has anyone here done an electric in-tank fuel pump conversion on their old mopars? I need some pointers.. ie, what brand works best, do I need to run a regulator? Im considering running one in my 71 340 roadrunner and want it to be well hidden. any help is appreciated!
-keivn

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The pump you chose will depend on a number of variables.
EFI or Carburettor?
You will need to run a pre- and post- pump filter. if you're running E85 make sure the filter elements are stainless.
You will need a regulator as well.
I would also mount the pump on insulators inside the tank to reduce vibration. Mount it in the fuel (i.e. in the bottom of the tank. I would also run a return line - carb or EFI, keep the fuel cool and circulating.
There are a million types and sizes etc of pumps I am sure someone will chime in with something they use in their application. Aeromotive are good although I know many others are also good.

wow, that looks very elaborate! Im running a FAST legal 340 (426) so id have a modified thermoquad.. is it absolutely necessary to run a return? is there any way to avoid using a regulator? Im thinking about something more simple like the picture shown below.. any pointers about something like this? thanks
-kevin

also, what psi would be adequate? thanks
-kevin

For PSI and regulator... I'm not an expert but I believe Thermoquads like to see 5 psi... not much more.

The injection type pumps you would likley use are typically used with fuel systme operating pressures around 40 psi. They can build 80+ psi if deadheaded. Most aftermarket injection type pumps need a return regulator. A lot of OE setups integrate the regulator in the in-tank unit.

If you could get an OE setup with integral regulator, a Holly regualtor added before the carb would drop pressures down from +/- 40 PSI to a safe level for the Thermoquad.

I've seen the pic you posted of an injection pump mounted to a stock pickup. That idea hasn't caught in for injection. The pump really needs some kind of a sump to maintain fuel flow as the gas sloshes aroung. Its not so critical on a carb vehicle as fuel in the bowl can cover a momentary interuption of flow.

All this is possible. If you have the option of running a standard mecanical fuel pump, that would be a lot easier with a carb. If you don't, a carb style electric mounted on the frame rail might be a good option.

thank you very much! very good info. my engine builder recommends that I run an electric pump to avoid vapor lock. the only reason I want an in-tank pump is to make it a little more invisible. what recommended regulator would be good enough for this application? thanks
-kevin

Go to this post in the Tech Archives, and scroll down till you see the pic of the stainless gas tank. Good info there on this subject, but it may not apply very well to what you need. https://board.moparts.org/ubbthreads/show...e=1#Post3930520 There is also somebody that is a member over at FABO (For A Bodies Only) that takes brand new stock tanks and installs the same Walbro pump for about half what Rock Valley Charges for the setup in the link. This may not have helped, but it's all I can remember about in tank pumps. Good luck.

With an electric pump you will need a regulator. You can adjust these for 5-6psi at the carb.
A return line will reduce/eliminate vapour lock by way of recirculating the fuel to keep it cool.
If you are experiencing vapour lock simply adding an electric pump and dead-heading it will not solve the problem as you won't have really changed anything.