Some off the cheaper pressure gauges do not depress that, so you will need to remove the to get the gauge to work
Injector Manifold Test Port - O-ring?
Thread Starter
Le Mans Master
Joined: May 2006
Posts: 6,774
Likes: 363
From: Midland TX
Injector Manifold Test Port - O-ring?
I have a 2001 C5.
I purchased a new Fuel Pressure Test Gauge Kit and ran a pressure test tonight for the first time. I removed the Test Port Cap from the manifold, connected the pressure gauge collar, ran the test and when I removed the test gauge collar, I saw a small red rubber O-Ring gasket fall out of the connection. Now I don't know if the gasket was part of the pressure gauge kit and hiding inside the collar, or if it came on the car and was there to help seal the opening when the metal cap when screwed back on (and was just stuck to the manifold when I took the cap off and I did not notice it)?
Any idea?
I purchased a new Fuel Pressure Test Gauge Kit and ran a pressure test tonight for the first time. I removed the Test Port Cap from the manifold, connected the pressure gauge collar, ran the test and when I removed the test gauge collar, I saw a small red rubber O-Ring gasket fall out of the connection. Now I don't know if the gasket was part of the pressure gauge kit and hiding inside the collar, or if it came on the car and was there to help seal the opening when the metal cap when screwed back on (and was just stuck to the manifold when I took the cap off and I did not notice it)?
Any idea?
Le Mans Master
Joined: Jul 2010
Posts: 6,013
Likes: 726
I have a 2001 C5.
I purchased a new Fuel Pressure Test Gauge Kit and ran a pressure test tonight for the first time. I removed the Test Port Cap from the manifold, connected the pressure gauge collar, ran the test and when I removed the test gauge collar, I saw a small red rubber O-Ring gasket fall out of the connection. Now I don't know if the gasket was part of the pressure gauge kit and hiding inside the collar, or if it came on the car and was there to help seal the opening when the metal cap when screwed back on (and was just stuck to the manifold when I took the cap off and I did not notice it)?
Any idea?
I purchased a new Fuel Pressure Test Gauge Kit and ran a pressure test tonight for the first time. I removed the Test Port Cap from the manifold, connected the pressure gauge collar, ran the test and when I removed the test gauge collar, I saw a small red rubber O-Ring gasket fall out of the connection. Now I don't know if the gasket was part of the pressure gauge kit and hiding inside the collar, or if it came on the car and was there to help seal the opening when the metal cap when screwed back on (and was just stuck to the manifold when I took the cap off and I did not notice it)?
Any idea?
Look like this
.
Joined: Apr 2013
Posts: 5,042
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From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Thread Starter
Le Mans Master
Joined: May 2006
Posts: 6,774
Likes: 363
From: Midland TX
Drifting
Joined: Sep 2009
Posts: 1,862
Likes: 594
From: Prescott, Arizona
The O ring would be part of the test kit. The fuel rail is sealed by the Schrader valve, the cap keeps dust out. When testing fuel pressure, the test kit fuel rail adaptor pushes open the Schrader valve and therefor needs it's own seal.
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