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Old 09-02-2017, 01:07 PM   #1
Jonasan308
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1999 SC1
Default Possible fuel filter issue

Ive been bedridden the last few days and the boredom made me think and look around on the net. Well. In the midst of that, i thought to look into my issue with that noise near the fuel filter. I found a site that had info about clogged fuel filters.
http://www.agcoauto.com/content/news/p2_articleid/219

According to the site, the clogged filter causes power losses, particularly when climbing hills. Also says that it can show up as a O2 sensor.

I went and had my codes read, and got back P0442 and the 02 sensor code (dont remember the numbers for that one)

In addition, im having the weak starts, and i do feel a loss in power when climbing hills. I thought the loss of power was something involving the valve body and it slipping, but it never went away after fixing the valve body.

And, i did find the source of the noise. The hissing noise is the fuel filter, and pressing on it changes the frequency of the noise. So, i suppose if say it is clogged, that a seal blew out somewhere and is causing the hissing.

It seems i forgot to ask how much renting a fuel pressure gauge would be at the store. I meant to ask but i forgot right away. Ill go back and rent it and check the pressure at various points.
I suppose i won't be able to look at pressure while driving right?

...
1999 Saturn SL1-129k at purchase(may 2016)-139k when wrecked(September 2016)

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Old 09-02-2017, 01:55 PM   #2
OldNuc
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1998 SC2
Default Re: Possible fuel filter issue

That article is not applicable to your car. I have never seen or heard of an S-Series filter regulator plug up. It is near impossible to have happen for several reasons. If you are so inclined then just replace the entire assembly as you may have an aftermarket POS in there which will eventually fail to low pressure which will cause what you are seeing. Rock Auto WIX 33731 ONLY, do not substitute. Should be listed for your car but if not use manufacturers part number look up.

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Old 09-02-2017, 01:57 PM   #3
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1994 SL2
Default Re: Possible fuel filter issue

Honestly I was having acceleration issues, especially uphill, and changing my fuel filter helped a lot. If you can do it yourself, they are not expensive. One of the things I personally experienced that you have is weak starts sometimes. I'd have to press harder on the peddle to accelerate. It probably couldn't hurt to change it anyway, and they aren't very expensive. I believe a filter should be sub 20 bucks and some of your time.

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Old 09-02-2017, 02:09 PM   #4
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1999 SC1
Default Re: Possible fuel filter issue

I have the '99 which apparently has the filter and regulator together so my filter seems to be more expensive.
Would the brand of my current filter be on the outside? I dont remember if the guy i bought the car from said the fuel filter was replaced. Mine seems to be relatively shiny, but it could be the metal is resistant to rust. It seems easy enough to do, but id like to be sure its the problem before spending money on it.

...
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Old 09-02-2017, 02:19 PM   #5
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1998 SC2
Default Re: Possible fuel filter issue

The canister is stainless steel and they are not marked with any ID info usually. There is only a pressure test. Get a fuel pressure tester and see if it leaks down and delivers fuel at 45-51 PSI at idle. Yes they are expensive and that is why people buy the cheap POS.

Buy a pressure tester from harbor freight. https://www.harborfreight.com/fuel-i...ter-62623.html Worth the $20.00 it costs.

Last edited by OldNuc; 09-02-2017 at 02:27 PM..

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Old 09-02-2017, 02:59 PM   #6
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2003 L-Series 3.0L Sedan
Default Re: Possible fuel filter issue

You can borrow a fuel pressure gauge from Autozone or Advance Auto using a credit card - the value of the pressure gauge is applied to your credit card but isn't charged when returned in the same condition it was loaned out. In effect, its a free loaner for approximately 30 days (one credit card cycle?). My A-z has placemats on every counter with images of loaner tools. If you decide to borrow one, see if they have a longer hose, enough to pass thru the hood seal with gauge out for observation. If a longer hose isn't available, use it as is to at least determine actual pressures (at ignition on time and while idling).

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Old 09-03-2017, 08:19 PM   #7
Jonasan308
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1999 SC1
Default Re: Possible fuel filter issue

I borrowed a fuel pressure tester from autozone. They have 160 dollars of my money ransom. Haha.

I have a few questions. What is the normal fuel pressure range for my 1999? There are 2 bolts that apparently hold the filter to the car, what size are the bolts? And should i buy new bolts if the old ones too far gone in rust?

