Re: 49 Packard polarity change

Posted by HH56 On 2015/7/15 20:34:22

If it turns out you need a new pump, several have used Airtex pumps which are available from local parts stores or Amazon. Just about any quality electric pump will work as long as the pressure output is not too high. Believe the pressure spec out of the stock mechanical pump for your car is 4 to 4 1/2 psi.

Airtex has three 6v pumps in that range. Packard used 5/16 lines so two would fit with the least problem. If you are relying strictly on the electric pump and just a modern filter I would choose the E8902 rated at 2 1/2-4psi. If the electric is pushing fuel thru the mechanical pump and its built in screen type filter plus an optional ceramic filter at the carb then you can most likely handle the E8011 at 5-8 psi. Both will allow the mechanical pump to pull fuel thru with the pump turned off.

The E84259 rotary pump will require a bit of fitting adaption and if you have the mechanical pump in line, most rotary pumps will not allow fuel to pass unless they are running. It is also a bit higher capacity than what is needed but most rotary types are much quieter than the pulse types.

Was thinking about why the car would not start again. It could be electrical and depending on how the pump was wired, conceivably the pump was damaged and if it was wired to the same terminal the coil is fed from the voltage to the coil could be pulled down by the damaged pump to the point there is not enough spark.