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Get a new mate. Seriously.

When a car runs lean, it means more air, less fuel. What he said to you contradicts itself.

If I'm not mistaken (and hopefully someone can correct me if I'm wrong), the fuel pump will deliver x amount of fuel and your engine will consume y amount of fuel. Anything that doesn't get consumed, is returned back to the tank.

The car will run rich if you drop in larger injectors (provided it runs well enough at all) without a tune. In that case, it will consume more fuel than required.

Long story short, an adjustable fuel pressure reg isn't required if you're running the right size injectors and fuel pump.

Edited by turbodragon

There is one aspect of putting a big pump in that can make the engnie run rich. If it was previously tuned with a pump that was not able to keep up, such that rail pressure was dropping at high loads then the bigger pump will maintain higher rail pressure and the same injector duty cycle will dump in more fuel. Could be a little extra, could be a lot, depending on how bad the situation was before.

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