Fuel Pressure Gauge Installation
I had been having a tough time tracking down a stumble on acceleration problem that started after the Z went through some more water than it should have. As part of this diagnostic, I installed this fuel pressure gauge to monitor what pressure the injectors were seeing.
The installation was quite easy. I tapped into the line between the fuel filter and the rail. I used a brass T with the T'd side going to the gauge, in order to not cause a pressure drop forcing the fuel flow to redirect.
In order to prevent any problems with vibration rubbing away at the fuel line that runs under the cruise control unit to the gauge, I wrapped it in split loom tubing secured with zip ties. The gauge comes with a -4 AN fitting on it. This is quite a pain to find fittings for, but I got an adapter to take that to 1/4" barbed fitting at a big auto supply warehouse down by the train tracks ('no retail sales' signs, etc.). I am not sure of any chain stores that stock this type of fitting locally, so you may be better off ordering one from Summit Racing or another large distribution warehouse. The other parts are a 5/16" brass barbed T, NAPA Fuel Injection clamps and 5/16" high pressure injection hose.
I needed a bracket to mount the gauge under the hood. I chose to put it in front of the battery, next to the cruise control actuator unit. For the bracket, I simply used a piece of 1/2" square stock. After I made it, I sanded, primed, and painted it so that I would not have to worry about it rusting in the future.