Fuel Filter install
Thread Starter
Senior Member
Joined: Apr 2006
Posts: 685
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From: CT
Car: 1988 Iroc
Engine: 5.7L
Transmission: '96 T56, Hurst Shifter, Mech VSS
Axle/Gears: 3.45 9 Bolt
Fuel Filter install
I was wondering if i needed to "depressurize" the fuel system before i replace the fuel filter. if i do how do i go about doing that? also if there is anything special i should do to the filter/fuel lines other than just pulling the old one off and replacing it with the new one.
I ask because for my honda, i just took off the old FF and put on the new one I didnt depressurize the system or anything.
Thanks
I ask because for my honda, i just took off the old FF and put on the new one I didnt depressurize the system or anything.
Thanks
Senior Member
Joined: Jan 2009
Posts: 357
Likes: 0
From: Port Charlotte
Car: 90 formula
Transmission: auto
Re: Fuel Filter install
what i do is take gas cap off and let it sit over night or few hours if possible. ether way you have gas that's come out of the lines.
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Joined: Jun 2009
Posts: 28
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From: California
Car: 1982 Trans Am/1989 Iroc Z
Engine: T/A:1974 Corvette 350, Iroc:305 TPI
Transmission: T/A:Borg Warner 5-Speed, Iroc: Auto
Axle/Gears: T/A: Dana .44, Forgot Iroc
Re: Fuel Filter install
Just press the schrader valve on the fuel rail. some gas will shoot out, but that's how I did it. I just replaced mine on friday. Be ready by the way, gas will continue to come through the lines, so swap it as fast as possible. Goodluck!
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Senior Member
Joined: Apr 2006
Posts: 685
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From: CT
Car: 1988 Iroc
Engine: 5.7L
Transmission: '96 T56, Hurst Shifter, Mech VSS
Axle/Gears: 3.45 9 Bolt
Re: Fuel Filter install
How do i re-pressurize after? is it just a matter of turning the key on and off a few times to allow the fuel pump to get the gas from the tank to the injectors?
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Posts: 12,212
Likes: 13
From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Fuel Filter install
You gonna go ahead & put in a new pump while your in there? If your gonna do all the work to reach the filter, might as well do the pump too, since your in the tank anyways.
Joined: Oct 2008
Posts: 437
Likes: 0
From: Bucks County, PA
Car: 1991 RS
Engine: 383 stroker
Transmission: 700R4
Axle/Gears: 3.23 posi
Re: Fuel Filter install
I did mine recently and I disconnected the pump relay near the battery the removed the gas cap, then ran it til she died. There will be some gas coming out after you remove the filter so be prepared. I clamped the hose supplying that line with vise grips to minimize it. I just reconnected everything when I was done and she started right up. You might want to replace the pump relay as well.
Stephen...........what am I missing? You said since he was in the tank anyway to go ahead and replace the pump? My filter is right near my LCA.
Stephen...........what am I missing? You said since he was in the tank anyway to go ahead and replace the pump? My filter is right near my LCA.
Thread Starter
Senior Member
Joined: Apr 2006
Posts: 685
Likes: 0
From: CT
Car: 1988 Iroc
Engine: 5.7L
Transmission: '96 T56, Hurst Shifter, Mech VSS
Axle/Gears: 3.45 9 Bolt
Re: Fuel Filter install
Wait what? the fuel filters not in the tank......is it? i thought it was on the frame rail.
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iTrader: (12)
Joined: Jul 1999
Posts: 12,212
Likes: 13
From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Fuel Filter install
I was thinking of the sock filter on the pickup.
Basically, there are 2 filters. 1 to protect the pump, then a finer one under the car.
Basically, there are 2 filters. 1 to protect the pump, then a finer one under the car.
Junior Member
Joined: Jun 2009
Posts: 28
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From: California
Car: 1982 Trans Am/1989 Iroc Z
Engine: T/A:1974 Corvette 350, Iroc:305 TPI
Transmission: T/A:Borg Warner 5-Speed, Iroc: Auto
Axle/Gears: T/A: Dana .44, Forgot Iroc
Re: Fuel Filter install
Yeah youre thinking of the fuel strainer not the filter unit
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From: Pepperell, MA
Car: 1987 Trans Am
Engine: LQ9/L92
Transmission: 4L60E
Re: Fuel Filter install
Make sure to hit the filter ends with some penetrating oil ahead of time; those things are going to be stuck in place and you definitely do not want to snap the metal lines.
