just below where the pipe goes to the actual filler before the tank itself hope this helps

Greenant

When i pull up at a pisstop with my donkey, it has a bleep and it farts ...for about three seconds ...My thoughts would be that there should be a one way breather somewhere ...Has anyone any ideas on this one?