Easiest way to depressurize fuel system? - 2003-04 Mach 1 Registry Owners Club

Mach420_ · 10-28-2016, 11:22 AM

Can somebody please tell me whats the easiest way to depressurize the fuel system? Planning on changing the fuel filter. I've seen a few methods on youtube and a few on here, but I just want to know what was the easiest for you guys. Here's what I found...

1. Simply disconnect the fuel reset switch in the trunk (seems fishy)
2. Remove the fuse for the fuel pump and give her a couple of cranks
3. Or remove the fuse and let her run until she dies

And also to REpressurize it, turn the key on a few times to build up the pressure...is this correct??

Thanks guys!

fastlane · 10-28-2016, 11:59 AM

Pull the fuel pump fuse under the hood and run the car until it dies. Reinstall and key on to pressurize.

ab_mach1 · 10-28-2016, 12:59 PM

I unplugged the inertia switch in the trunk while it was running. Seemed to do the trick for me.

Mach828 · 10-28-2016, 01:12 PM

I just hold a rag up, break the line free, and hope I don't get any fuel on my face.

DSG2003Mach1 · 10-28-2016, 02:03 PM

tripping the inertia switch itself wont do anything, the car has to be running or try to start it afterward. Theres a one way valve system in/after the pump (varies between models) that keeps fuel in the lines when you turn the car off so it starts up quickly later.

you can also put a rag under the valve on the pass fuel rail and press it down (slowly!) with a small screw driver. You really dont get much fuel out of the valve and if you do it slow it doesnt spray out or anything.

Mach420_ · 10-31-2016, 12:56 AM

That seems easy enough. You wouldnt happen to have a picture of that valve, would you?

10-28-2016, 11:22 AM	#1
Mach420_ Registered User Join Date: Apr 2014 Location: Tempe, AZ Posts: 56	Easiest way to depressurize fuel system? Can somebody please tell me whats the easiest way to depressurize the fuel system? Planning on changing the fuel filter. I've seen a few methods on youtube and a few on here, but I just want to know what was the easiest for you guys. Here's what I found... 1. Simply disconnect the fuel reset switch in the trunk (seems fishy) 2. Remove the fuse for the fuel pump and give her a couple of cranks 3. Or remove the fuse and let her run until she dies And also to REpressurize it, turn the key on a few times to build up the pressure...is this correct?? Thanks guys!

10-28-2016, 11:59 AM	#2
fastlane Registered User Join Date: Mar 2011 Location: Fort Worth, TX Posts: 209	Re: Easiest way to depressurize fuel system? Pull the fuel pump fuse under the hood and run the car until it dies. Reinstall and key on to pressurize.

10-28-2016, 12:59 PM	#3
ab_mach1 Lorraine's driver Join Date: Apr 2012 Location: Indianapolis, IN Posts: 2,442	Re: Easiest way to depressurize fuel system? I unplugged the inertia switch in the trunk while it was running. Seemed to do the trick for me. __________________ Instagram: @azurblumach1 SCT X3 with LaSota Racing tune Borla Stingers w/JBA off road H pipe MGW short shifter w/comfort handle Eibach Sportlines w/Koni STR.T's and Maximum Motorsports CC plates

10-28-2016, 01:12 PM	#4
Mach828 Dark Knight Join Date: Nov 2009 Location: Albuquerque, NM Posts: 5,759	Re: Easiest way to depressurize fuel system? I just hold a rag up, break the line free, and hope I don't get any fuel on my face. __________________ Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage

10-28-2016, 02:03 PM	#5
DSG2003Mach1 700 HP Mach Join Date: Nov 2003 Location: Orlando, FL Posts: 8,384	Re: Easiest way to depressurize fuel system? tripping the inertia switch itself wont do anything, the car has to be running or try to start it afterward. Theres a one way valve system in/after the pump (varies between models) that keeps fuel in the lines when you turn the car off so it starts up quickly later. you can also put a rag under the valve on the pass fuel rail and press it down (slowly!) with a small screw driver. You really dont get much fuel out of the valve and if you do it slow it doesnt spray out or anything. __________________ 03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater

10-31-2016, 12:56 AM	#6
Mach420_ Registered User Join Date: Apr 2014 Location: Tempe, AZ Posts: 56	Re: Easiest way to depressurize fuel system? That seems easy enough. You wouldnt happen to have a picture of that valve, would you?

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