1/4 inch airbrake line for fuel pressure gauge

[catnhat]

I had a 1/4 inch Line on my old 98 and on this 01 I have 1/8ich line and in my experience the 1/4 inch was was easier to get the gauge not to bounce.

[dripley]

I use a needle valve on my 1/8" line and have had no needle bounce in the 6 or so years it has been in the truck. When @Dieselfuture mentioned a "Niddle" valve I had to re read it. Just thought he miss spelled "needle". Then what do I see but a picture of a Niddle valve. So I have learned something today.

[notlimah]

I can't remember where but I thought I remember reading that the smaller gauge line to the fuel pressure gauge is less likely to decrease overall fuel pressure in that system while still giving accurate pressure readings.

[joecool911]

Too much time on our hands...go with 1/8" and use a needle valve from napa to adjust down to where the gauge doesn't flutter. Every once in a while I gotta go under the hood and open and close the valve. Maybe gets a piece of debris in it? But the needle valve is barely open. Also the valve gives you the option to shut off the line going to the cab, in the event of a line failure. I consider it to be necessary to have the valve in place.

2 hours ago, notlimah said:

I can't remember where but I thought I remember reading that the smaller gauge line to the fuel pressure gauge is less likely to decrease overall fuel pressure in that system while still giving accurate pressure readings.

 

It's all relative. Use a mechanical pressure gauge to verify pressure from the gauge in the truck. I put a tee for my test gauge. The hose is long enough to go to the cab or under the truck to adjust pressure on pump. Got the gauge from Vulcan.

[notlimah]

I have the same gauge as well. I still haven't set up a dedicated place to plum in the test gauge though. I need to figure that out one of these days! 

[oldbeek]

The main reason i use 1/4 inch air brake line is because it meets air brake standards. It will go a million miles and 20 years in heavy truck application. The only thing that will hurt it is welding spatter or drips from cutting. I have seen it wear through aluminum without harm to the tubing.  How many times have you seen auto parts 1/8 become brittle and break or kink. Make an orffice fitting for pulsation. solder inside of fitting and drill # 50 hole.

[KATOOM]

Hey.....I just want to make it clear that I really dont care which one anyone uses.  You'll get no fight from me other than just making sure everyone knows the facts when they do decide to make a choice.