Plastic diesel tanks - venting?

Submitted: Wednesday, May 05, 2021 at 17:55
ThreadID: 141689 Views:11925 Replies:15 FollowUps:31
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A question for the diesel fuel tank tech heads; I want to put a 100 litre poly diesel tank on the top of my camper trailer. I've had 40 and 50 litre tanks on car roof racks before (with short breathers) and always had trouble with diesel leaking out and staining down the side of the car.

How much does diesel expand? If I have a 100 litre tank but only put 90 or 95 in, do I really need a breather? Tank will be in full sun when it's shining.

Or - can you point me in the direction of a good (short) breather that won't leak diesel?

Why do I want to do this? $1900 for a long range tank in the 200 Series. Then you need a rear wheel carrier to relocate the spare. Another $2.5 to $3k or more for that. Poly tank - less than $500. No changes to the car. Gravity fed - no electrics to fail in the desert. No possibility of tank mounting failing or tank cracking. That's why.

(Please note; I do not want this to turn into a discussion about "all that weight on the roof!" My camper can easily handle it and I know all about raised centre of gravity and it's effects (44 years in the crane & rigging game) I know how to tow to suit ;-)
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