Dave,
Unfortunately most tanks have the capacity on the top.
A quick phone call to Jayco should get you the answer you seek.
Cheers, Ozjohn.

Jacko wrote:

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Darling if you measure the tanks in CM LxBxH=Total Volume

Darling here is an example for you

80cm x 50cm x 15cm=60,000/1,000=60L  There you go darling simple as and even blonde Jacko can do it. So darling no doubt you can do it.

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Can't we dispense with some of the "darlings"?  Also I think the response trivialises a quite sensible and intelligent question from a very welcome newcomer to the forum.

It may be that the tank is not rectangular in shape or is located in a position where it would be difficult to measure.

I haven't had to do this so someone may have a "handy hint" but my suggestion would be to fill the tank then drain it into a bucket with a known volume (capacity).  It may be necessary to measure the capacity of the bucket first rather than assuming it's volume.  (Assuming a call to Jayco doesn't come up with an answer)

-- Edited by jimricho on Wednesday 22nd of June 2011 07:00:57 PM

thanks jimricho best sugestion iv heard thanke for your time   dave

Ring Jayco Direct no sense talking to the the monkeys ( salesmen) when the organ grinder has the answers on tap may even pay to have the chjassie number on hand in case it was a special order and non standard tanks were fitted

moosebarter wrote:

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thanks wombat just did that 82 ltrs per tank thanks everyone for your help

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 As I said in my post. "Phone Jayco"!
And there you go. Just ask and your questions will be answered (most of the time).

Cheers, ozjohn.

thanks pete