Fuel regulator close to tank
 

I have heard its possible but I have not see many people do it. Im running two walbro 450 in tank pumps one will be turned on by the ECU under boost. I was going to run the regulator in the engine bay but could I run it back by the tank. Plan is to run a -8 feed and -8 return.

We've done it on several occasions. Some manufacturers say it doesn't matter where the regulator is, just depends on the pump output and line size. How much HP you planning on? Sounds like a lot with twin 450's. :)

-Dale

I would be happy with 650-700 at the wheels on E85. I went with the two 450's because it didnt sound like a single pump would be enough on E85.

My regulator is mounted near the tank on my 67 and I've had zero issues. From what I read, some people say the short loop heats up the fuel which has a slight effect on performance. I personally think its negligible.

This is true, but also think about mid-engine vehicles that don't have that luxury. Our twin-turbo Ultima GTR had twin Holley pumps right in front of the engine, and the fuel tanks were next to the engine. Didn't have any problems there, and had 820rwhp on 93 octane.
I'd say you'll be fine.

-Dale

I'm running mine just about 2ft away from my tank and running the return right back to the tank from the regulator. No problems driving it all last summer. It's nice since you don't have an extra line to run all the way up to the front. I can also drop the whole assembly with the fuel tank by removing a bolt and one fitting.

One thing I just though of is if I run the regulator in the back I have to run a vacuum line all the way to the back since the regulator is boost referenced. That would be a long vacuum line and lots of chances for it to crack or fail.

Most late model LS vehicles have the pressure regulator built into the fuel filter that is by the rear of the car near the fuel tank but, running E85 which is essentially alcohol, I would consider running a return line form the engine compartment due to the volume requirements of running E85 fuels. Is this a Pro Touring or Drag build? Also running a return off the fuel rail can help keep fuel supply cooler......so little more HP.

Pro touring. Im running a LSA blower and fuel rail so its a single feed only. No way to run a return unless I modified it in some way.

If that's the case, just place the regulator under the hood. Use high quality PTFE hose and you will be good to go.