Airtex fuel pumps

[HCO41]

I just ordered a DPDT center off momentary/maintained switch that I plan to have in line supplying power, though the ignition switch, to the 6V pump on my '37 and '50. That way I can prime the carb. for initial startup with momentary side of switch or have it run continuous, on the maintained side, in case of vapor lock situations. The switch can be had from Surpluscenter.com. It is item number 11-3279 and cost $3.20 + shipping. Shipping's a little steep so get a few friends together if you think it's a way to go. SPDT would work but I didn't see one, but I have a spare set of contacts if needed.
Howard

[Johnnydidd]

Help me understand? I have an electric 12v holly fuel pump only. If I put a mechanical pump in series will it pull through the electric pump shut off, if not how do I plumb around the electric pump shut off so I can use it for backup?

[JSeery]

Originally Posted by Johnnydidd

Help me understand? I have an electric 12v holly fuel pump only. If I put a mechanical pump in series will it pull through the electric pump shut off, if not how do I plumb around the electric pump shut off so I can use it for backup?

See post 29. Think it would be easier to change pumps.

[G.M.]

Originally Posted by Johnnydidd

Help me understand? I have an electric 12v holly fuel pump only. If I put a mechanical pump in series will it pull through the electric pump shut off, if not how do I plumb around the electric pump shut off so I can use it for backup?

If you can blow through the electric pump from the tank end with your mouth the mechanical pump will pull gas through the electric pump. If the electric pump has a check valve in it you can blow from the tank side but not from the engine side. With a lite check valve you can blow through from the tank side with your mouth the mechanical will pull through that also. G.M.