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From: Cleveland, Ohio
Car: 89' IROC-Z
Engine: LO3
Transmission: 700R4
Axle/Gears: 10-Bolt/2.73
Re: Fuel Filter install
I will be doing mine soon as well, but I am siphoning out my gas, so I will most likely hook my siphon up to one end of the fuel line and start sucking it all out.
2yo gas is not what I need in my car. Just kept it in there to keep moisture from building up inside the tank.
P.S. Any loctite or anti-seize on the ends of the fuel filter nuts? Just wondering since its fuel related and you don't want any contaminants in the fuel line if I should dab anything on it before re-installing.
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From: Pepperell, MA
Car: 1987 Trans Am
Engine: LQ9/L92
Transmission: 4L60E
Re: Fuel Filter install
I need to do one when I finally get the guts to try and drain the tank of 10 year old gas I've currently got in the TA I grabbed recently. Not sure if its worth me trying to clean the tank out or just buying a new one. Still up in the air right now.
no need to put anything on the threads; they get stuck on there without the help of any loc-tite
no need to put anything on the threads; they get stuck on there without the help of any loc-tite
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iTrader: (5)
Joined: Aug 2006
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From: Cleveland, Ohio
Car: 89' IROC-Z
Engine: LO3
Transmission: 700R4
Axle/Gears: 10-Bolt/2.73
Re: Fuel Filter install
I need to do one when I finally get the guts to try and drain the tank of 10 year old gas I've currently got in the TA I grabbed recently. Not sure if its worth me trying to clean the tank out or just buying a new one. Still up in the air right now.
no need to put anything on the threads; they get stuck on there without the help of any loc-tite
no need to put anything on the threads; they get stuck on there without the help of any loc-tite

and
If your going to drop and replace the tank, why not try just reclaiming it back to clean status. Some products for cleaning and prepping, just need to get some interior tank liner and do the steps as described.
http://www.summitracing.com/search/P...er-Components/
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Senior Member
Joined: Apr 2006
Posts: 685
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From: CT
Car: 1988 Iroc
Engine: 5.7L
Transmission: '96 T56, Hurst Shifter, Mech VSS
Axle/Gears: 3.45 9 Bolt
Re: Fuel Filter install
Definitely a good idea.
I will be doing mine soon as well, but I am siphoning out my gas, so I will most likely hook my siphon up to one end of the fuel line and start sucking it all out.
2yo gas is not what I need in my car. Just kept it in there to keep moisture from building up inside the tank.
P.S. Any loctite or anti-seize on the ends of the fuel filter nuts? Just wondering since its fuel related and you don't want any contaminants in the fuel line if I should dab anything on it before re-installing.
I will be doing mine soon as well, but I am siphoning out my gas, so I will most likely hook my siphon up to one end of the fuel line and start sucking it all out.
2yo gas is not what I need in my car. Just kept it in there to keep moisture from building up inside the tank.
P.S. Any loctite or anti-seize on the ends of the fuel filter nuts? Just wondering since its fuel related and you don't want any contaminants in the fuel line if I should dab anything on it before re-installing.
I need to do one when I finally get the guts to try and drain the tank of 10 year old gas I've currently got in the TA I grabbed recently. Not sure if its worth me trying to clean the tank out or just buying a new one. Still up in the air right now.
no need to put anything on the threads; they get stuck on there without the help of any loc-tite
no need to put anything on the threads; they get stuck on there without the help of any loc-tite

when you say your siphon tool what do you mean. i was just gonna stick a hose in gas tank to get the gas out. is there an easier way?
Thread Starter
Senior Member
Joined: Apr 2006
Posts: 685
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From: CT
Car: 1988 Iroc
Engine: 5.7L
Transmission: '96 T56, Hurst Shifter, Mech VSS
Axle/Gears: 3.45 9 Bolt
Re: Fuel Filter install
After reading a lot of older posts of people having trouble getting the fuel filter off due to rust, im a little worried about it giving me hell when i do it on sat. the steps i have taken to try and prevent this is i went out and hosed the fitting a ton with PB blaster, tonight im going to tap it with a mallet before and after hosing down the fittings again. Hopefully that will loosen up the rust enough where it wont give me hell.
Does anyone know the sizes for the fitting on the fuel line and the one on the filter? I think the filter i have is metric (20MM).
thanks
Does anyone know the sizes for the fitting on the fuel line and the one on the filter? I think the filter i have is metric (20MM).
thanks
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