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If I park my 95 Seville SLS and let it sit over night, the next morning I will have less gas(according to both the gauge and the range meter). Also when I start it, i get a real bad "exaust" smell and it stumbles for a quick second. So could this be a leaking fuel injector or something else? And no, no one is using an Oklahoma credit card on me, my Rottwieler makes sure of that:want: .
 

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To visibly notice a lower reading on your fuel gauge, you'd have to be losing a considerable amount of fuel via a leak somewhere, don't you think? I have to think there would be a very strong odor of unburnt fuel at all times due to the fact that the fuel system is pressurized. Can you smell fuel when the car is off? If not, I'd manually check your mpg over the next couple of tankfulls to see if mileage is consistent. I'd bet on a faulty fuel level sensor before a fuel leak if there is no odor. If there is some odor, I'd check the FPR to see if it needs replacement.

At start-up, the stumbling could be many things. Is there any visible smoke at your exhaust tips under start-up. Excessive white smoke during the 'stumbling' would be bad, as you might be burning some accumulated coolant due to a leaking head gasket. Excess fuel in the cylinder(s) should cause a uniquely noticeable smell in the exhaust, but the presence of coolant isn't a normal smell either. If you don't have these conditions, I'd suspect your problem is electronic. Pull codes and see if the car is trying to tell you what's wrong before you do anything else. Good luck!
 

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You've got a fuel leak - and will have to be very careful finding it - it's true that the fuel system is pressurized the whole time the engine is running - BUT - when you shut off the car there is residual pressure in the system - apparently it's found an "out" and is bleeding itself off when your ignition is turned off.

Run the car for a bit (not long) - with the hood open and NO SMOKING NEIGHBORS nearby (while they will help pinpoint the leak, the results are not favorable to getting the car back in order - trust me - I know this - feel free to ask why/how but it should be self evident) - you're gonna need to use a good flashlight and just check all over the place for "wet spots" - there's a good chance that you'll see gas leaking if you look really close -

Since gas evaporates pretty quick you're probably not seeing the puddle when you start your car up in the mornings - but it's gotta be there somewhere - a likely candidate would be the return fuel line - fuel injection systems provide enough pressure to accomodate WOT operation - obviously you're not ALWAYS hard on the throttle so there's a return line to send the unused gas back to the tank - that's probably where I'd start looking.

Best of luck - and again - no smoking or open flames - in point of fact I'd keep a fire extinguisher handy while searching for the leak - just in case - and I'd be very disinclined to crawl under the vehicle (always the chance for making a spark at an inappropriate moment) - I'd either put it on ramps or borrow a friendly mechanics lift somewhere -

Steve
 

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JC316 said:
If I park my 95 Seville SLS and let it sit over night, the next morning I will have less gas(according to both the gauge and the range meter). Also when I start it, i get a real bad "exaust" smell and it stumbles for a quick second. So could this be a leaking fuel injector or something else? And no, no one is using an Oklahoma credit card on me, my Rottwieler makes sure of that:want: .
It really sounds like you have a badly-leaking fuel pressure regulator. Pull the vacuum hose off of it and look for fuel. If you see anything liquid from it, it's in need of replacement. They're about $50 and you can replace it yourself in about 5 minutes. A $tealer$hip will kick you in the teeth for about $300 to do the exact same job. Do yourself a favor and order it from www.gmpartsdirect.com or www.rockauto.com and do it yourself.

If the FPR tests fine, you may have a leaking fuel rail. Your car has a recall to replace the nylon fuel rail with a stainless steel one for just exactly this reason. If you see fuel around the rail, then you can call the $tealer$hip. The recall work is done free of charge. Don't let them talk you into other work while you're there.

Let us know what you find. We'll help you sort it out.
 

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I had the problem of leaking gas on both my 88 Buick Century and my 89 Deville.

It was rotted fuel line under the rear driverside door/seat area. I cut the old steel line that was rusted where the hole was out, with a hacksaw blade and replaced the section with the flexible fuel line from the parts store.

good luck! hopefully yours will be as simple!
 

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JC316 said:
If I park my 95 Seville SLS and let it sit over night, the next morning I will have less gas(according to both the gauge and the range meter). Also when I start it, i get a real bad "exaust" smell and it stumbles for a quick second. So could this be a leaking fuel injector or something else? And no, no one is using an Oklahoma credit card on me, my Rottwieler makes sure of that:want: .
Pulling your car into the garage to leave it over night with the tank showing 16 gallons and XXX miles to empty then waking in the morning to find 15 gallons and YYY miles to empy is not unusual. Anything more than one gallon suggests a leak.
 

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I would highly doubt that it is a FPR or an injector. The system will loose pressure and stop leaking long before it will leak enough to show up on the fuel guage. You have a major leak somewhere, tank, line, filter.
 

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Discussion Starter #12
Thanks for the replies. I will be checking my car over tomorrow. I live in the country, so it may be possible that I am parking on uneven ground and it is screwing the gauge up. I will post anything I find tomorrow.
 

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JC316 said:
Thanks for the replies. I will be checking my car over tomorrow. I live in the country, so it may be possible that I am parking on uneven ground and it is screwing the gauge up. I will post anything I find tomorrow.
Sometimes I wonder just accurate the guage really is. Years ago a buddy bought a new Buick Grand National with the digital guages. We went to the store and the car wouln't start when we came back out. My buddy couldn't believe that the car simply was out of fuel. He kept telling the tow truck driver that the guage showed four gallons when we stopped.
 

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I had Olds 98 that had rotted fuel line. Start car, and look underneath for leaks. Also, with gas prices so high... Gas theft might be happening?
 

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Discussion Starter #15
Well, I checked the car over and I can't smell or see any leaks. I am parking it on a level surface tonight and see if it makes a difference. I am positive that I am not getting my gas stolen. I have a fence around my property and a VERY large dog that stays out all night.
 
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