Re: Fred's Series 23 fuel pump

Posted by Fred Puhn On 2013/10/6 11:55:38

Step 1 reveals that there may be a better way of putting the electric pump in the system. I originally planned putting the electric pump in line before the mechanical pump. However if you run both pumps at once you get more fuel pressure than the carburetor wants and you may need a fuel pressure regulator. I have had the cheap regulators fail on several cars, and they do not look original. All bad.

After reasearch on the various PI posts I find a strong reccomedation to put the electric pump in parallel with the mechanical pump. That has several advantanges:
1. No chance of pumping the gasoline into the engine through a failed mechanical pump diaphragm.
2. No rubber hoses under the car where they could be damaged.
3. Fuel pressure at the carburator may be low enough to eliminate the fuel pressure regulator (this depends on the electric pump pressure).
4. Electric pump can be mounted in a cool spot near the front of the car where mounting might be easier.
5. It is easy to test the electric pump versus the mechanical pump if a switch is used.

I plan to investigate this in more detail before I cut metal.

Also I need the mnechanical fuel pump gaskets and the insulating plate between the pump and the block.