Powering a 12V fuel pump with battery charger?

[sixdogs]

I have two 12V pumps and power off old "dead" batteries I have on an occasional trickle charger. "Expired" batteries have powered my 12V pumps for years. I replace when a better one gets replaced but have never been let down. Apparently those pumps don't need much to power them.

 

[newbury]

Do you have any old junked "PC's" around? IIRC the power supplies usually had a 12 volt out.

 

[4570Man]

A heavy duty battery charger would have no problem at all. A lighter duty charger that’s more common probably doesn’t supply sufficient amperage. I’d a lot rather use an old battery and trickle charge it every now and then. I usually keep really dead batteries laying around to turn in for a core and then keep sorta good batteries when I take them out of starting service. One of those sorta good batteries has been on my fuel tank for a good while and pumped hundreds of gallons.

 

[LittleBittyBigJohn]

Turns out this is a moot point... I put about 50 gal in the tank, I hooked it up to the tractor battery and the pump did not come on. Fiddled with it a little bit then noticed the pump motor was super hot. I took the motor off the pump and the shaft would not spin. Took the face plate off the motor and the armature was rusted tight in the motor enclosure. I broke the output coupler/ shaft of the armature while trying to free it. My neighbor gave me an old manual diaphragm pump. I'm going to clean it up, test it, then use it for a while if it works.

 

[grsthegreat]

Yeiks…that pump should have had a fuse inline to blow and prevent the heat build up. Thats scary.