LIME TWIST DART
Well-Known Member
What's better, pre or post carb location for fuel pressure regulator? Particularly for a return style. I know closer to the carb is better and staying away from high heat sources is recommended. I have seen differing opinions about running it pre or post carb. In my case, with a dual feed, there is also the option to install between each feed. Of course between is still before. Tech from Mallory says ALWAYS before the carb. It seems that regulating pressure has to come before the intended target, right? However, I have read arguments that a regulator after the carb pressurizes the entire line. Not sure I buy this, but maybe so and does a return make a difference? If it does, what advantages can there be anyway? I plan on locating my Mallory 4307 m, return style, on a bracket between the feeds like the one pictured below. It seems logical to install it before the feed. I wanted to get opinions and settle this before I buy the bracket, feed and fittings. In case it matters: 413 stroker, 4781 850cfm Holley, 1" tapered spacer, Victor 340, 4000 stall, 3.91, Holley electric Black pump and Mallory 4307M return style regulator. Street driven, but no where close to daily. 3rd pic is my carb.
If there is already another good thread on this, please let me know.
Thanks!
If there is already another good thread on this, please let me know.
Thanks!