C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

how to change fuel filter??

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Old May 30, 2008 | 08:22 AM
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Default how to change fuel filter??

OK, so I just got my '95 back from the body shop and decided to put it over the pit and check out the work they did. While I was there, I changed the oil and decided it was time for a fuel filter as well. I thought it would be easy to change, but I don't see how you are supposed to get to the top line fitting. I burned my arm pretty good trying to reach a stubby wrench up there but still no room to move. The bottom one is easily accessible, it looks like you have to remove the exhaust?? Also, what is the thick yellow wire right there? looks like a piece of extention cord.

Anyone know an easy way to change the fuel filter on C4-LT1's? I did a search but don't see it outlined.

Thanks for any tips!
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Old May 30, 2008 | 08:32 AM
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Unbolt the fuel line bracket in the engine compartment (by passenger side of engine), and also unbolt the bracket for the fuel filter and the line bracket on the frame a couple feet back from the filter. This will allow you to move the line a bit. Make sure to relieve the pressure in the system - you may be able to do this by pulling the fuel pump fuse and running the car until it dies. Also relieve pressure at the Schrader valve (on the lines at the back of the intake manifold).
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Old May 30, 2008 | 09:21 AM
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Originally Posted by pianoguy
Unbolt the fuel line bracket in the engine compartment (by passenger side of engine), and also unbolt the bracket for the fuel filter and the line bracket on the frame a couple feet back from the filter. This will allow you to move the line a bit. Make sure to relieve the pressure in the system - you may be able to do this by pulling the fuel pump fuse and running the car until it dies. Also relieve pressure at the Schrader valve (on the lines at the back of the intake manifold).

pianoguy is right, if you don't relieve the fuel line pressure, you are going to spray gasoline all over you and your garage.
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Old May 30, 2008 | 09:55 AM
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A good time to put in long tube headers - gives you much more room to get at the fuel filter ;-)

Make sure to use line a line wrench on the line fittings, too.
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Old May 30, 2008 | 11:10 AM
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This may help. Read below from another post I had...



I also have a 95 vert. The vert has the x-brace and the filter top nut is hard to get to. If I remember correctly the cat is in the way. If you use the method below and pull it with the front line attached it is extremely easy. A one hour job, if that. You may have to teach the dealership the procedure. I had to explain it to Jiffy Lube one day. Luckily I had the forum and they didn't.


Wait for cat and engine to cool.
Jack car up.
Remove the x-brace.
Pull fuse for the fuel pump. (Relieves pressure when engine is cranked below)
Loosen gas cap. (Relieves pressure)
Crank engine a few times.
Release pressure at valve.
Disconnect fuel line at engine with Lisle Fuel line tool. (Be ready to catch a little gas)
Unhook fuel line from inner fender tie down.
Disconnect fuel filter rear nut. (Be ready to catch some gas)
Pull fuel filter, with front fuel line still connected, from bottom of car.
Swap filter and reinstall.

Piece of cake.




Here's a quick write up I did two years ago.

Replaced the fuel filter yesterday. It took less that two hours. With the proper tools and knowledge it could be done in about an hour or so. I pulled the car up on some plastic Rhino ramps I picked up from Autozone for $30. I then pulled the FP1 fuse and ran the engine till it died. Next I tried to start it a few more times to clear out all the fuel. Then I removed the fuel line in the engine compartment with one of those plastic Lisle tools from Pep-boys. (Be carefull some fuel will still shoot out under pressure. Then I completely removed one side of the x-brace (14 bolts). Next I unbolted the circular bracket that holds in the fuel filter. I then unbolted the bottom line with a 19 wrench to hold the filter and a 5/8 wrench to unscrew the line bolt. There is also a factory rubber peice with a tie wrap around it that must be removed to seperate the incoming and return fuel lines. After all these connections are loose the fuel filter slips out easily from below. Install the new fuel filter once the old one and the upper line have been removed. To reinstall simply reverse the steps.

Lisle fuel line tool. If I remember correctly under $10 from pep-boys.
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Old May 30, 2008 | 11:10 AM
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I did pull the pump fuse and rand down the pressure, but there is no room for a line wrench on the top fitting. I didn't think about undoing the other end of the line and pulling the whole thing down--that's a great idea. It looks like I'll have to cut the strap holding the filter, the nut is on top with no access. they must have installed it before the motor!

Thanks for the help!!

And thanks for the tip on the tool, had no idea I would need one for the top line. I really thought this would be a 5 min. job when I was standing underneath it...

Last edited by gungatim; May 30, 2008 at 11:12 AM.
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Old May 30, 2008 | 02:29 PM
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Originally Posted by pmihaltian
pianoguy is right, if you don't relieve the fuel line pressure, you are going to spray gasoline all over you and your garage.
I disagree. I dont belive there is enough constant pressure to "spray gasoline all over you and your garage". You may get a couple drips !
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Old May 30, 2008 | 02:53 PM
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Originally Posted by corvettedan22
I disagree. I dont belive there is enough constant pressure to "spray gasoline all over you and your garage". You may get a couple drips !
The first time I unhooked the line without completely relieving the pressure my hands were soaked in fuel and my arms got sprayed pretty good. I changed it outside so the garage was spared.

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Old May 30, 2008 | 10:52 PM
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Default Fuel filter

This is how I removed my fuel filter from my 94.
1. I remove the bottom nut from the filter.
2. remove the bracket that holds the filter
3. there is a rubber with a tierap that is holding the two lines together cut the tierap
4. undo the clip by the passenger side of the engine that is holding both lines.
5. Since the lines going to the injectors are flexibles, just pull the filter up through the side of the egine.
6. remove filter and put new filter on.
7. Put everything back on.

Don't forget to remove the fuel pump fuse.
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