shipped quickly but product has a few short comings

I will be using the heater in a camper van the fuel hose is too small a diameter to fit over the fuel pump. I can buy the right size but why do I have to? the instructions are difficult to understand the fuel tank doesn't have a fuel line fitting installed. a tricky procedure is needed to remedy. the inlet & exhaust pipes are short. the exhaust pipe needs to be longer so that the gases leaving the pipe are far away from the doors and windows I requested a return, the seller asked for photos (which I sent) but I haven't gotten a reply yet.

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