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permanent fuel pressure gauge

Old 01-09-2019, 03:57 PM
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permanent fuel pressure gauge

Hello all,
I believe I may have a weak fuel pump and want to verify my pressures before I post anything else (I admit up front my google-fu is severely weak). Anyway, I looked around on here and the web trying to find a guide or something to help me put together a permanent gauge set-up. Could anyone point me in the direction, or possibly have a link, to something that explains the assembly? Thanks for the help.
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Old 01-09-2019, 05:41 PM
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Old 01-09-2019, 06:42 PM
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Note that the LCE gauge could be installed "permanently," but only under the hood. No one will (intentionally) sell you a gauge that involves running fuel (even a tiny line like for an oil pressure gauge) into the passenger compartment.

RAD4Runner installed a "permanent" gauge under his hood. https://www.yotatech.com/forums/f199...l#post52312190 He can comment on how well his gauge has stood up to the vibration.

You COULD have a cabin-installed gauge if you used an electronic sender. Expensive.

But in the end, you don't need to be watching fuel pressure day-to-day to diagnose a fuel pump. I installed a Schraeder valve to the banjo bolt next to the fuel pressure regulator. That valve comes in the following Actron gauge kit: https://actron.com/content/professio...ure-tester-kit
Amazon Amazon
You would usually use the gauge as a garage tool, but if you really needed to watch it while driving you could attach the gauge to the windshield with masking tape for a drive. The Schraeder valve is "permanent."
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Old 01-09-2019, 10:43 PM
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In my old mustang days it was almost customary to run a "mechanical" fuel pressure gauge inside the cabin, especially with a boosted application. There was a proper way to do it though as you DO NOT want to run gasoline anywhere into the cabin. The system we would use was a combination of 2 lines (braided line) a damper and gauge. The end of first line (braided line) was attached to the fuel outlet and the other end to the damper.That line had gasoline in it. From the damper another line (braided line) was attached which fed the gauge. This line was filled with antifreeze and was sometimes a bear to bleed. Any part of the arrangement that had gasoline in it stayed in the engine compartment and the other part which was filled with antifreeze was safe for inside the cabin. The main point of failure in this type of system was the damper.

As RAD mentioned, an electrical gauge setup is always an option too.

Last edited by Andy A; 01-10-2019 at 06:04 AM.
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Old 01-09-2019, 10:48 PM
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I'd really like to have an electrical sender and dash display to readily see FP when the intermittent rough idle on warm start happens, but no time to do it.

Originally Posted by scope103 View Post
...RAD4Runner installed a "permanent" gauge under his hood. https://www.yotatech.com/forums/f199...l#post52312190 He can comment on how well his gauge has stood up to the vibration....
Had been working really well for almost 3 years already. Nice way to eliminate doubt on fuel system.

I used Valley Instruments, glycerin-filled (damping) # 53721 for $17 and fittings from LCE.
https://www.northerntool.com/shop/to...isSearch=53721



Here it is at work:

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Old 01-10-2019, 07:14 PM
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Old 01-13-2019, 08:01 AM
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Thank you all for the input, I should of clarified up front that I did not intend to run a wet line into the cab. I was looking for a setup identical to or close to the one Rad4runner posted. I will admit the Schrader valve is also a good idea, however I am looking to "set and forget" in a manner of speaking. Thank you again.

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Old 01-13-2019, 10:36 AM
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Originally Posted by 91-94yota View Post
... a setup identical to or close to the one Rad4runner posted...
Wallytoo and I have similar setup.
An example of the benefit of a fixed pressure gage:
A couple of days ago, I had the intermittent low-rough idle upon warm start after a 15-minute grocery run. Popped hood.
Fuel pressure low. Disconnected FPR vacuum line to VSV to expose FPR to atmosphere, pressure increased, idle went back to normal (like in video above), reconnected and idle went low again, but as usual, after a few seconds it normalizes.
Sidenote:
I'm pretty sure that issue is because of the temp setting of the ECU temp sender (nxt to CSI switch, IIRC) which sits at a fine line. Doesn't bother much, though.

