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Fuel pressure gauge install ls1 rails

Old 11-30-2018, 10:29 PM
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Default Fuel pressure gauge install ls1 rails

So I bought a fuel pressure gauge to put on the ls1 fuel rail so I could see what I have for pressure, obviously. Now my question is, could I leave it on there if I put a thread sealant on it? I've searched and came across some old threads where people have said to not leave on due to leaking, but I'm not sure if they were using the thread seal tape or something like a permatex thread sealer. Any new opinions? Thanks
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Old 11-30-2018, 11:58 PM
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I'm not so sure it's about the sealant working so much as engine vibration making the gauge work loose after time.
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Old 12-02-2018, 12:52 AM
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Soooo, how do you get that valve out? I get it to turn about a thread and then it just spins.
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Old 12-02-2018, 01:09 AM
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You WERE asking how to put it on; NOW you want to know how to get it off? Get your story straight please...
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Old 12-02-2018, 01:18 AM
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No, sorry question was if I could leave the gauge on there after putting sealant on it, I didnt take the valve off yet because i was wondering what to do. Now i go to take the valve out and it won't come out.
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Old 12-02-2018, 01:57 AM
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Holw to get Schrader valve off now? I have the tool, and can't get it to loosen up.
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Old 12-02-2018, 10:32 AM
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Post up some pictures. Not trying to be a dick but I think you may be confused. If youíre talking stock rails the schrader valve is part of the rail and doesnít come off. If you have a proper test gauge then it should have a line coming off the gauge that screws onto the test port (Schaefer valve) if you just have a gauge sorry to tell you thatís for hooking up on a after market rail or fuel pressure regulator. Post a couple pictures of what you have to work with and where you are trying to hook it up

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Old 12-02-2018, 09:16 PM
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This is what i have
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Old 12-02-2018, 10:18 PM
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Does the silver coupling have something in it that will depress the valvestem in the schrader valve. That looks like a gauge that you would screw into a 1/8Ēnpt on a regulator or aftermarket rails
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Old 12-02-2018, 10:30 PM
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No theres nothing in it. The description said that the valve needed to be removed.
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Old 12-02-2018, 10:37 PM
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Get practical. Mount the gauge somewhere else.
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Old 12-02-2018, 10:53 PM
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Why mount it somewhere else? Basically I wanted this just to see what the pressure is at, car is not starting. I could take it back off after verifying what it is at, but if it is ok to leave on the. I'd just leave it.
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Old 12-02-2018, 11:00 PM
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Do something temporary. An underhood gauge is only good for when the hood is up. When you really need it is when you are, so in the interior is where you need it. Obviously you can't put it on the OEM rail. So put a TEE in the line somewhere to mount one temporarily until you get the issue solved. You never mentioned the no-start issue before your last post.
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Old 12-02-2018, 11:02 PM
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Originally Posted by Formula81 View Post
No theres nothing in it. The description said that the valve needed to be removed.
as in the valvestem I assume is what they are referring to? Whatís the vehicle? Has anything been done lately? As in was it running then you did some work and itís not starting now. Good chance that if itís older and nothing has been Changed recently as in ďit started this morning went to work and it wouldnít start after workĒ the pump likely finally gave up or the fuel filter is clogged up big time. If you have recently worked on it and it ran before the work was performed then check all the grounds.

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Old 12-02-2018, 11:08 PM
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Originally Posted by Drj8787 View Post

as in the valvestem I assume is what they are referring to?
that's what I was thinking
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Old 12-02-2018, 11:12 PM
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Originally Posted by G Atsma View Post
Do something temporary. An underhood gauge is only good for when the hood is up. When you really need it is when you are, so in the interior is where you need it. Obviously you can't put it on the OEM rail. So put a TEE in the line somewhere to mount one temporarily until you get the issue solved. You never mentioned the no-start issue before your last post.
yeah the car was running and decided to not start one day, so I figured I could just put this on and check pressure to make sure that's not the issue.
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Old 12-02-2018, 11:24 PM
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Originally Posted by Formula81 View Post
yeah the car was running and decided to not start one day, so I figured I could just put this on and check pressure to make sure that's not the issue.
k can you hear the pump priming when you cycle the key on? If not check fuses first. If all fuses are good and you canít hear the pump prime then itís going to be the pump or possibly a short in the harness to the pump. If you have a HF near you go pick up a fuel injection pressure test kit. Itís like 20bucks this screws right on to the test port no fuss or messing around. If you have decent fuel pressure after checking it and while cranking and you smell fuel itís possible a ground wire is not making a good connection.

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Old 12-02-2018, 11:32 PM
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Originally Posted by Drj8787 View Post

k can you hear the pump priming when you cycle the key on? If not check fuses first. If all fuses are good and you canít hear the pump prime then itís going to be the pump or possibly a short in the harness to the pump. If you have a HF near you go pick up a fuel injection pressure test kit. Itís like 20bucks this screws right on to the test port no fuss or messing around. If you have decent fuel pressure after checking it and while cranking and you smell fuel itís possible a ground wire is not making a good connection.

the pump does turn on. I looked at that test kit because it was cheap but I I thought it said it didnt work on GM vehicles.
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Old 12-03-2018, 05:06 AM
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That exact Harbor Freight kit works on my 1999 LM7 LS engine from a GMC Silverado. No complaints and I don't use any of those adapters.

Rick
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Old 12-03-2018, 05:46 AM
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Iím not sure about the newer stuff but it definitely does work on the older stuff
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