how do you depressurize the fuel system?

YNOT · June 10th, 2007, 11:52 PM

how do you depressurize the fuel system?

i'm going to replace my fuel pump, fuel filter, add a adjustable fuel pressure regulator with gauge.

any tips on the jobs ahead?

Tony_90fox · June 11th, 2007, 12:01 AM

should be a button in your hatch behind the interior piece, right by the where the striker comes down...At least that is where mine is...Hit the button and then turn on the key, if you dont hear the fuel pump turn on, then go for it.

YNOT · June 11th, 2007, 12:48 AM

where?

ryans88gt · June 11th, 2007, 01:04 AM

OK, all that button does is cut power to your fuel pump. Which is also achieved by not putting you key in the ignition and turning it, so really there is no reason to do that.

You fuel system only stays under pressure for about 5-10 minutes after the car has been running. The regulator slowly bleeds pressure and after a few minutes with the car off and the ignition in the off position there shouldn't be any fuel pressure. If you are really concerned (its only 39 PSI) you can get a pressure checker to make sure there is no pressure.

usmcsawgunner · June 11th, 2007, 01:06 AM

theres a collision-actuated sensor in the fuel system that will shut off power to the fuel pump. in most sedans and verts its in the trunk on the left hinge support and for the hatch its in the trunk on the left taillight panel...you can pretty much bang on it to deactivate it or you can take off the plastic panel to get to it....

zero · June 11th, 2007, 11:51 AM

its called an inertia switch. up is open, down is closed. you want open. dont just wait for it to bleed down. thats rediculous, you dont want to take ristks with fuel and your health. open your hatch and remove the paneling immediately behind your drivers sie tailight. you can take a flathead and gently pry up on the little red button. after it is up, start the car and let it run untill the car dies. your fuel system is now depressurized.

ryans88gt · June 11th, 2007, 01:02 PM

Originally Posted by zero

its called an inertia switch. up is open, down is closed. you want open. dont just wait for it to bleed down. thats rediculous, you dont want to take ristks with fuel and your health. open your hatch and remove the paneling immediately behind your drivers sie tailight. you can take a flathead and gently pry up on the little red button. after it is up, start the car and let it run untill the car dies. your fuel system is now depressurized.

There is nothing dangerous about waiting 5 minutes for your fuel pressure to bleed down. In a return style fuel system, you loose fuel pressure almost immediately after the pump is shut off. Please do explain what could possibly happen, even with some residual pressure you will still spill the same amount of fuel as with no pressure. Nobody is suggesting that you put your mouth over the fitting right when you remove it

86blkmustang · June 11th, 2007, 01:22 PM

To depressurize the fuel system is to locate the inertia switch which is behind the interior piece on the driver side back. Start ur car then un plug ur switch then ur car will run for a couple of seconds to get the fuel pressure out of the system then when it cuts off ur system has been depressurized. The u can work on the fuel system, there still might be some fuel still in the system especially in the fuel filter. But when u got the fuel system done the u hook the switch up press the button on the top of the switch and turn your key onf 4 or 5 times to build the pressure and fuel back up.

YNOT · June 11th, 2007, 02:59 PM

thanks everyone.

Tony_90fox · June 11th, 2007, 05:42 PM

Originally Posted by ryans88gt

Originally Posted by zero

its called an inertia switch. up is open, down is closed. you want open. dont just wait for it to bleed down. thats rediculous, you dont want to take ristks with fuel and your health. open your hatch and remove the paneling immediately behind your drivers sie tailight. you can take a flathead and gently pry up on the little red button. after it is up, start the car and let it run untill the car dies. your fuel system is now depressurized.

There is nothing dangerous about waiting 5 minutes for your fuel pressure to bleed down. In a return style fuel system, you loose fuel pressure almost immediately after the pump is shut off. Please do explain what could possibly happen, even with some residual pressure you will still spill the same amount of fuel as with no pressure. Nobody is suggesting that you put your mouth over the fitting right when you remove it

Why not take one minute and remove the paneling and flip the switch instead of waiting five minutes and risking gas on your garage floor or body parts?

zero · June 11th, 2007, 08:06 PM

^^ haha well, someones thinking.

Stangzilla · June 11th, 2007, 10:51 PM

OK here is a thought if you still have the stock fuel rails why dont you just put a rag over the schrader valve in the engine bay and slowly push it in with a small screwdriver and be done with it..

nolife · June 12th, 2007, 09:35 AM

Stangzilla, that's what I was thinking. I've done that many times. At most, there is like an ounce of fuel that comes squirts out for about one second.

neverfastenough1 · June 12th, 2007, 09:40 AM

Yeah I was wandering why nobody had suggested that.

ryans88gt · June 12th, 2007, 01:41 PM

Originally Posted by Tony_90fox

Originally Posted by ryans88gt

Originally Posted by zero

its called an inertia switch. up is open, down is closed. you want open. dont just wait for it to bleed down. thats rediculous, you dont want to take ristks with fuel and your health. open your hatch and remove the paneling immediately behind your drivers sie tailight. you can take a flathead and gently pry up on the little red button. after it is up, start the car and let it run untill the car dies. your fuel system is now depressurized.

