Hi Don,
I actually use to put propane in my old truck all the time without any pumps from my house tank . I also fill my dad's little propane tank he uses for his Bar-B-Que with no trouble at all . The propane company set up the transfer hose for me . Works great . Yes it does take a little longer to fill without a pump, but it works .
By the way , I was quoted $1.75 gallon yesterday .
Big Al