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Originally Posted by Steve1968LS2
The reason is that you get the most consitant fuel rail pressure (at the injectors) by having the reg after the fuel rail. This also eliminates cavitation and other problems.
Also, having the reg after the rail means the fuel flows through the rails at a pretty quick pace is not sitting there when the car is running.
The Aeromotive fuel guy says OEM companies regulate at the tank only to meet emissions standards an evap not necessarily because it's the best way. Also, what works for a 400hp engine may not work as good for a 600hp engine.
I think he could go a long way to fixing his prob by running the return line through a cooler (heat sink) and/or going to a smaller pump (or pump controler)
This is just from my discussions with Aeromotive :shrug:
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I agree on most of that, but I still won't run the regulator on the back side of the rails, if it bypasses fuel to the tank. I made well over 800 rwhp with the regulator at the tank, worked great, no pressure issues at all. The closer to the injectors the better probably, but doesn't mean the rear ones don't work fine.
The Vettes have been regulating back there for several years. My GTO was the same and the fuel pressure cannot be more steady.
I also agree with you, the cooler is a good idea along with a pump controller if available, or better yet OEM pumps.
Jody