If you install a needle valve at the head of the line and run it barely cracked open any leak will be nothing more than a slow drip. It takes a very small path for the gauge since there is no flow, just a change in pressure.
The barely opened valve will also dampen any pulsations and buzzing.

 

Bill, what size and type of of line do you use - regular 1/8" line, or 1/4" braided S.S.? I would think 1/8" line would give a quicker and better measurement but I havent been able to find any S.S. or hydraulic line in 1/8".

 

Dr, I use 1/8" plastic boost tubing and push it though an outer protective sheath of 1/4" tubing to prevent chafing, cuts and kinks.
SS looks nice but is an overkill and hard to work with.
My Cat D7 even uses 1/8" plastic line for the fp gauge, think it does a lot more shaken' than a Dodge!
Never a leak on my own rigs for over seven years. Done dozens like this for others without one complaint.
When using plastic tubing with compression type fittings the most common cause of leaks is from overtightening the compression nut. Finger tight plus one turn with a wrench is plenty.

 

Thank you sir....great advice as always. I have access to 1/8" and 1/4" teflon tubing at work so I think I just saved some money...just have to make sure its rated for diesel (preety sure it will be fine)

 

For gage action it does not matter how large the line is. On air it would, but no with hydraulics, unless you can figure how to compress diesel fuel. That is why you get the rattle, it is direct from the injection pump.

Someone needs to experiment with orface size, I may do that. Figure the right size, which would be very small and then just fill the fitting with brass and run a small drill through it, would do the same thing.

Evil, if that is brake line it is rated for fuel, or oil, or air, whatever. Used that stuff all over the big trucks. Only reason I used the stainless is because it came with the gage.

 

Most excellent....Dr. Evil is happy. Im looking at a 98 12V tomorrow - so I may not even have to bother with the FP guage.

Thanks fellas.

 

I put in a mechanical guage that I can see from the drivers seat but it is outside, so no worries about leaking in the cab. I just ran the braided line through a ring I mounted under the hood, and it sits just behind the hood under the windsheild wiper. just make sure to leave enough extra hose so it doesnt pull when you open the hood. I can see it while I drive and it doesn't interfear with anything.

 

Using the needle valve gives you a fully adjustable orifice to prevent the buzzing.

 

Like an old GTO - cool.

 

If you've ever seen the fp gauge adaptor TST sells that screws into the bleed screw location it will give you an idea how small the orifice needs to be.
It's just a bit larger than a human hair. Don't know about others but I'd have trouble drilling a hole that small. Have a feeling it's done with a laser.

 

Thought my expirience yesterday might be of interest, since discussing how big of an orifice is required.
See here... https://www.dieseltruckresource.com/...threadid=55488

RJ

 

I use 1/8 plastic air line with compression fittings,no isolator,dash mounted gauge,screwed the other end on the test port of the injection pump,no sound,steady as a rock. 2001.5 Cummins 4WD,Quad,sb, auto, DSS Steering Bracket, Solidsteels new Track-bar bracket with 2003 track-bar, Espar,solinoid operated high idle, oil pressure switch to cut out intake heaters,sound deadening under hood and in cab(lead sheeting), running fanless Oct. to May. mod to make fog lites stay on with brite or dims, replaced the 9004s bulbs with 9007s,made a world of difference.

 

The needle on my ISSPRO EV started bouncing some a week or so ago. A couple of days ago, it started to "rattle". Really loud. Is this caused by the colder weather or a bad gage or ????

It's attached to the filter housing on the post filter side with a needle valve. Very similar to Shovelheads.

 

Did you try closing off you needle valve more? Had to do this on mine...almost fullt shut off.

RJ

 

COOOOOL idea.

I am looking at putting a couple of gauges outboard on my SHAKER hood!
Some folks were saying that condensation and weather will kill the guages.
So far the one that is out there for testing has no moisture on the glass, has seen -34 to plus 85 and works fine.

Glad to see someone else is doing something like this.