Engine/Transmission (1998.5 - 2002) Educate The Ignorant !

[DRR-24V]

I read most of the fuel pressure posts (48 pages) and wonder why we used to use a plastic or copper line to read 45 lbs of oil pressure with no problems, yet need a braided steel hose for 15-16 lbs of fuel pressure for the gauge. I can not understand why you couldn't run a nylon line straight from the fuel filter to the guage inside the cab without problems. I have never had an oil pressure line leak into the cab.

 

[tgbol]

YOU CAN!!! I agree with you. That's what I have. I used to work on an old International with a Cummins 225 in it. It had 1/4 plastic lines into the cab for a hand operated fuel pump for cold start. It had glow plug in the manifold and the fuel was sprayed on it to create hot air in the manifold.

 

[Gary - K7GLD]

I've asked the same question - for all the same reasons!



I think it's more of a "fad" thing than anything - you know - sorta like bashing the 24 valve engines - and their owners along WITH them...

 

[Bigsaint]

The oil pressure gauge in our truck uses a electric sender, no? Or did you mean with other vehicles Don ? Not flaming you brother and, in fact, I agree. I'd have no problem with running a mechanical gauge into the cab with nylon line, as long as it was protected where you entered the firewall. I choose the braided line on my gauge just because I liked the way it looks and thought it made fore a neater install. Still, I have to confess that I would probably keep the braided line for my gauge, if I moved it into the cab ( it's mounted on the hood), for a little added insurance. It's easy enough to work with and I don't have the concern of a compression fitting failure, as you might with the nylon hose.



Gary, I'm voting you for 24V president



Scott W.

 

[Gary - K7GLD]

"Gary, I'm voting you for 24V president "

 

[emarsh]

Some people do not feel comfortable with fuel under pressure routed into the cab. I would not object to diesel at this pressure, but the mindset is oriented to gasolene installations, and they carry over the same mindset, I guess.

 

[DRR-24V]

BigSaint

What I meant to say is why wouldn't a boost gauge show the proper pressure hooked to the fuel filter and not need a sender? I am probably all wrong, just want to know why.

 

[Bigsaint]

Sorry Don, guess I mis-read your post. You are absolutely correct, a boost gauge will work just fine when hooked up the FF for use a FP gauge. The gauge I'm using now is the Autometer Ultra lite vac/boost gauge. I didn't choose this for it's vac. capabilities, rather for the fact that it reads 0-20 psi's boost, which is right where I want to be in regards to pre-filter FP. I was able to keep the braided line that I had already connected to the FF as a source, using a -4AN to 1/8" NPT adapter. Can't see why the nylon hose and compression fittings wouldn't work just as well.



This wasn't my idea, another member reccommended the boost gauge as another alternative when I was looking for a replacement fro the mech. 0-15 FP gauge.



Scott W.

 

[Silver_Ram]

I don't want fuel of any sort entering my cab, but I really want to put a fuel pressure gauge in my truck.



I have tried reading past threads, but I become more confused. This works here and the same thing doesn't work there. I have always preferred the use of mechanical gauges, due to their accuracy. In my previous vehicles I have used only Autometer gauges. But I want to install a gauge that will work with my now stock truck and future truck BOMBING, or am I wishing too much.



I haven't used plastic or nylon tubing since I had two different lines rupture and coat the under side of my hood with oil. (note: Bad tubing, not bad install. )



A few years ago, when you installed a mechanical pressure gauge, such as oil pressure, the directions specified that you needed to make 2 or 3 small coils in the line. Supposedly this cut down the amount of fluid returning to the engine and/or air in the gauge. I am not quite sure which.

 

[Peter Campbell]

The coils would most likely trap a small amount of air. A free guage" snubber" to dampen the rapid fluctuations.

 

[DRR-24V]

Reasons For The Question !

It just seems like a lot of guy's have had trouble with the sending units. (inaccurate, etc) I would rather have a mechanical gauge. Most of the F/P gauges I have seen only go to 15 lbs and I would like a little more. The 0-30 boost gauges are common and I prefer it. Come to think about it, I would be uncomfortable with a nylon line in that hot engine compartment. I wonder if the vibration would tend to crack a copper line? I can't imagine how hard it will be to snake a braided line alongside my dash to reach my Pod but I guess I will find out. The electric sender unit would be a snap.

 

[Silver_Ram]

What is a gauge snubber?



Saw the term posted a couple of times, but I am in the dark.

 

[Gary - K7GLD]

"A few years ago, when you installed a mechanical pressure gauge, such as oil pressure, the directions specified that you needed to make 2 or 3 small coils in the line. Supposedly this cut down the amount of fluid returning to the engine and/or air in the gauge. I am not quite sure which. "





That was done to provide adequate protection against vibration and similar motion that over time, would cause a fatigue-type fracture in the tubing - the same is still done when needed in brake lines...

 

[Rob Thomas]

DDR-24V,



I'm using a 0-30# mechanical fuel pressure gauge, it's a SW from... . www.xks.com actually I have 2, a pre and post filter, I like them alot, very acurate.



Later, Rob

 

[JTroiano]

I just got an Isspro 0-30 psi mechanical gauge and didn't want to spend the extra money for an isolater. When I went to Napa they actually had a copper line with the ends soldered on. I felt a lot safer about using this but then after installing it I was worried that the engine vibration and it rocking back and forth in the mount would cause the line to break in time. So I got the grease gun hose and ran that from the pump to the brake master cyl. bracket and then attached the copper tube there so it never moves. I feel much better. Now I have to get the pusher pump hooked up. Can suck the fuel pressure down to zero when hot rodding.

Jon T

 

[BK]

for those looking for 0-30 psi gauges. .

you dont need to go mechanical to get one.



Geno's has, instock, Westech 0-30psi fuel pressure gauges. same price as the 0-15psi units. Senders are unique to the 30psi gauge.

 

[JTroiano]

Sorry, but they are ugly I like the Isspro one better.

Jon T

 

[BK]

Jon, you dont have to appology,

to each his own and to each his/her own proriety list...



what ever turns your crank!

 

[nickleinonen]

i remember reading somewhere here [before i became a member] about that dipricol FP gauge that went from 0-30. it looked nice. . has it lost the interest of people, or is it not out yet?

 

[WestTN]

two or three coils...

The tubing was coiled to provide movement de-coupling, avoiding bending the tube constantly at the attachment point until it broke. In other words, a strain relief.