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Originally Posted by camcojb
I'm all for any return other than after the rails; grab ahold of the fuel rails after the engine is completely up to temp and been driven for a while. The gas is in there much longer than if the exhaust pipe gets close at a small point in the line. Neither are good however, but I think insulating the fuel line near the exhaust will definitely help, but if you're going through the rails to bypass you still may have issues.
By the way, many of the new oem cars are regulated in the tank (Vettes, GTO's, etc.) or do not have a bypass from the fuel rails back to the tank (Lightning, etc.). I ran a couple cars regulated back by the tank and they worked flawlessly.
Jody
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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: