[RallySnake]

Rawkkrawler,

Yes that's correct, both pumps are connected at the IN side and OUT side with brass "T" fittings. I am using Carter fuel pumps. Last time one failed, my son and I were coming home from Houston and in the middle of Nowhere, West Texas. We were doing about 80 on the Interstate. When it quit the engine dies and I said, "the fuel pump quit." My son says, "what are we going to do?" And I said, "push this button." I did and we cruised the rest of the 1,100 miles without a problem. That was about the 5th time one failed.

When I first wired the two pumps, I had one running or both running when I pushed the switch. Later, on a rally near Bakersfield, the car bucked to a stop with gas spraying out the top of the carburetor. After trying everything I could think of on the carb, I started thinking about the fuel pumps. I realized that the internal pressure regulator in one of the pumps had failed and I was getting too much pressure. So, I reached up under the car and pulled a wire off pump number 1. Then, everything worked fine and we finished the rally.

I was very unhappy about missing a checkpoint and losing the rally. So, I installed a pressure regulator before the carb. I also changed the wiring so that one pump or the other runs, not both. I also installed a pressure gauge and a NOS pressure switch before the carb. The NOS switch triggers a very bright light on the dash when pressure drops below 4 psi. Then, I installed the biggest fuel filter I could find between the tank and the fuel pumps. Now, the system is very reliable. The light lets me know there is a problem before the car stalls. The gauge helps troubleshoot problems. Last time the light came on, I realized that the filter was clogged. I was able to get home by swerving the car back and forth to move the crud around. It's amazing how much sand comes out of gas station pumps!

I am about to replace all of this with an EFI system. It will also have two pumps and pressure gauge and light. I will sell all of the low pressure stuff on eBay.