how do i remove resting fuel pressure

[zimvsdib]

Looking for a quick tip on how to remove pressure in a system. I am talking about after you have run the car and you don't want to wait 2hrs for rest pressure to lower. I'd prefer not to spray gas everywhere while doing some work tonight.

I know Dave mentioned his trick to doing this a but i couldn't find it again.

[David T]

Looking for a quick tip on how to remove pressure in a system. I am talking about after you have run the car and you don't want to wait 2hrs for rest pressure to lower. I'd prefer not to spray gas everywhere while doing some work tonight.

I know Dave mentioned his trick to doing this a but i couldn't find it again.

I don't know about Dave's "trick" but the way to remove rest pressure is to loosen a banjo fitting. One easy spot is to wrap a rag around the one on the cold start valve and loosen the banjo bolt on top.

[zimvsdib]

I don't know about Dave's "trick" but the way to remove rest pressure is to loosen a banjo fitting. One easy spot is to wrap a rag around the one on the cold start valve and loosen the banjo bolt on top.

Thanks David. Thats what i usually end up doing. Maybe i was dreaming but i thought there was a way to do a bypass at the RPM that would remove that rest pressure.

[zimvsdib]

i think i would just engage the CSV to spray some fuel out of the line.

[ALEXAKOS]

Remove air filter housing assembly and press down the air flow disk a couple of times;)

Not that even if you do relieve pressure there will still be fuel in all hoses or anything fuel related you unscrew

[TTait]

Start the car, then while it is running reach down by the hood release and trip the rollover plunger. Pump will stop and the car will starve for fuel, burning off most of the pressure. Then you can press down on the air meter flap to clear any residual pressure. Better than dumping all the raw fuel into the system, this way you only dump a little.

Make sure to reset the plunger shortly after, before you forget.

T

[Bitsyncmaster]

My trick is to pull the RPM relay connector and jumper the brown wire to the double yellow/red wires. That will power up the FV and dump the rest pressure back into the tank. You will hear the FV change "tune" when the pressure is gone (about 60 seconds).

[ALEXAKOS]

Wow, so many ways to finger a DeLorean;)

[krs09]

Remove air filter housing assembly and press down the air flow disk a couple of times;)

Not that even if you do relieve pressure there will still be fuel in all hoses or anything fuel related you unscrew

+1
After running the car the plate will be hard to press down (still has pressure) after pressing down a few times you will feel it get much easier so easy that you can just tap it and it will bounce up and down (pressure diminished) ... well thats how I did it.

[David T]

+1
After running the car the plate will be hard to press down (still has pressure) after pressing down a few times you will feel it get much easier so easy that you can just tap it and it will bounce up and down (pressure diminished) ... well thats how I did it.

Pressing down on the air sensor plate won't relieve all of the pressure. The injectors shut off at a preset pressure. Popping the inertia switch (or pulling fuse #7) while the motor is running may be the best way without touching a fitting. As posted you still have to deal with the fuel in the lines. Doing the plug swap may also be a good way to force the cold start valve open. That you can do with the motor off (just turn on the ignition).

[zimvsdib]

My trick is to pull the RPM relay connector and jumper the brown wire to the double yellow/red wires. That will power up the FV and dump the rest pressure back into the tank. You will hear the FV change "tune" when the pressure is gone (about 60 seconds).



Awesome. Thats what i was looking for!

Thank you very much.

[PJ Grady Inc.]

My trick is to pull the RPM relay connector and jumper the brown wire to the double yellow/red wires. That will power up the FV and dump the rest pressure back into the tank. You will hear the FV change "tune" when the pressure is gone (about 60 seconds).

I never tried that! I've jumped the circuit a thousand times but not for that purpose. I really like that idea and I'll check it out to see how effective it is! just goes to show that two heads are better than one.

Rob Grady

[David T]

I never tried that! I've jumped the circuit a thousand times but not for that purpose. I really like that idea and I'll check it out to see how effective it is! just goes to show that two heads are better than one.

Rob Grady

Or you can do the same thing with the plug for the hot start relay and run the cold start valve.

[Bitsyncmaster]

Or you can do the same thing with the plug for the hot start relay and run the cold start valve.

CSV only get power with starter cranking. Even if it worked, your dumping the gas into the intake.

[David T]

CSV only get power with starter cranking. Even if it worked, your dumping the gas into the intake.

You can make up a switch that you temporarily connect to run the CSV by plugging into the hot start plug and connecting the other end to a power source. Yes, you would be dumping fuel into the motor but if the fuel pump isn't running it wouldn't be much.