I am building a turbo conversion. My regal currently has a 307 V8. I have the entire turbo drivetrain including fuel tank. I am going to be running #8 steel braided line for the main fuel line. I will be using some of the stock line for return. My question is will the #8 decrese pressure or volume to the rail? Is it too big? SHould i use a walbro 340? thanks
Hi Anthony,
Depending on the gas tank and sending unit configuration in your Regal you may or may not be able to use the in-tank GSS340M pump. If not you can use an in-line version of this pump mounted on the underside of the car body and install a sump tube in your tank. Various fitting adapters are available including an AN style to be used with braided line. Using a bigger line can only improve your fuel system performance.
The theory behind this is very simple. By increasing the inner diameter of the hose you are reducing the resistance to flow. This will reduce the workload on the pump. It will increase the volume and pressure the pump can maintain at the fuel rail. A #8 line is the perfect size. This will be large enough to take your car well into the low 10's or better with the right fuel pump configuration. If you are planning to keep this car for a long time you might want to consider some TFE lined hose as the rubber / neoprene lined hose will dry out after a few years thanks to the Xylene, Toluene, MTBE etc in today’s gas. TFE might cost you a bit more now but it could save you more in the long run. Steel line is also very good if you know someone that is good at using a tubing bender. I kept the stock lines in my car from the tank to the front frame. From there I made adapters that converted the Saginaw fittings to AN, and from there to the fuel rail and regulator. This way if I need to replace the lines after a few years I only have to replace a few feet. Having flexible lines in the front of the motor is handy and it gets rid of those restrictive bends in the factory lines that run up the front of the turbo motor.
Here is a link to a picture of my motor that might help: http://www.racetronix.com/JK_BQWK/jmlmotor1.jpg
When you decide to go with a pump contact me and I can fix you up with the right pump, fittings and a custom wiring harness to properly fit your car.
Jack
Racetronix