You can do a search for the little giant pump on the web. Grainger has it but found it cheaper somewhere else once. Funny thing, it cam e from Grainger. Have one close by and could have picked it up, but from the third party with shipping it was still cheaper.
If it's a Coleman save yourself a headache and just cut and remove hoses inside the machine and replace with nylon braided hoses and clamps. Hard to re use the old hoses.