There is nothing dangerous about waiting 5 minutes for your fuel pressure to bleed down. In a return style fuel system, you loose fuel pressure almost immediately after the pump is shut off. Please do explain what could possibly happen, even with some residual pressure you will still spill the same amount of fuel as with no pressure. Nobody is suggesting that you put your mouth over the fitting right when you remove it

Why not take one minute and remove the paneling and flip the switch instead of waiting five minutes and risking gas on your garage floor or body parts?

I think my garage floor will be OK with an once of gas on it... jeese, do you need a skirt too...

zero · June 12th, 2007, 02:11 PM

^^because people like me who work on jets for a living and are around hazardous materials like hydraulic fluid, engine oil, and gasoline products know its not really anything to mess with too often. sure ill wear a skirt, but when your kids come out with a few extra chromosomes.. dont say i didnt warn you. whats so pussy about erring on the side of caution anyways?

ryans88gt · June 12th, 2007, 04:18 PM

Bringing disabled children into this is hardly called for...

Nothing wrong with being cautious, but saying something isn't safe without any reasoning seems pretty "mom" to me. Trust me, a return style fuel system has no fuel pressure 5 minutes after its been running. Furthermore, even if it had 100 PSI fuel pressure, that would not result in any more fuel exposure since the pump is still off, only an ounce or so of gas would be spilled and the pressure would drop to zero instantly (b/c liquids do not compress much).

There is nothing dangerous about it, most shops do it this way because a lot of cars do not have an inertia switch and some are impossible to get to or have a tendency to get stuck in the off position.

Next you'll be saying it's bad to wash your hands in parts cleaner...lol

PS all my children have the normal number of chromosomes...46...I dated a girl with three nipples once though...

Tony_90fox · June 12th, 2007, 05:37 PM

Originally Posted by ryans88gt

Originally Posted by Tony_90fox

Originally Posted by ryans88gt

Originally Posted by zero

its called an inertia switch. up is open, down is closed. you want open. dont just wait for it to bleed down. thats rediculous, you dont want to take ristks with fuel and your health. open your hatch and remove the paneling immediately behind your drivers sie tailight. you can take a flathead and gently pry up on the little red button. after it is up, start the car and let it run untill the car dies. your fuel system is now depressurized.

There is nothing dangerous about waiting 5 minutes for your fuel pressure to bleed down. In a return style fuel system, you loose fuel pressure almost immediately after the pump is shut off. Please do explain what could possibly happen, even with some residual pressure you will still spill the same amount of fuel as with no pressure. Nobody is suggesting that you put your mouth over the fitting right when you remove it

Why not take one minute and remove the paneling and flip the switch instead of waiting five minutes and risking gas on your garage floor or body parts?

I think my garage floor will be OK with an once of gas on it... jeese, do you need a skirt too...

My name isnt Jesse, it's Tony. Most of us dont want to be lazy and wait, why not open the hatch and get to work in under the time it takes you to wait. Seems like you have a horrible attitude on what other people say.

I would tell your girlfriend to wear skirts more often, but half the time her clothes are thrown on the floor anyway so it wouldnt matter.

HMUSN · June 12th, 2007, 05:43 PM

resorting to name calling huh...

how fun

Tony_90fox · June 12th, 2007, 05:52 PM

Who is name calling?

June 10th, 2007, 11:52 PM	#1
YNOT Regular 1989 GT Hatch Join Date: Mar 2007 Posts: 227 iTrader: 0 reviews	how do you depressurize the fuel system? how do you depressurize the fuel system? i'm going to replace my fuel pump, fuel filter, add a adjustable fuel pressure regulator with gauge. any tips on the jobs ahead?

June 11th, 2007, 12:01 AM	#2
Tony_90fox Banned Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,803 iTrader: 0 reviews	should be a button in your hatch behind the interior piece, right by the where the striker comes down...At least that is where mine is...Hit the button and then turn on the key, if you dont hear the fuel pump turn on, then go for it. __________________ [SIGPIC][/SIGPIC] [B][U]MM Sapper Squad[/U][/B] [QUOTE=Regency 2007;1676187]MSO's stupidity has never stopped amazing me since the day he joined this forum.[/QUOTE]

June 11th, 2007, 01:04 AM	#4
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	OK, all that button does is cut power to your fuel pump. Which is also achieved by not putting you key in the ignition and turning it, so really there is no reason to do that. You fuel system only stays under pressure for about 5-10 minutes after the car has been running. The regulator slowly bleeds pressure and after a few minutes with the car off and the ignition in the off position there shouldn't be any fuel pressure. If you are really concerned (its only 39 PSI) you can get a pressure checker to make sure there is no pressure. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

June 11th, 2007, 11:51 AM	#6
zero Regular Join Date: Feb 2007 Location: persian gulf Posts: 253 iTrader: 0 reviews	its called an inertia switch. up is open, down is closed. you want open. dont just wait for it to bleed down. thats rediculous, you dont want to take ristks with fuel and your health. open your hatch and remove the paneling immediately behind your drivers sie tailight. you can take a flathead and gently pry up on the little red button. after it is up, start the car and let it run untill the car dies. your fuel system is now depressurized. __________________ 92 lx 351W w/ 60 overbore holley 600cfm carb weiand stealth dual plane intake 240/246@.510 cam bbk long tube headders msd coil 5 lug axle conversion 3.55 gears mach1 style 17" rims

