C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

??? fuel pressure regulator modified LT1

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Old Jun 5, 2013 | 10:33 PM
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Default ??? fuel pressure regulator modified LT1

Background: Fitting a modified LT1 intake to my L98.
I have purchased a stock LT1 FPR and fuel lines from a Corvette salvage yard, the Forum and off eBay.
Evidently I am having difficulty explaining exactly what I need. I need the parts to plumb the FPR from the fuel intake line to one of the fuel rails. Vette2Vette did not have the part so he is unable to help.
Picture A is the FPR's inlet (right?)

Picture B is the FPR's outlet (right?)

Picture C is the inlet fuel line. How the freak does it hook up to the inlet side of the FPR. What part do I need to make this work?

Pictures D and E show what I think is the line that goes from the FPR to the fuel rail. I will have to bend it to make it fit but what part am I missing to connect them?


I do not have an LT1 FSM so it has been difficult to figure how this goes together.
I also have not been able to find good pics or diagrams of how this part of the fuel system goes together. The best pic I have is some I took of my old LT4 with the fuel rail covers off:



If someone has a diagram of how the FPR fits into the system I would really appreciate it.
I know I will have to relocate it as it sits where my small cap distributor might interfere with it.
After I get it all installed I will post pics. I am hooking up the hoses between the remote thermostat and the inlets at the rear of the manifold. I am working with Summit Racing to find me a 90 degree elbow that fits on this and ends in a 3/4" OD flare. The local auto parts stores and Ace hardware cannot find anything that will work
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Old Jun 5, 2013 | 10:58 PM
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Just so we are on the same page , you know the reg goes on the return ?
Originally Posted by corvetteronw
Picture A is the FPR's inlet (right?)
Correct , but is the inlet to the reg from the fuel rail ; not inlet from the fuel line

Originally Posted by corvetteronw
How the freak does it hook up to the inlet side of the FPR.
The fitting with the O ring slips into the drv side rail and is held in place with the shown clamp that fits around the rail
The hard line you show comes out the bottom of the reg and goes to the braided line as the return

As shown in your pics , the inlet flow is direct into the pass side rail

Last edited by vetteoz; Jun 5, 2013 at 11:03 PM.
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Old Jun 5, 2013 | 11:05 PM
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Ron, here is a video showing how to replace the FPR on an LT1/LT4
It should show you exactly how it all goes together.
After watching the video, I didn't have any issues in replacing mine.

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Old Jun 5, 2013 | 11:09 PM
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Thanks guys. I do have that piece that holds the FPR to the driver side fuel rail. Just could not figure out how it fit.
I will study the vid - really appreciate it.
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Old Jun 5, 2013 | 11:12 PM
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I also got some great help from one of the sales reps at Summit. I ordered the parts I need and will get that problem out of the way.
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Old Jun 6, 2013 | 09:59 PM
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Here is one of the projects I did today now that I know how it all fits together:
Installed this piece that holds the FPR in place. I had to knock it in a bit further with a rubber hammer so that it lined up.


Installed this portion of the return line. I have a couple of fuel friendly O ring sets but the one I used here was a bit loose into the connection at the FPR. Should I try to find the correct size? The next size up in the set was too fat.

Here you can see the fitting that came with the manifold. I am going to have a line made up so I can run it to the stock inlet at the front of the engine.

What do I have to purchase to get from the return line to this? Looks like some type of plastic piece that I don't have.

I will also run the return line to the front of the engine and mate it to the stock 91's return line.
I thought about running the lines down to the fuel filter but decided this was easier.
I am also installing an AIR pump eliminator kit, a set of underdrive pulleys and while I am in there, a new waterpump. I got this Duralast from Autozone. It is new and has a lifetime warranty:

I will be posting up all the parts I am taking off in the Parts for Sale section here when I am done.
Still having fun in the garage. Still having to work on the 2 basements in my duplex from the May flood so am not able to devote as much time to the Corvette as I would like. Dry wall is all repaired, painting has started and we are getting ready to install laminate "wood" floors and trim. I am lucky that my bride is letting me off the project for Bloomington Gold at the end of June.
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