...
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Old 09-19-2017, 08:31 AM   #8
Saturn Night
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1995 SC2
Default Re: Possible fuel filter issue

Quote:
Originally Posted by Jonasan308 View Post
Ive been bedridden the last few days and the boredom made me think and look around on the net. Well. In the midst of that, i thought to look into my issue with that noise near the fuel filter. I found a site that had info about clogged fuel filters.
http://www.agcoauto.com/content/news/p2_articleid/219

According to the site, the clogged filter causes power losses, particularly when climbing hills. Also says that it can show up as a O2 sensor.

I went and had my codes read, and got back P0442 and the 02 sensor code (dont remember the numbers for that one)

In addition, im having the weak starts, and i do feel a loss in power when climbing hills. I thought the loss of power was something involving the valve body and it slipping, but it never went away after fixing the valve body.

And, i did find the source of the noise. The hissing noise is the fuel filter, and pressing on it changes the frequency of the noise. So, i suppose if say it is clogged, that a seal blew out somewhere and is causing the hissing.

It seems i forgot to ask how much renting a fuel pressure gauge would be at the store. I meant to ask but i forgot right away. Ill go back and rent it and check the pressure at various points.
I suppose i won't be able to look at pressure while driving right?
I actually have a fuel pressure test gauge. I have to be in Geauga County, around 3:15pm, today, to take a friend to get a Cat scan done. I have this weekend off, so I could always swing down to Akron with that gauge, if you really get jammed up. Running a fuel pressure test doesn't take but 5 minutes.

...
1991 Pontiac Grand Am @ 140k - More rust than paint & no leaks
1995 Saturn SC2 @ 181k - 17.2538 @ 77.91mph w/Stock TB
Mechanic: I can't fix stupid, but I can fix what stupid does.

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Old 09-19-2017, 08:36 AM   #9
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1995 SC2
Default Re: Possible fuel filter issue

Looking at all the posts, I suspect your fuel pump is on its way out, too. The fuel is a heat sink, in the tank. Also check your plugs. I was having similar symptoms and pulled my plugs to see high-speed glazing and rounded tips(indicative plugs are burning too-hot and due for replacement).

...
1991 Pontiac Grand Am @ 140k - More rust than paint & no leaks
1995 Saturn SC2 @ 181k - 17.2538 @ 77.91mph w/Stock TB
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Old 09-19-2017, 08:53 AM   #10
Jonasan308
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1999 SC1
Default Re: Possible fuel filter issue

I think illl need the gauge for more than a few minutes, thanks for the offer though.

I will check the plugs when the engine is cool again, if i was running lean, would it show up on the plugs as white?

...
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1999 Saturn SC1(This car is cursed)-156K at purchase(october 2016)-170k currently (jun 2017)

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Old 09-19-2017, 11:20 AM   #11
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1998 SC2
Default Re: Possible fuel filter issue

The major causes of either rich or lean mixture are fuel pressure, and/or exhaust leaks. If you do not set a 171-172 code then you are not running rich or lean as the system is correcting for your hidden failure. This is why you must know what the idle and cruise fuel trim is. Properly operating plugs in a NON OIL BURNING engine will shoe a gray shadow under the ground electrode on the center porcelain. If it is an oil burner you run the hottest plugs you can get away with.

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Old 09-23-2017, 07:59 AM   #12
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1995 SC2
Default Re: Possible fuel filter issue

Quote:
Originally Posted by Jonasan308 View Post
I think illl need the gauge for more than a few minutes, thanks for the offer though.

I will check the plugs when the engine is cool again, if i was running lean, would it show up on the plugs as white?
Lean conditions will show white plugs. High-speed glazing is slightly different. You are getting enough fuel, but it is burning so hot, that the deposits are actually creating a conductive coating on the tips/insulator of the plug, which wears out the plug and increases the gap

...
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Old 09-23-2017, 10:38 AM   #13
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1998 SC2
Default Re: Possible fuel filter issue

Present day fuel and minimal oil consumption will prevent those conductive glazing deposits, very rare these days to find it and with DIS it is instantly spotted.

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Old 10-02-2017, 08:25 PM   #14
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1995 SL
Default Re: Possible fuel filter issue

Just a wag. Have you tried replacing the TPS ?
I had one that seamed to be a fuel problem and
it was a bad TPS and the new one I bought on
line was also bad. Chevrolet dealer got me one
and it has been 100% ever since.

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