Electrical: Electric Fuel pump

[ken-renda]

The 54 commander is positive ground, can a negative ground electric fuel pump be used? Ken, Deltaville, Va

[Mike Van Veghten]

Yep...just swap the wires at the pump.

BUT...remember, unless you buy a "really" low output pump, you'll also need a regulator to drop the pressure.

I've got a Carter 7psi pump on my, 6 volt, positive ground, 54 wagon. All set up to be correctly redone when the 299 goes in.
So far as it stands this combination has about 2500 miles on it with no problem. Currently adjusted to 3 psi for the flat head 170 in it now.

Mike

[ken-renda]

Yep...just swap the wires at the pump.

BUT...remember, unless you buy a "really" low output pump, you'll also need a regulator to drop the pressure.

I've got a Carter 7psi pump on my, 6 volt, positive ground, 54 wagon. All set up to be correctly redone when the 299 goes in.
So far as it stands this combination has about 2500 miles on it with no problem. Currently adjusted to 3 psi for the flat head 170 in it now.


Mike

mike, thanks, ken

[whacker]

If you get one of the pulse type pumps that go "tick-tick-tick", they are not polarity sensitive. They are really just an electro-magnet with a switch. It will work on either positive or negative ground.

[RadioRoy]

I always buy the ones made for imported cars. They say something like "3-4.5 pounds" pressure. They work great to assist the mechanical pump and will not overpower the carb inlet.

[gordr]

There are some polarity-sensitive pumps out there. The "Facit" brand comes to mind. They look like a little metal cube with a hose barb on two opposing faces, and a large power transistor on one of the other faces. Very similar pumps were used in many Mazda rotary-engine cars.

Any device with solid-state components, e.g. transistors, in it will be polarity-sensitive. And rotary pumps may run in reverse if hooked up with incorrect polarity.

There's a simple solution: simply mount the fuel pump on a sheet of thick rubber, and bolt the rubber sheet to the car frame, ensuring that the screws holding the pump to the rubber cannot make contact with the frame. With a short length of good-quality neoprene hose on each nipple, the pump is electrically isolated, and noise transmission to the car interior is greatly diminished, too.

[RadioRoy]

Good information Gordr.

You can also secure the pump to the rubber to the frame with plastic tie wraps.

Do they make electronic pumps in 6 volt?

[dnevin]

Good information Gordr.

You can also secure the pump to the rubber to the frame with plastic tie wraps.

Do they make electronic pumps in 6 volt?

Fifth Avenue Garage sells one. http://www.fifthaveinternetgarage.co...counter_3.html

[Mike Van Veghten]

I've got a Carter 7psi pump on my, 6 volt, positive ground, 54 wagon. All set up to be correctly redone when the 299 goes in.
So far as it stands this combination has about 2500 miles on it with no problem. Currently adjusted to 3 psi for the flat head 170 in it now.

One thing I forgot to note...the Carter pump is a modern 12 volt pump (negetive ground)...so far, working well on 6 volts (positive ground)..!

Mike