Bob,
Thank you for the answer. I'm wondering how the SW 240 fuel pump was wired on the early cars as delivered from Shelby American? I do not recall seeing any early R-models with separate fuel pump switches, so I assume the fuel pump is wired direct to the ignition switch? I wired my fuel pump to a separate switch with an indicator light in the dash. Fuel pump is actuated and pumps up to 6 1/2 psi for starting and running at all times, but I've been recently seeing a +/- 2 psi fuel pressure fluctuation.
I think I found the problem in the custom Fuel Safe fuel bladder molded to the R-model fuel tank, as the bladder had been degraded by the fuel available in Florida. (93 octane with up to 10% alcohol.) Just sent the fuel tank back to Fuel Safe for repair / replacement on Friday. I think there is a restriction in the fuel pick-up in the bladder, as it would not drain when the fuel line was removed. Fuel cell bladder debris was found in the fuel when finally able to drain. No debris in the fuel filters. Custom fuel cell is about 4 1/2 years old with 5 year prorated warranty.
I'm trying to determine if I want to continue using a full time electric fuel pump or only for pressurizing and priming the fuel system to get fuel to the mechanical pump? I would need to determine an electric fuel pump that allows fuel flow when not activated. Current Mallory electric fuel pump restricts fuel pressure to the mechanical pump when not energized. If a SW 240 allows flow through when not in use, I think I may want to upgrade to an original SW 240?
Any input / suggestions are appreciated.
Thank you.
Don
gt350bp