Last edited by RAD4Runner; 01-13-2019 at 10:38 AM.
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Old 01-13-2019, 11:38 AM
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The LCE kit comes with a threaded plug and claims that the gauge not be permanently mounted. The links above are the way to go unless you want that elbow in the LCE kit so the gauge faces forward.
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Old 01-13-2019, 12:12 PM
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Originally Posted by Paul22RE View Post
...claims that the gauge not be permanently mounted...
Makes sense because un-dampened (not liquid-filled) gage has been known to fail. Gages are being used under more extreme conditions. It's a matter of finding the good ones like what Wallytoo and I did. I think we got parts from same places, too.
One picture above tells OP exactly what to get and where.

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Old 01-13-2019, 12:28 PM
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Originally Posted by RAD4Runner View Post
Makes sense because un-dampened (not liquid-filled) gage has been known to fail. Gages are being used under more extreme conditions. It's a matte of finding the good ones like what Wallytoo and I did.
One picture above tell OP exactly what to get and where.
And LCE wants $35 more for a liquid filled gauge making total cost $90. The Northern Tools gauge is only $17 plus $10 banjo adapter & a $5 elbow is a mere $32 for same setup.

Last edited by Paul22RE; 01-13-2019 at 12:51 PM.
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Old 01-13-2019, 03:27 PM
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Bought this one to replace the Mr Gasket one for my Weber
Hey Ray, don't be holding out on these great items
https://www.northerntool.com/shop/to..._120056_120056

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Old 01-13-2019, 04:29 PM
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Originally Posted by NYHumpinUtah View Post
...
Hey Ray, don't be holding out ...
Already got one in 2016, Mike. LOL!
Just sharing info with O.P.
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Old 01-15-2019, 09:26 AM
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gauge

Ok, my earlier reply didn't post, and I didn't realize it until now. I should of stated up front that I had no intention of running a wet line into the cab, I wanted a gauge in the engine compartment for troubleshooting use only. I wanted one that I could permanently mount with a "set it and forget it" take on the matter. As in I could have it reading anytime I needed to diagnose without having to install and remove it every time. Rad had the exact idea I was going for with the information and picture I needed as I work better with pictures than words. Scope, the Schrader valve is good but not quite what I was looking for however, I will keep the idea on the shelf for any other applicable use. Thank you all again for the assistance.

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Old 01-15-2019, 02:05 PM
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you did reply, but you set your text color to match the background, thus nobody could "see" it. use your cursor to highlight the "blank" reply and you'll see your response IS there.
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Old 01-15-2019, 02:08 PM
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Originally Posted by wallytoo View Post
you did reply, but you set your text color to match the background, thus nobody could "see" it.
LOL!
How's your gage working, Wallytoo?
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Old 01-15-2019, 02:54 PM
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Originally Posted by wallytoo View Post
you did reply, but you set your text color to match the background, thus nobody could "see" it. use your cursor to highlight the "blank" reply and you'll see your response IS there.
LOL
wallytoo, how did you figure that one out.....funny
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Old 01-15-2019, 02:59 PM
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Originally Posted by RAD4Runner View Post
LOL!
How's your gage working, Wallytoo?
my liquid gauge failed after about two years, leaking glycerin around the face. i replaced it with a smaller US-made gauge that i thought was liquid-filled, but when it arrived, it clearly wasn't. installed it anyway, and (knock on wood) it is still working after about 18 months; which incidentally is about 17-1/2 months longer than either of the LCE gauges that i used before installing the northern tool glycerin one.

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Old 01-15-2019, 04:07 PM
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Originally Posted by wallytoo View Post
my liquid gauge failed after about two years, l... but when it arrived, it clearly wasn't....
AAH... Your gages and fuel pumps... you're cursed in that department - LOL!
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