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1990 single turbo fuel

Old 11-08-2018, 08:30 PM
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Swxxt
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Default 1990 single turbo fuel

I am in the process of making my own turbo kit, tried looking up what people running supercharged do for fuel pressure how do you regulate it? I have a boost reference FPR but then do I close the stock return line and use the return from the regulator also going to use stock fuel rails. Picture of turbo below
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Old 11-09-2018, 09:33 PM
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Pwnage1337
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Pictures of regulator you have? Are you trying to run the fuel pressure regulator before the fuel rail, sending a regulated FP to the rail?

It might be possible to machine a blockoff plate for the factory fuel pressure regulator, or maybe even leave it in place?

You will need a bigger fuel pump if you haven't got one already.
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Old 11-09-2018, 09:42 PM
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This is my very poor graphical representation of what I think you are trying to say
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Old 11-10-2018, 01:19 PM
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Originally Posted by Pwnage1337 View Post


This is my very poor graphical representation of what I think you are trying to say
yes that's exactly what I am trying to say, I am going to try this first and see how it work and also removed the stock FPR

as for the FPR I have it's a cheap ebay knock off
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Old 11-10-2018, 05:10 PM
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I'd be careful with doing that. The stock FPR is vacuum referenced (not sure how it reacts under boost?) There have been occasions where the diaphragm inside of the regulator ruptures, forcing fuel out of the vacuum reference port.

Obviously if you don't have the vacuum hose hooked up to the intake manifold, it is going to squirt gas out of that port, combined with high EGT's caused by turbos will result in instant fire.

I'm not real sure how you could circumvent this in the event that it does pop. I know the Holley FPR that I had, used a threaded nipple that could screw out and thread in a pipe plug. I still have it, could provide pictures of it if you wanted.

Jeremy
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Old 11-11-2018, 08:29 AM
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I have never tried this but I would bet that the stock regulator would work fine with boost. I would keep the vacuum line hooked up to manifold pressure and I would suspect that it would add fuel pressure on a 1 to 1 basis with the boost increase. Vacuum causes it to drop pressure and if you look at the design it should add pressure with boost.
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Old 11-12-2018, 12:41 PM
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You could try applying pressure to the FPR through some sort of hand pump maybe and see if the fuel pressure responds, and just run the stock regulator.

Listen to Brian^^. He knows whats up


Jeremy
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Old 11-13-2018, 04:27 AM
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The stock regulator is the correct type for boost. It has a Vacuum ( and boost ) reference to the plenum pressure.

If you use the other regulator ( picture? ) you don't want it to mount it like in the drawn picture. You want to circulate fuel in the fuel rails, both for cooling and to remove any air.

pump ---- filter ----- fuel rail --- fuel rail --- regulator ---- return to tank.

One option is to use a Y and run the fuel rails in parallel and join them in another Y or in the regulator.

I must say that the turbo placement was not very discrete.

Last edited by JoBy; 11-13-2018 at 04:35 AM. Reason: Adding information
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