Stude4x4

Somewhere on here, someone mentioned using a boost gauge as a fuel pressure gauge. Would this work? I have an extra boost gauge and was thinking of using it for the time being. Thanks.

Mopar1973

what number of boost does the boost gauge go up to? if you have a stock lift pump you're only going to see like 4-5 psi and it may be hard to read.

carl48

any 0-15 psi gauge will work i usually get a $16 glycerin filled gauge from ww granger.

nkennedy

Depends on what the bourdon tube is made out of. It may not be fuel compatible.

j_martin

It's not a good idea to have pressurized fuel in the passenger compartment. That's's why they make electric fuel pressure gauges, and that's the only safe way to go.

Stude4x4

Thanks or the replys. Yeah I know it's not good to run a mechanical gauge in the cab, its not my first choice, but it shouldn't leak right? I'm upgrading to a high pressure piston pump and it's what I got for now. I don't have an extra 150$ for an electric gauge. The boost gauge goes to 35 psi. Thanks.

1bad93

well if you want to keep a mechanical gauge you can always use a isolstor.
jon

carl48

fuel in the cab does not hurt anything. all fuel gauges used on trucks and heavy equipment built from about 1900 to 1990 had fuel to the gauge. and some still have it today. i have 138 pieces of equipment or trucks with diesel engines and none of them with factory installed gauges are electrical. and all of our installed gauges are mechanical. i can not figure where this wives tail started

BILTIT

It is a safety concern. I don't want the chance of diesel spraying inside my truck, bad enough i have to deal with a leak outside the truck.

Saying that, i have an oil pressure gauge which has oil inside the cab (s.s. line though) in my race car so its up to you really.

Trebor

Starting back to the mid 1960's and going forward over the years I can say I have driven hundreds of thousands of miles with Dodge & GM trucks that had 16 - 18 gallon gasoline tanks located inside the cab behind the drivers seat. Some of these trucks had aftermarket mechanical oil pressure gauges that could rupture and spray hundreds of degree oil, and in some cases had mechanical gasoline fuel pressure gauges that were teed into the gasoline line just beyond the fuel pump. I guess that's why I would have no fear of a direct coupled fuel pressure gauge that is connected to a fuel line carrying diesel. In the end it's your truck and your decision as to what you use.

Busboy

X2 just use an isolator then fill the line from the isolator to the gauge with glycol.

carl48

the isolator is a pos. when the diaphragm fails you have water -antifreeze heading toward the injection pump. if for some weired reason you are afraid of diesel in the cab just use a electrical gauge.

slevhansen

You could just connect it if you are in doubt, I did that with my boostgauge because my fuelpressuregauge went nuts, took it for a short spin just to see what´s up, then put it back to the boost hose. ( after blowing it out with compressed air )

Slev

carl48

the scale on the boost gauge is to high, you want a mid scale reading. and diesel is not gas when the #4 injector line breaks on a common rail it sprays fuel under 19,000 lbs pressure on a hot engine, some get's on the manifold. no fires.