Fuel Filter replacement and guel mileage - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-28-2005, 03:07 PM   #1
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Default Fuel Filter replacement and guel mileage

HI.

I changed out my fuel filter yesterday. It wasn't where the filter maker said it was (left side of car by rear seat); rather it was inside the engine compartment on the passenger side down by the firewall.

I checked here to see if anyone else had done a similar changeout. One guy had, and he even posted pictures. Unfortunately for me, he didn't give any location information, and rusty stuff on the bottom of a car looks pretty much the same all over the car. His also had threaded couplers where mine (thankfully) had plastic quick connects on both ends.

Once I found the darned thing, it was about a half hour job. I didn't find the fuel pump fuse/breaker to relieve the pressure, but I did get my son to loosen the gas cap to relieve the pressure. I only got a LITTLE bit of gas in the face this time.:)

I changed it out, and the air filter last week, because someone here suggested those as quick easy ways to kick up the fuel mileage a bit. I'd rather pay the parts store once than the gas station every week.

Also, someone said the ethanol mix gas gives lower mileage than 100% gasoline. If that'* right, how big a mileage boost should I hope for if I go to the 100% stuff? I'm now getting about 20mpg on a 20 mile round trip, about 50/50 surface/highway. At $2.50 a gallon, one mile per gallon improvement would cover the extra cost of the higher priced stuff.

Thanks for all your help over the last few years. I'm right at the 80K mark, and figure it'* about time to change out the belts. I have to jack up the engine and take off the engine (or is it the tranny) mount to be able to get the belt off and then on, right? Should I swap out the mount(*) while I've got the engine disconnected, or is it not that big a deal to do it and I can wait on it. They don't look to be in bad shape; the one I saw up close yesterday was only a little bulgy on the sides and still filled the metal part, so it'* not a right away job. I hope.
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Old 08-28-2005, 03:20 PM   #2
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Your motor mounts should be fine....I got 208K on mine. The belts, yest you have to disconnect the one motor mount going to the passenger side of the car. That will allow you to remove and install the belts.
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Old 08-28-2005, 08:47 PM   #3
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You are talking about my pictures. I am pretty sure all of the H-Bodies had the fuel filter where mine was, which is about one foot infront of the RR tire. I wonder why yours is in a different location?

Glad you did find it though and the swap went well. Many people on here have done the swap, I am just the only one that wanted to make sure they knew exactly what they were doing before doing it.
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Old 08-28-2005, 08:59 PM   #4
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No no no, you do NOT have to do anything with motor mounts to change the belt on a Series I. That'* Series II.

I've gone back and forth between 10% ethanol and normal in my 92 SSE, and I've never seen a mileage change either way associated with ethanol.

Rock Island? I'm in Galesburg.
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Old 08-28-2005, 09:48 PM   #5
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Well howdy hey! We're drag racing in Cordova this Friday!

[/end hijack]
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Old 08-28-2005, 10:34 PM   #6
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It'* a myth that a fuel filter can affect mileage. It cannot. It can only affect PERFORMANCE. Big difference.

It also takes a SEVERELY clogged air filter to affect mileage.

Biggest hits on mileage are plugs/wires/coils and O2 sensor.
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Old 08-28-2005, 10:37 PM   #7
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the Fuel Filter for the 93'* is right underneath the pass footwell...on the 94'* and laters its right infront of the rear tire
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Old 08-29-2005, 01:00 AM   #8
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Quote:
Originally Posted by willwren
It'* a myth that a fuel filter can affect mileage. It cannot. It can only affect PERFORMANCE. Big difference.

It also takes a SEVERELY clogged air filter to affect mileage.

Biggest hits on mileage are plugs/wires/coils and O2 sensor.
[b][i]

I'll find out about the performance in the morning on my way to work. <G> The air filter was just dirty enough that I couldn't see through it. I think it was a year or two old. Plugs and wires were changed the summer before. Maybe it was an extra summer on both those jobs. I don't think it could have been two more years.

Coils I don't know about. Is there a way to check their performance in the car?

O2 sensor was changed at about 50K miles. I put in a BOSCH because it'* been a good name in the past. VW and Porsche use their stuff, so it can't all be bad. I'd like to get back the performance I once had. It used to really jump when you kicked the gas pedal, and I liked that. I've heard BOSCH kinda bad-rapped here. Would the DELCO make that big a difference at this stage of the game?

I'll not likely make it to Cordova, but I'll not rule it out. I get to Galesburg every few months. Maybe I'll drop a line when I head that way again.

As for the Bonny bro from Ames; my other half worked in the burn unit there some 30 years ago. I hope you never had to be her patient. Burns are so very doggone painful.
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Old 08-29-2005, 01:03 AM   #9
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Get the Bosch O2 sensor out of your car and replace it with an AC Delco sensor ONLY. Bosch sensors are notoriously flaky in our cars. Most fail or give bad readings within 30 days.

There'* your problem.
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Old 08-29-2005, 01:03 AM   #10
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Anytime. I've only met one BC member as of yet, and that was just last week.

I've only used a Bosch O2 sensor for 6 months before it crapped out. Put an ACDelco in over three years ago and it'* been fine ever since.
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