[Grady Clay]

Alan,

I agree with Jamie.

1) ’69 & ’70 had the pump at the fuel tank mounted on the cross-member. IMHO the best location.

2) Yes, your ‘71T had Zeniths originally. They work just fine but are not as adjustable as the Webers for non-original applications.

3) Yes, the front mounted pumps have a pressure relief return directly to the tank. The rear mounted pumps had the same return, just down the tunnel. None of the Factory systems returned fuel past the carburetors (a deficiency IMO.)

4) Yes and yes. The pump is 0.3 bar (4.3 psi) where the pressure relief valve in the pump is spec at 0.2-0.3 bar (2.9-4.3 psi). This is the Porsche 911.608.107.00, Bosch 058096 0009 or supercedes electric fuel pump. It is rated at 80 liters per hour, 2.5A @ 12V, and about 2000 RPM.

5) The fuel flow capacity of a fuel pump is related to the fuel use of the engine (horsepower) and the amount returned to the fuel tank. I have used this pump with ~300 HP engines.

Today, I would use a system that passes the fuel past the carb intakes and returned the unused fuel to the tank while maintaining proper (~4 psi) pressure at the carb needle & seat. The issue is to keep cool fuel at the N&S so it doesn’t flash into vapor when the pressure drops across the N&S.

Best,
Grady