permanent pressure gauge

[mikie]

I want to install a permanent fuel pressure gauge but I cant find the right thread adapter to attach my gauge to the fuel rail. Anyone know what threads are on the current schrader valve. 88 ranger 2.9

 

[IIBRONCOS]

I am also awaiting the answer..

 

[Paulos]

From what I could find, a standard Schrader valve thread is 0.305-32. you can find a tap and die here on eBay, or just the tap.

 

[dirtymike]

Why do you need a fuel gauge in the dash

 

[RonD]

Look at truck tire extension air valves

Google: tire extension valve rubber

Semi-truck tires run 60-110psi so they can handle the pressure


If you are looking for a permanent pressure gauge I would go electric, make an adapter for sensor hook up at fuel filter then run a wire into the cab for the gauge.
Having the actual 30-70psi fuel(gasoline) pressure INSIDE THE CAB for long periods just doesn't seem like a good idea to me

And tapping fuel pressure at the test valve for longer periods also seems like a bad idea, even a small leak could lead to a very very bad result

Viking Funeral..............on the highway, be fun to watch, but not from the inside

 

[bobbywalter]

https://lmr.com/item/LRS-3280/Mechanical-Fuel-Pressure-Gauge-Adaptor


i use that one.


this page should have all kinds of crap...

https://www.ebay.com/bhp/1-16-npt


the 1/16x 1/8 npt nipple and 1/8 street tee with a 1/8 x 1/16 bushing to put the schrader back and the other for the gauge....



like mentioned use an electrical sender....or the nice vdo gauge that just stays on the rail or a shunt.

 

[mikie]

Done. I used a 1/16 pipe (NPT) to 1/8 pipe (NPT) adapter. Fuel gauge screwed right in, works great no leaks. Where in my post did someone confuse the spelling of "fuel rail" with "dash"?

 

[RonD]

The word "permanent" would read like an "in the cab" gauge, otherwise what would be the point

Having a full time pressure gauge under the hood can only be observed when hood is open, and once you have read that pressure there is no benefit to reading it again unless there is an engine problem.
If there was an engine problem then you use the gauge until problem is solved then remove it.

Watching fuel pressure under load(driving) would be the only reason to add a "permanent" pressure gauge as far as I can see


Like an oil pressure gauge, doesn't do much good unless there is some way to monitor it while driving, can be a gauge, or an idiot light in that case, but an oil pressure gauge only under the hood wouldn't really be helpful except during first starts or problems

 

[bobbywalter]

ron.


this is an extremely rare case of disagree.

your merits are great, but oil and fuel psi......(which most new cars is displayed on your phone or scanner a boon of can-bus for sure)......on older rigs is priceless for tuning and trouble shooting. i can determine a volume test is necessary or an fpr is sticky by watching my vdo's fluctuations and shit like that.

..oil pressure surge and fall off is another.


a direct mechanical gauge will read far more accurate then the standard electrics... knew one of my blocks was cracked and got it out of service before i broke another 302 in half before a long trip.

 

[RonD]

I agree, but don't see the need of a permanent fuel pressure gauge in the engine bay on a street used vehicle, its something you use when there is a problem to test pressure then remove it.

I personally don't think good mechanical oil pressure gauges work any better than good electric oil pressure gauges.
Yes, electrical have do have more "parts" that can fail, and in that respect mechanical would be more reliable long term.
But running a pressurize line into the cab can also have its drawbacks, lol, with oil its just messy, with gasoline at 30-60psi pressure it can be down right dangerous

 

[bobbywalter]

i was referring to a short solid temporary gauge for oil pressure..


the typical electric gauges vary greatly with wiring and ground conditions and temperature...winter time especially if salt water gets involved which has seperate issues...

you really have to wire them solidly. but for the most part they are way more then good enough. with whats on my vehicle now if you pulled power off the block it would variate with brake lights or blinkers...i have a new system sitting...some day it will find its way in that pos...

of course the electric gauges can be much better then the particular mechanical gauge i refer to, you will pay some serious coin for it as well...and like i said, it is only as good as its installation. but super fine digital definitely wins.





fuel pressure is always nice. newer vehicles are all wired for it...electrically of course...

my systems are gauged for delta....of course i run an array of fuels and have unique fuel issues...and with a diesel it is prudent because your one trip to the pump away from having a gel blob....but even with a good ol gasoline 302 it was nice to have. you can see when its filter time.

 

[mikie]

The key words in the above posts are "when you have a problem". The truck is 30 years old and I WILL have a problem and it more than likely wont be in an auto parts store parking lot.

 

[dirtymike]

God speed