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Vacuum ports

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Old Sep 8, 2024 | 01:32 PM
  #1  
mcb55-210's Avatar
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Vacuum ports

Quick question... Since I am not using the HVAC port on the rear of the intake, can I move the fuel pressure regulator hose to this port and cap the one currently used for the fuel pressure regulator? I will have to switch the fittings around due to different hose size, of course.

Thanks!

Mike
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Old Sep 9, 2024 | 06:13 PM
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aliceempire's Avatar
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Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: Vacuum ports

I mean, manifold vacuum is manifold vacuum. It's all the same unless it's ported vacuum and that would be at the throttle body. I'm not sure why you'd want to use a different port for the pressure regulator, unless there's something I'm missing in your question.
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Old Sep 9, 2024 | 07:04 PM
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Re: Vacuum ports

Originally Posted by aliceempire
I mean, manifold vacuum is manifold vacuum. It's all the same unless it's ported vacuum and that would be at the throttle body. I'm not sure why you'd want to use a different port for the pressure regulator, unless there's something I'm missing in your question.
I guess I should have added more information. First of all, I wasn't sure if there was anything internal that would cause an issue with switching it around. I am working out some issues with the engine bogging intermittently, and there aren't any error codes. I bought a fuel pressure gauge and a 90° fitting that I installed so I can watch for possible pressure variation, but I could not hook up the vacuum line as there is not enough clearance for the nipple to be installed once I installed the gauge. It would be so easy to just move the nipple over to the HVAC position. I searched for quite a while to see if I could answer my own question as I don't recall the internals of the manifold.

The gauge will be a temporary thing and will be removed once I can verify I don't have pressure fluctuation. If necessary, I can move the vacuum line back to the stock location.

Mike
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Old Sep 9, 2024 | 07:52 PM
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aliceempire's Avatar
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Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: Vacuum ports

It's all the same vaccum signal. You're good to do your plan
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