I'm passing on some info that may help some others working on their fuel system.
I have a '93 TTZ and did some fuel repairs recently. I replaced a component in my FPCU and also replaced the pump. I went to use the car last weekend and smelled a raw fuel smell. Found a hose leaking at the fuel damper. It crossed my mind that I had a new fuel damper and a new fuel regulator from years ago still in the original Nissan box. Funny, I thought I had replace those but life must have gotten in the way and I just put them in my stock and never used them. Anyway, I replaced both the damper and the regulator. This weekend, my wife and I went to take the Z for a short coffee run and again, I smelled raw fuel. Damn hose on the regulator this time, was leaking. I tightened up the clamp, but still no good.
I replaced both hoses on the regulator with the Gates Barricade hose and all is good. Here's why I'm telling all this..........
The last weekend when I went to replace both the damper and the regulator, I wanted to dump the fuel system pressure before working on the car. I normally would use my software (Dr. 300zx I think it's called) to turn off the fuel pump and drain the pressure. But this time I just pulled the fuse under the hood. Guess what??? Well, if you pull the fuse, the car won't start and drink that last bit of fuel. So I pulled the fuse while the car was running. And guess what????
The car continues to run! So if anyone is thinking to 'pull the fuel pump fuse' under the hood (under the small plastic cover along with the window/seat fuses and such), that will not work.
If you pull the fuse and then try to start the car, the car will not start and will leave the fuel system pressurized.
If you pull the fuse while the car is running, the pump will continue to run, along with the car, and it will not drain the fuel system pressure. Anyway, I just learned that this weekend and see that you'd need to use the software to either kill the fuel pump while the car is running, or pull the actual fuel pump relay (which would be more of a pain to get to just to release the fuel system pressure). But pulling the fuel pump 'fuse' in this scenario to drop the pressure will not work. Vinnie
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