EFI Bung in head update

I was confused about the return-less system, so did more research and found that the filter and regulator are in the tank. Not a good place to service but they suggest 100,000 mile service. When connecting hoses in-tank, it is essential to use in-tank hose like Gates 30R10, regular hose will not stand being submerged in gas.

The fixed fuel pressure works, but there is an advantage in fuel pressure regulated by manifold pressure when using larger flow injectors or on turbo cars. I have experience with each and desire manifold regulated pressure, since it cuts back fuel some at idle, resulting in improved control resolution.

Many single line systems now monitor fuel pressure with a sensor and control pump motor speed to regulate pressure. This is the best for not heating fuel, and precision fuel pressure regulation. Since manifold pressure is also measured, fuel pressure may be properly regulated for constant differential pressure at injectors, for consistent flow vs on-time.