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I have my jetter in the back of the van. The exhaust goes out through a 2" hole in the floor - this prevents the black air filter as the exhaust fumes don't recirculate. A rotary roof vent would allow air in. The pressure lines in your case would be better to use a bulkhead fitting through the floor which would involve just a 20mm hole. A short hose would then go to a QR on a small plate which again would run through a bulkhead fitting. Crystal ?http://www.ebay.co.uk/itm/3-8-Bulkhead-c-w-Nut-Hydraulic-Fitting-Pack-of-5-/200655945231?pt=LH_DefaultDomain_3&hash=item2eb806be0f
Air cooled engine ? This will be fine running in the van given a reasonable airflow ie the roof vent / louvres. The return hose to tank means you have an internal unloader which should not be left for any extended period with the trigger shut - this will run the pump and unloader hot and fail. It is a very simple job to convert the internal unloader to the more durable type with an external return hose. I would suggest you did this anyway.
You can get lockable grills made up,they usually are fitted across door where exhaust comes out of, or door where hoses are to be trailed out from.Allows airflow, hoses etc to be use but thieves can't get in.Mr B