June 11th, 2007, 08:06 PM	#11
zero Regular Join Date: Feb 2007 Location: persian gulf Posts: 253 iTrader: 0 reviews	^^ haha well, someones thinking. __________________ 92 lx 351W w/ 60 overbore holley 600cfm carb weiand stealth dual plane intake 240/246@.510 cam bbk long tube headders msd coil 5 lug axle conversion 3.55 gears mach1 style 17" rims

June 11th, 2007, 12:48 AM	#3
YNOT Regular 1989 GT Hatch Join Date: Mar 2007 Posts: 227 iTrader: 0 reviews	where?

June 11th, 2007, 01:06 AM	#5
usmcsawgunner Regular 1993 Mustang GT 13.2 @98.54 Join Date: Apr 2007 Location: Kaneohe Bay, Hawaii Posts: 433 iTrader: 0 reviews	theres a collision-actuated sensor in the fuel system that will shut off power to the fuel pump. in most sedans and verts its in the trunk on the left hinge support and for the hatch its in the trunk on the left taillight panel...you can pretty much bang on it to deactivate it or you can take off the plastic panel to get to it....

June 11th, 2007, 01:22 PM	#8
86blkmustang Regular Join Date: Jan 2007 Location: Seaford, Delaware Posts: 106 iTrader: 0 reviews	To depressurize the fuel system is to locate the inertia switch which is behind the interior piece on the driver side back. Start ur car then un plug ur switch then ur car will run for a couple of seconds to get the fuel pressure out of the system then when it cuts off ur system has been depressurized. The u can work on the fuel system, there still might be some fuel still in the system especially in the fuel filter. But when u got the fuel system done the u hook the switch up press the button on the top of the switch and turn your key onf 4 or 5 times to build the pressure and fuel back up.

June 11th, 2007, 02:59 PM	#9
YNOT Regular 1989 GT Hatch Join Date: Mar 2007 Posts: 227 iTrader: 0 reviews	thanks everyone.

June 11th, 2007, 10:51 PM	#12
Stangzilla MM Fanatic Join Date: Aug 2006 Location: On my way to Baines's house!! Posts: 3,298 iTrader: 0 reviews	OK here is a thought if you still have the stock fuel rails why dont you just put a rag over the schrader valve in the engine bay and slowly push it in with a small screwdriver and be done with it.. __________________ Rotating The Earth 1320 Feet At A Time!! Today, I found out that when I masturbate at night while watching internet porn I cast a huge shadow on the curtain and the entire street is able to see it.

June 12th, 2007, 09:35 AM	#13
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	Stangzilla, that's what I was thinking. I've done that many times. At most, there is like an ounce of fuel that comes squirts out for about one second. __________________

June 12th, 2007, 09:40 AM	#14
neverfastenough1 Hardcore Enthusiast 2002 Mustang GT Join Date: May 2007 Location: Savannah, Ga Posts: 2,789 iTrader: 3 reviews	Yeah I was wandering why nobody had suggested that. __________________

June 12th, 2007, 02:11 PM	#16
zero Regular Join Date: Feb 2007 Location: persian gulf Posts: 253 iTrader: 0 reviews	^^because people like me who work on jets for a living and are around hazardous materials like hydraulic fluid, engine oil, and gasoline products know its not really anything to mess with too often. sure ill wear a skirt, but when your kids come out with a few extra chromosomes.. dont say i didnt warn you. whats so pussy about erring on the side of caution anyways? __________________ 92 lx 351W w/ 60 overbore holley 600cfm carb weiand stealth dual plane intake 240/246@.510 cam bbk long tube headders msd coil 5 lug axle conversion 3.55 gears mach1 style 17" rims

June 12th, 2007, 04:18 PM	#17
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	Bringing disabled children into this is hardly called for... Nothing wrong with being cautious, but saying something isn't safe without any reasoning seems pretty "mom" to me. Trust me, a return style fuel system has no fuel pressure 5 minutes after its been running. Furthermore, even if it had 100 PSI fuel pressure, that would not result in any more fuel exposure since the pump is still off, only an ounce or so of gas would be spilled and the pressure would drop to zero instantly (b/c liquids do not compress much). There is nothing dangerous about it, most shops do it this way because a lot of cars do not have an inertia switch and some are impossible to get to or have a tendency to get stuck in the off position. Next you'll be saying it's bad to wash your hands in parts cleaner...lol PS all my children have the normal number of chromosomes...46...I dated a girl with three nipples once though... __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

June 12th, 2007, 05:52 PM	#20
Tony_90fox Banned Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,803 iTrader: 0 reviews	Who is name calling? __________________ [SIGPIC][/SIGPIC] [B][U]MM Sapper Squad[/U][/B] [QUOTE=Regency 2007;1676187]MSO's stupidity has never stopped amazing me since the day he joined this forum.[/QUOTE]

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