Depressurizing fuel system

[BuickMike231]

Hey guys, this might be kind of a newbie question but I'm not sure. I just picked up some new injectors and a fuel regulator and they both state in the instructions to depressurize the system first. I'm sure it's something not too difficult just wan't sure exactly how to go about doing this. Any help would be greatly appreciated, thanks!!

[kh440]

This is what works for me:
1: unplug the fuel sending unit (3 wire plug at the tank); start the car a few times. It will probably run for a coupl eof seconds.

2: unscrew the fuel cap and reinstall

There will still be some fuel loss, but it will be a lot less severe.

good luck!

[turbojd]

On the fuel rail by the fuel pressure regulator take off the cap and push in the schrader valve to de-pressurize the fuel system. If somebody has a rail mounted fuel pressure guage on the end of the rail, then the schrader valve will not be there.

[BuickMike231]

Awesome that's what I thought but just wanted to make sure before I dove in head first! Thanks guys!!

[novaderrik]

pull the fuel pump fuse when the engine is idling. when it dies, disconnect the battery and put the fuse back in.

[87Regal3.8SFI]

I wrap a rag around the schrader valve/fuel rail and use a small flat tip screw driver to push in. Some fuel resistant gloves and splash proof eye goggles are also a good thing to have on while doing this.

Or you could let the car sit overnight and then do it. I have found it's a little less messy that way as the pressure has usually dropped.

[Blown&Injected]

Originally Posted by kh440

This is what works for me:
1: unplug the fuel sending unit (3 wire plug at the tank); start the car a few times. It will probably run for a coupl eof seconds.

2: unscrew the fuel cap and reinstall

There will still be some fuel loss, but it will be a lot less severe.

good luck!

I send power right from the alternator, so for me, I just pull the fuse right there but kh has the right method.

Just keep cranking it a few times after it first stalls and there will be almost no fuel at the end of the rail.

[aminga]

Or if you're into simple, pull power to the ECM (orange wire right behind the battery) and crank until it dies.

I wouldn't simply press in the shrader valve. spraying gas everywhere isn't exactly safe.

[DCVING 6]

MAKE SURE YOU DISCONNECT THE BATTERY!!! The fuel pressure regulator area is a big fire hazard being right behind the posative outpost on the altenator.

[Blown&Injected]

kill the computer with that wire and I doubt the injectors are firing so there will probably still be all the pressure in the rail - got to kill power to the pump and keep the injectors going

[BuickMike231]

Thanks for the input guys, I really appreciate it! I'll hopefully start getting to everything this weekend. I'll keep ya posted how it all goes, I'm doing injectors, a Turbo Tweak chip, fuel pressure regulator, fuel pump, and the hot wire kit.

[kh440]

It's all pretty straightforward: definitely disconnect that orange wire before you do the chip, and maybe a very thin coat of vaseline on the injector (and fpr) o-rings and you should be done with everything in 3 hours or less. Worst part will be wrestling the fuel tank in and out.

[87Regal3.8SFI]

When dropping the tank for the fuel pump R&R, some sort of a floor jack can be of help. That's how I did mine. Biggest pain was keeping it centered on the jack. when I was reinstalling it.

[BuickMike231]

Originally Posted by kh440

It's all pretty straightforward: definitely disconnect that orange wire before you do the chip, and maybe a very thin coat of vaseline on the injector (and fpr) o-rings and you should be done with everything in 3 hours or less. Worst part will be wrestling the fuel tank in and out.

I've heard the tank can be a pain, I think my buddy might come over to give me an extra set of hands for that part. From the looks of it the rest shouldn't be too bad....shouldn't haha. Thanks for the input guys!

[DCVING 6]

on the fuel pump, make sure you remove the pulsator and replace it with the piece of fuel line they provide you.

[Blown&Injected]

You SHALL disconnect the battery - which does the same as disconnecting the orange wire.

There is the alternator post right next to the FPR - hit that post on the back of the ALT with a wrench that will probably have a good ground with raw fuel around and the job will take a turn for the worse.

About the tank - I just let the thing fall on my chest. It is dirty and uncomfortable, but it does get the job done fast. Oh yeah - eyeball protection!

[BuickMike231]

Hey guys, sorry to take so long to post again, it's been a busy week! Everything is now in the car and it's running great! Zero knock under boost and the car's running very nicely now, I'm pumped! Thank you all for your input, it is much appreciated!!!!