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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 |
I'm not so sure it's about the sealant working so much as engine vibration making the gauge work loose after time. |
Soooo, how do you get that valve out? I get it to turn about a thread and then it just spins. |
You WERE asking how to put it on; NOW you want to know how to get it off? Get your story straight please... |
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. |
Holw to get Schrader valve off now? I have the tool, and can't get it to loosen up. |
Post up some pictures. Not trying to be a dick but I think you may be confused. If you’re talking stock rails the schrader valve is part of the rail and doesn’t 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 that’s 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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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 1/8”npt on a regulator or aftermarket rails |
No theres nothing in it. The description said that the valve needed to be removed. |
Get practical. Mount the gauge somewhere else. |
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. |
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. |
Originally Posted by Formula81
(Post 20010622)
No theres nothing in it. The description said that the valve needed to be removed. |
Originally Posted by Drj8787
(Post 20010650)
as in the valvestem I assume is what they are referring to? |
Originally Posted by G Atsma
(Post 20010649)
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. |
Originally Posted by Formula81
(Post 20010658)
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. https://cimg5.ibsrv.net/gimg/ls1tech...2cceb556a2.png |
Originally Posted by Drj8787
(Post 20010663)
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 can’t hear the pump prime then it’s 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. It’s 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 it’s possible a ground wire is not making a good connection. https://cimg5.ibsrv.net/gimg/ls1tech...2cceb556a2.png |
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 |
I’m not sure about the newer stuff but it definitely does work on the older stuff |
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