You shorted out the circuit, causing sparks before the fuse blew or breaker tripped. Go to the fuse box. Is a break tripped or a fuse burned out? (You will have breakers or fuses.) That's because of the short.
If low indicator pops measure the gap from the pickup tube to the floor of the pan also. Clay or play-dough works well. The o-ring on the pickup tube should be a noticable "pop" of sorts into the bore, if you dont feel the little give in it then it may not be sealing properly.
Its possible to use a propane cylinder on vertical side, however its not advisable. The problem is that the gar regulator is designed for gas, if the propane cylinder is full there is the potential for the liquid to be drawn into the regulator at cause an over pressure.
I am using the P saginaw pump. It was all fine after a few months that I heard a lock to lock noise, don't have any idea where the noise is coming from.