Re: Fuel pump

Posted by Fish'n Jim On 2023/2/13 11:56:55

Part of the issue has been very poor quality mechanical pumps being sold lately. I went through 4 in a few months for the Cad after rebuild and finally opted to go all electric. They moved production and I wrote the company several times but no change/refunds. Better to rebuild what you got. I rebuilt the '49 P dual pump & carb and had no issues after.
I guess you need to decide if you want electric pump in or out and plan accordingly with your wiring.(and if doing 6 or 12 VDC)
I don't like the "booster" or "primer" toggle switch approach because you may leave it on and flood the carb. Most electrics deliver way too much pressure and flow for carbs. What they're made for, FI, is usually on a loop so it don't matter. But the carb float needle valve is not held very tight. It's a simpler install this way but still needs a fuse and a momentary switch(my opinion) so you don't forget to shut it off.
You can find a diagram for making them "foolproof" online but requires a different oil pressure switch and some relays, etc. I think Airtex has a pump that delivers the correct pressure for carbs without external regulator, but as I found it's rather noisy. (not sure if 6V available) Most require a pre-filter so maintenance and placement issue.
I put fuel pressure gauges in my carbed vehicles.