Technical Low Fuel Pressure Gauge

Since I only need 2.5# PSI why do I need a gauge that goes to 15#? I would like to buy a 1-4# or 1-5# gauge. I would prefer a good quality (not chinese) gauge, a used one would be fine.

 

I wish I could tell you they make a nice looking one but they don't as far as I know.
This is mine, 0-10 and the 2-3 is in red so easy to see what you are doing. LCE is the name on it.
If you find something that looks nice don't forget to post a pic of what you get.

 

Never seen one in those increments. I use a marshall which I think is very attractive and have a matching oil pressure gauge on my firewall.

 

Apparently Marshall make the Moon fuel pressure gauges but both gauges go up to 15 p.s.i. The one @Bandit Billy posted looks like a good option, and should be more accurate.

 

Look out side of automotive,
Pretty much all low pressure gauges that are 0-5 psi face size are 2 inch size .
& bigger , European, German , Japanese companies

 

Low pressure gauges are used on some steam heating systems, which typicaly operate around 2 psi. Here is one 0-5 psi. Search "low pressure gauge" for other options.

https://www.supplyhouse.com/Bluefin...-Gauge-Bottom-Mount-w-Brass-Internals-0-5-PSI

 

I've used the Marshall gages with success and they look nice.

 

You might check with this member to see if he still has any. He was last on line yesterday.

https://www.jalopyjournal.com/forum/threads/multi-carb-specific-fuel-pressure-gauge.1036051/

 

Honestly that looks the same as the 15lb gauge with the scale only marked until 5.

 

I reached out to that member, we’ll see what happens. Once outside automotive gauges there are definitely some 0-5 gauges available. There are also 0-10 psi gauges that are liquid filled. Liquid filled isn’t a must but it would be great if I could find a 0-5 liquid filled. Thank to y’all for the help.

 

I noticed that too Studley

 

I was told by Marshall ,
The way the gauge mechanism is design that the housing for the gauge that is roughly a 50 Cent piece diameter would be too big for low pressure sweep 180- 260 deg to fit in the housing for such low pressures, and accuracy,
This why 0-5 ,0-10 much bigger
2 inch plus gauge size

 

Check Grainger. They have a bunch of 0-5 psi offerings.

 

You might be right, it looks like it has the same amount of sweep as the 0-5 psi range on a 0-15 psi gauge.

 

I've had this same issue installing Weber Carburetors on import trucks which like 3 lbs or less of pressure. Finding a fuel regular and gauge can be a bear. I've always ended up using 2" industrial gauges and holley fuel regulators. The low pressure ebay gauges are rarely accurate and usually have a short life.

 

I’m good with using a larger gauge in order to get what I want. I suppose that in theory, once the regulator has been set then the gauge would no longer be needed but I doubt that the regulator is that precise or consistent. I would still like to find a 0-5# liquid filled gauge which may be out there but I haven’t found it yet.

 

Many complaints , & I myself have had issues with the liquid filled,
( 0-5 ) & other pressures , after hot & heat transfer pressure on gauge would go up,,,
( I would remove liquid from gauge))
Now I'm thinking I'm will have to do a test on that
""Heat transfer gauge reading higher""

I will get around ,make a Tree , calibrate and note gauge reading Cold , after calibrating 4 or so gauges,
(accuracy and note )
Then test One liquid filled and Two non, Non-filled then a
liquid filled in middle and then a
non-filled on end of tree , & see If liquid filled one if pressure rises ,,if the two on the outer ends do also,, or hold steady or go up in pressure,,

I deal with some gas applications that are very pressure sensitive, 1.5 to 2 psi ..

 

@19Eddy30 would absolutely love to see what you find out !

......

 

i will have to get a Liquid filled because all the ones I have are empty,
Up until about a 6 months ago,
(gauge about two month old at the time)
I was running a Marshall
( nothing against Marshall)
I was running a 100 spi gauge,
It was Liquid but drained, using on High fuel pressure 65psi , on open hooded car,
Was testing made pass , next thing I know liquid all over the windshield,
Strong smell gas , killed engine ,
Smell gas but could not see anything I flipped the electric fuel pump on and gas started spraying out of the gauge that made me kind of nervous , i'm glad that the air Dynamics of my car routed the fuel upward and over the roof instead of cross the headers

because I was on a mid 6 sec pass testing on the street , called my nephew at 2 AM to go to my shop and bring me pipe plugs,,,
So since then I'm using electric censored fuel pressure gauge, for many years I've ran fuel gauges and I never had one do this (name brands)

 

It may be difficult to find a 5psi fuel pressure gauge.

Here are 2 Stewart Warner 10psi that are older Made In U.S.A.
2 5/8"


https://www.ebay.com/itm/3869689210...GcO1OIySry&var=&widget_ver=artemis&media=COPY


Here is a smaller 2 1/16"

https://www.ebay.com/itm/3153637888...GcO1OIySry&var=&widget_ver=artemis&media=COPY

I understand you would prefer a smaller numbered gauge, but these are a good next best option.



Here's a 2 5/8" I had, but sold. I mounted the gauge in a chrome cup and I thought it looked pretty nice.

 

I am resigned to the fact that I will need a larger gauge than ideal and probably use a 10# gauge as well. In general, nothing “new” is worth buying but sometimes there is no other option. I like that vintage SW and would buy one if I find one.

 

Here's a Guage: https://www.mcmaster.com/4026K37-4026K151/

 

Here is a 2 1/16"


I have a gage as in above pic. Can send actual pics if you pm me a phone number.

 

Vintage Speed

 

Dicks hot rod carbs. He was a member on here & I bought one of his that works great. I had a marshal liquid filled before that & the pressure would always change by at least one psi from hot to cold. I’m told glycerin filled gauges react with heat a mine is mounted on the fuel block on my firewall.

 

McMaster Carr carries several low pressure gauges. 0-3,0-5, 0-10. They are 2 1/2" dials.

 

Dick's sales ad:
https://www.jalopyjournal.com/forum/threads/multi-carb-specific-fuel-pressure-gauge.1036051/

 

The McMaster Carr gauge (presumably the 0-5 psi similar):



The Dickster gauge:

 

You guys were all expecting something else..? What else did you expect? What's wrong with the sweep? Not a lot of confusion there, the needle in the middle of the numbers is the perfect spot OP wants a gauge to be. Not a lot of mistaking that even at a glance when the direct middle of a fairly flat sweep like that shows exactly the pressure the guy wants to see

 

When the OP is finding 0-15 gauges that are a full sweep, but wants 0-5, clearly he wants a larger sweep and better resolution of the readings. The 0-15 from dicks looks like the same 0-15 just with a reprinted face that only goes from 0-5, so it doesn't give any better resolution.