Technical Fuel Pressure Gauges?

Bummer, I was looking for a small one to mount to the fuel block.

 

Mooneyes sell one that screws into the fuel block.

https://www.mooneyesusa.com/product-p/mpg110lf.htm

 

Does anyone make an electric fuel pressure gauge, so you don''t have a fuel line in the cabin?

 

Yes there are Electric gauges
Requires a sensor @ fuel supply with usually 2 wire plug to gauge
Then positive & a ground
Autometer & maybe other make a
Diaphragm unit , gas to diaphragm
Then from out port of diaphram
Uses no flammable liquid to Mech gauge

 

Gauges are most accurate in the center of the scale
Ideally if you’re running at 2.5-3 psi a 5 psi gauge would be best.
10 not so bad, hard to find
I settled on a 15 because of availability

 

On my banger running twin 97s, I run a Holly Mighty Mite 12-425 putting out 1.5-2.5 psi and a full sweep 10 psi gauge. I had not come across a 5 psi gauge before but there are several shown on Amazon. At the low psi requirements of the 97, you need a gauge easily read. I have to agree with CSPIDY on this one.
Warren

 

I have used several Stewart Warner electric fuel pressure gauges over the last 20+ years. Here in Southern Arizona, I used them in off-topic vehicles to keep track of impending vapor lock and electric fuel pump failures. In specific, 1962 Volvo sedan, 1971 IH pickup and a 1974 IH Scout. No failures. The most recent was the 1962 Volvo - A victim of an inattentive driver (rear ended...).

Pressure gauge:
https://www.summitracing.com/parts/sww-82333 - $76.99 - In stock

Requires the following sender:
https://www.summitracing.com/parts/sww-82504-f - $72.99 - In stock

The present off-topic vehicle (1986 Ford F150 with a ***mins 4bt diesel engine). Tried a couple of digital gauges - at the time, the Stewart Warner 8254-F sender was back ordered every where, with no predicted delivery times.

The 0-100 PSI electric gauge setup was a disaster. It did not read fuel pressures below 10 PSI.

My current electronic servo gauge unit is too "Las Vegas" looking for an on-topic ride. Serves my need to keep track of the low pressure (4 to 7 PSI) electric boost pumps. A backup pump comes in line with the flip of a toggle switch.

Russ

 

If you go Electric you want to use a sensor close to your working Psi
If I want a 2 Psi accurate reading I would not use
100 Psi sensor ,I would use 10 Psi sensor , Me when needing a accurate reading , I verified with other gauges. sensors yes you end up with 3 & 4 of the same items , Sensor grade qualities matter , Good Quality and name brands will have a spec , data sheet for working
Minimum and max.
I have talked to Marsh , Autometer & other about small silver dollar size mechanical gauges
Why they do not make in low pressure I was told to be accurate the parts would be to big for that style gauge for
max 5 psi.
All gauges are not made equal
There different between a $30 & a $150 plus , Aerospace ,Aviation ,Commercial

 

I have that one. Seems to work well and matches the oil and water temp direct gauges on the engine.

 

I ask anyone to show me any 0-5 or even 0-10 psi gauge in a small size to mount right on the fuel block. Non existent as far as I’ve searched.

 

hotrodmyk, I have that same gauge but it has failed with less than 1000 miles. I had it direct mounted on rear carb banjo bolt. Is yours a liquid filled ? How or where do you have it mounted?

 

@tarheelrodr Mine is a dry gauge, been on 10 plus years. I had a liquid filled one that did not like the hot engine compartment. It is in the fuel line before the carb.

 

@J.Ukrop
Looks like a 2 & 16th ?
The one's others are asking about
Like 1-1/4 .

 

Lanair makes waste oil fired, unit heaters...probably a burner oil pressure gauge
I use a Winters Instrument manufactured 1.5" 0-15 psi gauge....because that is what the instrument supply house had that I bought pneumatic building controls from....
Pneumatic controls use 0-30 psi on a main and 0-15 psi on branch lines so lots of small panel gauges were used
a quick search on https://www.ebay.com/itm/1265143087...bbOXooVRIzgQQZ8S8oVTd3Lw==|tkp:Bk9SR6zV6MSWZw

 

https://www.mcmaster.com/products/p...-8/for-use-with~gasoline/dial-diameter~1-1-2/

 

I have one. I'll take a picture later. Unfortunately, I cannot find them anymore... and could really use a small stockpile.

3blap.

 

****ster used to sell them, but they aren’t available anymore. He had them custom made. I don’t think there are any low range gauges on the market now.

 

@alchemy... that's what I have. Wish I had more. I'll still take a picture... because why not?! Maybe it'll motivate someone to carry that torch?!

3blap.

 

I appreciate the offer!

I got the 0-15psi Marshall installed today, and while it looks great (although I'm not sure about the placement of it here...), looks like it may not be registering the low PSI of the gravity-fed cowl tank. Let me play around with it a bit more, but perhaps dropping down to a 0-10psi may give it a better readout.

But, to anyone else wondering, the quality of the Marshall is really nice and as of right now I would recommend them. It's also small enough to run off a fuel block for sure.

 

@Tumblin Dice I didn't realise that you were using the stock A fuel tank. Your gauge will only be measuring the static head from the fuel level in the tank to the gauge. Going back over 20 years to my pump industry days I remember that 2.31 feet head of water equals 1.0psi. Now I don't think that your fuel level would be close to 2.31 feet above your gauge therefore the pressure at your gauge will be less than 1.0 psi and the gauge does not really read below that figure. Also gasoline has an SG of about 0.8 so that makes your situation even worse.

 

Here is one that screws in. I will have to look for the name. 10 psi.

 

I not positive but that looks like a Holley 0-15 psi gauge to me. I don’t think Holley ever marketed a 10 psi gauge.

 

@Tumblin' Dice Measuring gravity feed pressure!?!
@swifty laid out expected pressure for you, it's going to be extremely low.
Also, a gauge is used to confirm correct pressure and adjust. With gravity, there is just what the atmospheric and elevation supplies, no adjustment.
https://weathersend.com/impact-of-pressure-on-aviation/

 

See, I gotta take off my pants to count to 21, so this is the information that I come here for. That's really helpful, thanks!

I wanted a gauge on there just to give me a data point that I'm not exceeding 3-4psi on a full tank of gas, and also because I can't/won't do the kind of math you mentioned...

 

****'s Hot Rod Shop gauge...

3blap.

 

Dumb observation but it looks like the ****'s gauge is just a different face "resolution" but with the same functional range as a 0-15 gauge.

 

It has to be calibrated differently because you can dial in 1.75psi without issue.

3blap.

 

Ok, I bet China will be selling low pressure gauges pretty soon.