Engine/Transmission (1998.5 - 2002) Need advice on hooking up a fuel pressure guage

[EGaskamp]

I am Eric's brother and I have a 01 cummins, 4x4, 5 spd, injectors,chip,and guages, and I am trying to hook up a fuel pressure guage and I need some Advice. I have the isolator for the guage and need to know where and How It connects? Any help would be appreciated.

 

[Bloomy]

You will need a piece of fuel hose that goes from the VP44 to wherever you mount the isolator. On the driverside towards the back of the VP is a schrader valve where you can hook one end of the fuel hose. The other end hooks to the isolator. Obviously you will need the appropriate fittings to fit your isolator. Depending on what type of fitting you get for the VP side, you might have to remove the valve stem from the VP schrader valve. Then run 1/8" tubing (same as my boost tubing) filled with glycol (anti-freeze) through the firewall and to your gauge. Doug @ Advanced Diesel Technologies sells the whole setup that makes it pretty easy. I assumed that this is a permanently mounted in the cab mechanical gauge as opposed to an electric gauge. If it is electric, ignore everything except the schrader valve on the VP. Hope this wasn't to confusing.



Thomas

 

[EGaskamp]

Thanks for the information and were is the shrader valve located? Also I would like to know even with an isolater what keeps the fuel from going to the gauge and where I could get a fitting to fit the valve and what size?

 

[JBrookshire]

Just did a install.

I just hooked one one my truck and a buddys truck. I bought a hose from genos already made for that. the one end screws on the shrader valve, and the othe end goes the the isolater. on my isolater you are suppose to put antifreeze in the top part of the iso. I had mine installed in about hour to hour and a half. Any more questions ask away. Justin

 

[Nickaru]

There is a rubber diaphram in the isolator. It should be marked with which side faces the gauge. On the gauge side, you put the anti-freeze (keeps from freezing?) and the supply side is the diesel. You may have to bleed some of the air out of the diesel side. I mounted mine in the cubby hole in front of the drivers side battery. The hose is available from Geno's for the schrader valve hook up.

 

[JFinke]

The schrader valves are at the fuel line to VP connection and the LP to fuel filter connection. You want to read your pressure at the VP inlet. You can hook one up at the filter and compare it to post filter to check for filter restriction. The schrader valve will have a black plastic cover on it and is the same size as some R12 AC fittings. It just takes a tire valve stem remover to pull the guts out. Jake

 

[EGaskamp]

do you have to pull the guts out of the shrader valve in order to connent the hose? Also how and where do you put the antifreeze into the isolater?

 

[Bloomy]

The entire section of tubing from the isolator to gauge needs filled. Not sure of the best way to get it filled. Mine came pre-filled which made it real easy.



Thomas

 

[jerrethomas]

The entire section of tubing from the isolator to gauge needs filled. Not sure of the best way to get it filled. Mine came pre-filled which made it real easy.



Thomas

my directions with mine stated if the tube from the gauge to the isolater was less then 5 feet i think, you didn't need to fill the tube, just the isolater.

 

[JFinke]

You only have to pull the guts out if the hose you get does'nt have a pin in the center to depress the schrader valve. If it looks like a tire guage with the center pin it will read the pressure. I have the max flow kit, so mine has a 1/8" pipe fitting at the location where the schrader fitting used to be. Before that I had the high flow banjo's that also had 1/8" pipe fittings. Jake

 

[MKizziah]

Cheap Trick to fill the gauge side

I just put in an isolator. What I did was a vacuum fill. . Real easy



Get a 20-50 cc syringe, dont need the needle. fill up the isolator with antifreeze sit it down so the fluid is up around the threads. Then Fill the syringe with anti freeze and pump it in the hose to the gauge. you'll have to do it a couple of times (to fill the gauge) with the hose end above the gauge. I let it sit a while (hose above the gauge still) as the air will bleed out naturally. Here's the fun part. . fill the syringe half way with fluid. connect to the hose , pull the syringe out, it will suck the air out of the hose and gauge, push the fluid back into the hose. Hold the isolator up abve the gauge and connect the hose to it. You'll get a little air bubble maybe, but not enough to affect the accuracy of the gauge. .