Another S/C'd member worried about his AFR - Toyota Yaris Forums

jkuchta · 03-24-2009, 11:15 PM

Adding a little more pressure to the injectors shouldn't be a problem, and would be a good way to add a little more fuel.

The problem is the pump itself and the type of fuel system we have.

The fuel system is a returnless system...which means that fuel pressure changes are brought about by speeding up or slowing down the pump. To add a boost-referanced regulator you'd need to not only boost the pump pressure up over what the max fuel pressure would be, but you would also need to add a fuel return line back to the tank.

This is not impossible, but is a little work.

What someone ought to do is referance the pump voltage to the boost pressure. If it's not too taxing on the pump, that solution might circumvent the need for a return line. I have no idea what the ECU would have to say about that though.

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03-24-2009, 11:15 PM	#10
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	Adding a little more pressure to the injectors shouldn't be a problem, and would be a good way to add a little more fuel. The problem is the pump itself and the type of fuel system we have. The fuel system is a returnless system...which means that fuel pressure changes are brought about by speeding up or slowing down the pump. To add a boost-referanced regulator you'd need to not only boost the pump pressure up over what the max fuel pressure would be, but you would also need to add a fuel return line back to the tank. This is not impossible, but is a little work. What someone ought to do is referance the pump voltage to the boost pressure. If it's not too taxing on the pump, that solution might circumvent the need for a return line. I have no idea what the ECU would have to say about that though.