Engine/Transmission (1998.5 - 2002) Installing Fuel psi gauge

[CCamillo]

I am putting in the autometer 30 psi gauge. I bought it from Geno's with the uni adapter hose. I am wondering how some people have done the wiring. I was going to tap the light into my dimer switch. I was wondering when i hook up the sending unit how to bleed the air from the system? Any help would be appreciated. Thanks Chris

 

[RBeard]

Chris, I tapped onto the ashtray light and to bleed it I left the connection a little loose and bumped the starter to start the lift pump. Then tightened it up when all the air was out.

 

[RHARVEY]

I use those mini add a fuse and go directly into the fuse box. I use the 5 amp dash light fuse. Those add a fuse makes a real clean job. I believe autozone or one of those places carry them.



Rick

 

[WestTN]

If you are talking about the hose prior to the isolator, there is no need to bleed it. The pressure reading will have the same accuracy whether or not the line is bled. Every point in a closed system will be at the same pressure.

 

[OL RATLR]

Chris, I tapped onto the ashtray light and to bleed it I left the connection a little loose and bumped the starter to start the lift pump. Then tightened it up when all the air was out.

I tapped onto the ashtray light also.

 

[DNewell]

If you are talking about the hose prior to the isolator, there is no need to bleed it. The pressure reading will have the same accuracy whether or not the line is bled. Every point in a closed system will be at the same pressure.

I wouldn't recommend doing this. The system does need to be bled to be accurate. I've got the mechanical gauge and I have had to bleed it to ensure that I get the most accurate pressure readings.

To purge the system, I tapped into the top of the fuel filter cannister and ran the line up to the isolator. Since the isolator is sealed, you'll need to crack the bleed screw on it. Start the truck, and when fuel starts to come out the bleeder screw, you're good to go. Just ensure that the propylene glycol(not too sure if this is the proper term), antifreeze, on the other side is completely topped off.

If you have air in the lines, it will alter the reading because of the expansion and contraction of the air.

 

[WestTN]

It is absolutely unneccesary to bleed the line from the fueluilt source to the isolator. The line from the isolator, yes. In fact, the air in the first line actually serves as a buffer from pressure spikes which could actually shorten the life of the sensor. I built small air chambers into my dual sensor system just for this reason. The pressure in the first line does not vary anywhere in that line because there is no flow through it.



I have spent several years working with instruments and calibration, as well as static and flowing pressure readings,so this is real knowledge based on specific training and experience.