thinking about a fuel regulator...

[poppa]

...just for the (?) cooling effect on the fuel system. Have a small 4.5-5 psi pum by the trunk with the mechanical one. Where would I put this and what psi do I set it at as to not affect psi to carbs (6 pak) ? At the end of the fuel rail? Front ? Thanks for looking

[timmycharger]

I was having fuel boiling issues on my 440 six pack a few years ago. I had a Holley electric pump with regulator set at 6PSI and no return line. 

My fix for this was to add a 1/4 return line that went from the six pack fuel rail back to the tank. None of my lines are factory, they are aluminum and -6 AN fittings. I also covered the lines in thermal wrap.

I now run just a Mallory electric pump with NO regulator with the return line. I have no further fuel boiling issues and without the regulator, it is about 7PSI. Been like this for 3 years w/o issues.

[poppa]

Thanks for the quick reply. Doesn't that then starve the carbs? Or does the smaller return line keep enough for the carbs ?

[b5blue]

I ran my 6BBL for years with no return gimmick and a 12.00 auto part store brand pump. Have you the bigger tube pickup and line?

[timmycharger]

Lol return gimmick. Didn't Chrysler have them from the factory starting in 1970?   

No, my carbs are not starving, I have adjustable metering plates in the outboard carbs and jetted them up. The return line is only 1/4 vs the 3/8 regular line.

[poppa]

My 6 pak is mechanical.
B5 , bigger tube ?
Timmy , I have blocks. How much did you jet up ?
Thanks

[timmycharger]

Here is what I have in there now.  I had them much bigger in the outboards when I was racing it 25 years ago with open exhaust and race gas.

rear carb = 88/90

center carb = 86/86

front carb = 88/90

[poppa]

Wow. That's close to what was in mine until I changed them. No one would drive behind me as the smell was too much. But it went really good. I got 79 rear , 78 front and I think 69 in center. After I figure out this crap , I'll have to experiment . My center is 500cfm and the outs are the 350's .

[b5blue]

I used the factory 318 fuel line for a return and I think the line I added was 3/8. (It was 29 years ago.)