GEN 3 LS6 not getting fuel
Thread Starter
Staging Lane
Joined: Jul 2024
Posts: 59
Likes: 3
From: San Diego
GEN 3 LS6 not getting fuel This is a continuation post from another I posted but with new issues. I swapped a 2004 Gen 3 LS6 into my 1968 Corvette. The engine will start on starting fluid but dies immediately when that is used up. I have 58psi coming through my fuel pressure gauge just before the fuel rail and I have tested the injectors with a noid light. I suspected the original injectors were bad so I replaced them with some cheap Amazon injectors just to see if it fixed the issue and it did not. I have since ordered a god set of injectors that flow at 28.8 @ 58 psi but they have not arrived yet.
After thinking about this all week I found something that it may be. I am running the Holley in tank fuel pump that I installed during my last build where I had a 383 Stroker and Holley Sniper I system. The Holley in tank fuel pump is a "returnless" system. The fuel rail I have on the car looks to be the stock fuel rail. Are there two types of fuel rails...a return style and a returnless fuel rail? AND if so, could that be the issue?
After thinking about this all week I found something that it may be. I am running the Holley in tank fuel pump that I installed during my last build where I had a 383 Stroker and Holley Sniper I system. The Holley in tank fuel pump is a "returnless" system. The fuel rail I have on the car looks to be the stock fuel rail. Are there two types of fuel rails...a return style and a returnless fuel rail? AND if so, could that be the issue?
Have you put a fuel pressure gauge on the fuel rail and seen what it's doing with the engine running? Is the fuel pressure regulator mounted before the fuel rail or after? I'd want it to be after the fuel enters the fuel rail.
Thread Starter
Staging Lane
Joined: Jul 2024
Posts: 59
Likes: 3
From: San Diego
Have you hooked up your fuel pressure gauge to the schrader valve on the fuel rail and checked for 58psi with the engine running? My guess is that it's falling off and causing the issue. You could remove the schrader valve an install a fitting that allows you to mount the fuel pressure regulator on the rail or after the fuel rail that way you make certain that 58psi is coming through the fuel rail at all times. Just my thinking here as I'm no expert in this area but this seems like the logical solution to your problem.
Here's an LS2 style fuel rail where I had installed a fuel pressure gauge on the fuel rail. The rail you have has the same and you can either move your fuel pressure regulator to be on the rail which I don't suggest you do but rather run a line from there to your FPR.
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Staging Lane
Joined: Jul 2024
Posts: 59
Likes: 3
From: San Diego
Im pretty sure I have proper pressure at the rail because it actually blew one of my injectors off at one point even with the clip and thats what made me think that this is a return style rail and my fuel system is returnless.
I don't believe there is. There's dead head fuel pressure regulators and return style fuel pressure regulators. On my 01 I have a C5 fuel filter/regulator setup which is back by the fuel tank and it's working but my plans are to do something similar to what I've described but will have a return line back to the tank. Before you even try moving the regulator get a fuel pressure gauge on the fuel rail and see if it's holding 58 PSI when running. You could have a faulty regulator.