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Gee, given your overall knowledge of Volvos, Will, it might be folly to disagree with you, but I think the turbo fuel pump might just be a higher pressure and flow pump. Here is why: it is fighting against higher pressure in the intake manifold of the turbo cars, at least when there is significant boost. And, the higher density of the air charge being shoved into the cylinders, when under boost, would necessitate a correspondingly greater quantity of fuel to maintain the 14.7:1 air:fuel ratio that is ideal.
If my reasoning is correct, then it might not be possible to use a turbo pump on a normally aspirated car. But that would depend on what the specifications of the fuel pressure regulator are, and the capacity of the return line on the N/A car. If the regulator is the same, which it might be, and the return line has the capacity to shunt the excess fuel and pressure back to the tank, then you probably could use a turbo fuel pump on a N/A car. If the return line is too small, or for some other reason can't shunt the excess pressure back to the tank, then the car will be trying to operate with too much pressure in the fuel rail and will probably run rich. Perhaps so rich that it may not run at all, or very, very poorly.
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Scott Cook - 1991 745T, 1985 RX-7 GSL-SE, 1986 Toyota Tercel (Don't laugh, it is reliable, faithful AND gets 41 mpg!)
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