One of the issues with always on fuel pumps is heat. The Carter rotary pump is a very good design…but…long periods of idling can cause it to overheat and kill itself.
Many years ago, I talked with the Carter Engineers, when it was still Carter, and they told me to take a tee and machine a brass slug with a hole in it, I think it was 3/32” and
then press it into the tee.
Then plumb in a return line to the tank so that there would always be a bleed of fuel back to the tank. That 3/32” was enough so that the pump would never overheat.
An added benefit is that in stop and go traffic you got cooler fuel up to the carb as the heat soak was being drawn away and back to the tank.
By two cents worth. James
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx
<chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of
John Grady
Sent: Thursday, July 17, 2025 05:27
To: dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: leslie miklas <ldmiklas@xxxxxxxxxxx>; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} Electric fuel pump recommendation
the carter pump , the lower pressure one , is reliable and a long time proven design , but if mounted using their bracket ,it transmits noise to the frame Their little rubber
grommets are a really lame attempt at fixing that . I agree aggravating noise . …
I am experimenting with letting it hang by the rubber coupling hoses by securing them on each side 3-4” away from the pump by main bearing- like hose clamp blocks . Car not
done yet
I would use FI rated hose to get good reinforcement ( cord in the hose) . It ought to be a lot quieter
I also see they came up with an in tank pump ( like an FI pump) that has the low pressure output for carbs.It is small. I bought one but have not tried it . It looks like it could
be secured to our gas gauge float bracket .
One does not hear the 50 psi fuel injection pumps in tanks … but seems crazy to use that 50 and a regulator , thought about that , too much to go wring in bad ways. but then
saw this carb pump—-
Interesting issue , I hope someone tries faster than I will get to it and reports back
By the way there is an oil pump pressure switch used in late 70’ s dodge trucks 318 that can supply power to FI pump relay oil over 5 psi ,you use a tee I wire that from ign
through a 1N4007 diode to the pump relay and also another diode off the start wire . Line on diode toward relay . 10 A fuse on power .
--
For archives go to
http://www.forwardlook.net/300-archive/search.htm#querylang
---
You received this message because you are subscribed to the Google Groups "Chrysler 300 Club International" group.
To unsubscribe from this group and stop receiving emails from it, send an email to
chrysler-300-club-international+unsubscribe@xxxxxxxxxxxxxxxx.
To view this discussion visit
https://groups.google.com/d/msgid/chrysler-300-club-international/212C8EF5-E0E4-44FA-B5DF-983D6D9A464F%40gradyresearch.com.
You received this message because you are subscribed to the Google Groups "Chrysler 300 Club International" group.
To unsubscribe from this group and stop receiving emails from it, send an email to
.
