SCCA Camaro

I had installed the Holley Stealth Ram in my 68 Camaro SS for SCCA Solo II autocross competition in the CP class, but I still had fuel plumbing to do.  I started with a Walbro 255 external pump (PN GSL-392) rated at 255 liters per hour, some OEM-style fuel filters (WIX 33481), some 3/8ths steel brake lines from NAPA, some 3/8ths tube nuts, 3/8ths barb fittings, 6 feet of 3/8ths SAE J30 rubber fuel hose rated for fuel injection, and some couplings.  I also had a tubing bending tool, and a double flare tool but did a lot of the tubing bending by hand.  The basic drill was the 68 Camaro is an original SS, so had a 3/8^ths fuel line from the tank to the engine bay already.  I decided to use this as my supply line.  From the factory it was a single tube from the sending unit all the way to the fuel pump on the block.  This was unwieldy for taking on and off the car so I cut it in the middle and made a coupling there with a couple of double-flares so it would be easier to manage.  The front half I left alone for now, and the rear half I bent and cut to put the Walbro pump in line.  I initially put a fuel filter in line upstream from the pump as you can see in the picture, but later changed this by putting the filter downstream in the engine bay.  I had already welded a return line into my sending unit and put a flare on the end to act as a barb.  The original sending unit pick-up line had a flare on it with a rubber coupling to the fuel supply line, so all I had to do was use some of the SAE J30 hose here.  Then I cut the back half of the original supply line, put two flare nuts on the ends and flared the tube.  The local NAPA had a coupling to go from the tubing flare nut to the in and out ports on the Walbro pump so I was in business.  I also purchased some tubing clamps from NAPA to secure the tubing. 

In the engine bay I merely bent the fuel supply line up away from the headers, cut it, and flared it for a connection via rubber hose to the supply side of the fuel rails on the Holley Stealth Ram.  Mine was missing the fitting, so I purchased an AN-6 to 3/8ths barb 90 degree fitting to connect the supply line to the supply rail using the fuel injection-rated hose.  Next in the plumbing was the connection from the passenger side rail to the driver side fuel rail, and again I was missing this connection.  Two more AN-6 to 3/8ths bard 90 degree fittings and a length of the SAE J30 hose got the job done here.  At the pressure regulator on the driver side fuel rail the unspent fuel starts its return path to the tank.  Here my eBay-sourced Holley Stealth Ram was also missing the fitting I needed for the return line.  It turns out it was a Saginaw fitting, a metric fitting GM uses for power steering and fuel lines with an odd shoulder flare and an O-ring.  This was very difficult to find locally here in Honolulu, but I did finally find a fuel line repair fitting at Red-Line Auto.  This I screwed directly into the fuel regulator; I flared the other end so I could use some more of the rubber SAE J30 fuel hose to my fuel return line.  For the fuel return line, I used two pre-fabbed 5 feet long sections of 3/8^th steel brake lines from NAPA.  I bent them both by hand to more or less follow the fuel supply line on the passenger side of the car along the subframe and back to the fuel tank.  When the bends were tighter I switched over to the tubing bender so as not to kink the tubing and secured both of the lines to the car with the tubing clamps from NAPA.  Another short section of the SAE J30 rubber hose isolated the fuel return line from the 3/8ths fuel line of the sending unit.  I wasn’t sure yet what I’d do regarding a fuel pressure gauge but thought the rubber hose in the engine bay would give me some flexibility to do that later…

This entry was posted on Sunday, June 15th, 2008 at 5:04 pm and is filed under Building an Autocross Car. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.