with a fuel pressure regulator do you need a return line to the tank or is that only with turbo minis?

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1152cc turbo A-series now with 125.7hp at the wheels !

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Not necessarily, the fuel regulator i have restricts pressure in the line and has no return outlet to the tank. I know the regulators for high pressure fuel lines e.g. fuel injection always have a return to the tank. I think this is to take the load off the high pressure pump more than anything. My local autopro sells the low pressure type with no return feed on the shelf near the reline gear. I can't remember what brand it is and the label has peeled off... profuel rings a bell but not sure.

Probably you're thinking of Purolator...
They work but I've heard the calibration marks are crap. I'd buy a 0-6psi gauge to check.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

so a return is only needed for high pressure pumps

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1152cc turbo A-series now with 125.7hp at the wheels !

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Generally speaking, but there are always exceptions.
The new Monaros have a high pressure pump at the tank, but only one line to the engine
(the return goes directly back into the tank).

Make sure you read the fitting instructions for whatever you intend to purchase to make sure it will suit your requirements.

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Too many cars, and too little time.

The fuel pressure regulator in a fuel injected situation is designed to maintain a constant differential presure between the the pump pressure and the plenum pressure. The plenum is connected to the fuel regulator and this controls the pressure by bypassing the fuel back to the tank. this maintains a consistent pressure drop across the injector, if this was not the case the flow from the injector would vary and be harder to contol. A normal regulator has a spring that the diaphram works againts. The pressure is adjusted by increasing the tention on the spring. A carby normally has a fuel bowl that is vented to atmosphere and as the pressuer changes in the manifld the fuel is forced in by the pressure ( atmosphere 0 on the fuel in the bowl. A small valve controls the fuel level in the fuel bowl and this is not effected by pressure unless, ofcourse, the fuel pressure is to high and overcome the spring tension that operates the level valve. When the fuel pressure is to high the carby can flood