Engine/Transmission (1994 - 1998) Dumb question...can you use a old boost gauge as a FP guage?

[Got Smoke?]

The truck I have came with Boost and EGT gauges, well it only has a puny 35psi gauge and I can peg it and then some! :-laf



Just wondering since I have to replace it anyways if it could be used a fuel pressure gauge? I want to do a permenant mount FP gauge with Geno's donut underdash mount kit anyways and this would save a little $$.

 

[tp0d]

if its rated for air or water pressure, I dunno if i`d trust it with a live fuel line to my cab. They have isolation devices to keep the fuel where its spoda be. . (though I dont have any experience w/ those)... I do believe the 12v lift pump can achieve more than 35psi at wot, but I could be wrong. .



Would I install an old boost gauge as a FP gauge? prolly not. .



good luck



-j

 

[DF5152]

it should work depending on the quality of the gauge. Like stated above not sure i would trust and older gauge on fuel but a pressure gauge is a pressure gauge

 

[Got Smoke?]

Ok I figured it wouldn't work, but you never know until you ask right fellas?

 

[Cummins4Life]

What brand is it? I ran an autometer 35psi boost gauge for 10months before I sold my 01, its still working great for the new owner after another 6 months. Fuel straight to the gauge through a stainless steel line.

 

[Joe G.]

35 PSI is not quite enough anyway. If you are doing freeway speed and lift for an exit the fuel pressure will peg a 40 PSI gauge.

 

[JaMan]

What are the guys that go under the same online name from Arizona and Oregon, anyway he had been using a Autometer boost gauge for fp for well over a year in the cab with no complaints awhile back but it was on a 24v so pressures are lower. Sorry can't remember their names this late at night.



Jared

 

[John - K5AWO]

Don't know why you should think it won't work. Diesel is an oil base and as such it is not going to corrode anything. As stated, a pressure guage is a pressure guage.



What you will find though, if it is not fluid filled, it will be susceptible to pressure fluctuations. It will probably need a way of isolating the pressure bumps from the guage. That can be done easily with a small needle valve between the lift pump and the line going to the guage.



I for one, don't worry about live fuel going into the cab. I have had mechanical guages for years and never had a problem. An occassional leak that is easily fixed by a small snugging of the fitting.



Go for it.

 

[JLEONARD]

You can always install a shut off valve ahead of the gage (in the engine compartment) to shut the fuel down if the gage develops a leak.

Jay

 

[CarlJensen]

If you put an isolater and a snubber valve on it the gauge would work but you probably need a sixty pound range so what good would it do?

 

[KLockliear]

Pressure is pressure. It will work.



HOWEVER, if it is an Autometer, they do say that if you peg the gauge, and exceed the sweep by 10% or more (3. 5psi over 35psi on a 35psi gauge), then it's junk.

 

[dpuckett]

Wow!!

i dont mean to hijack this thread, but my question/ comment is along the same lines. I have an oil pressure gauge (bargain bin special, jsut to get an idea) I bought for testing purposes when my factory gauge started reading really low. Would this work for a FP gauge as well? I am pretty sure it wouldnt hurt anything, but was wondering about accuracy. I'd think if a boost gauge would work, the oil press would, too?



Daniel

 

[Got Smoke?]

Pressure is pressure. It will work.



HOWEVER, if it is an Autometer, they do say that if you peg the gauge, and exceed the sweep by 10% or more (3. 5psi over 35psi on a 35psi gauge), then it's junk.

I have a Advance "auto parts special" oil pressure gauge also that's 0-60psi I think?



Bought it to use a temporary FP pressure tester, had forgotten about it until now. I guess that would work wouldn't it?



Above post's are right though and I didn't think about it a 35psi gauge wouldn't be enough for a 12V FP gauge, I was just thinking I need to upgrade my boost gauge "why couldn't I... ... . " sorta deals.

 

[CarlJensen]

Would probably work. The reason for isolater is to keep fuel out of cab. The reason for a snubber is to stop flucuations and this can be adjusted with a needle valve snubber.

 

[Got Smoke?]

Would probably work. The reason for isolater is to keep fuel out of cab. The reason for a snubber is to stop flucuations and this can be adjusted with a needle valve snubber.

Where would I be able to purchase the above mentioned parts?

 

[CarlJensen]

Gauge manufacturers make isolators for there products and you can get one from any of them. A snubber is nothing more than a needle valve(fuel proof brass) that can be purchased at Home Depot, most auto parts shops, model supply shops, etc. The idea is to restrict flow so fluctuations of pressure take longer to effect the gauge. Makes gauge movement smoother and is not needed if you don't mind a jumpy gauge. Just have to find one that fits the line you use.

 

[JaMan]

I don't know if W. W. Grainger is just in Texas or all over but thats where I got my snubber and also a needle valve for another project. You might check their online store?



Jared