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Hi, I would really like to know if somebody could explain me what is the function of the solenoid that is between the vacum line that conects the fuel pressure regulator with the manifold in the SUpra. Why isn't it like most of the engines that is conected directly to the manifold?? I have seen also this configuration on Mitsubishi 4g63.

Thanks for your answers
ANdres
 

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It's there to switch the reference to the fuel pressure regulator from the manifold to atmosphere during warm start conditions. That increases fuel pressure to the injectors. I believe it's there to help with vapor lock.

It often gets removed on single installs with no noticable effect.

Mike
 

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Turbo Guy
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533 Posts
Is it this?



I took mine out after reading this post when I searched for it because I too was unsure of what the solenoid did.

Here it is removed and bypassed...clean (diagram with old routing that i photoshopped)





Heres the factory diagram



Hopefully all these pictures and detailed diagrams help :biggrin:
 

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So it be removed with no ill-effects with an aftermarket fuel setup on a single turbo (just running VPC here)? Checking b'c I'll be sure to remove it now if so. One less thing to plug, and can continue cleaning the bay out of more wires.
 
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