It has been very cold and sometimes when i warm it up the heat smells like raw gasoline. last few trips to town the car has sometimes done the acting like its out of gas feeling. (gas tank full) someone told me maybe a stuck vent from condensation and to put some heet in the tank. i put the heet in - went to town still the same and today the check engine light came on? oil is new thermostat good and air filter cleaned two weeks ago?
Re: acts like its running out of gas, raw gas smell
Sounds like it could be a leak under the hood. Have someone cycle the key on and off while you look around the engine compartment for a leak. Paying close attention to the fuel rails and lines. If you don't find any leaks by cycling the key start the engine and look. Be careful gas leaks in the engine compartment can be dangerous.
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Re: acts like its running out of gas, raw gas smell
This suggests you have a fuel leak in the engine compartment. Possibly a leaking fuel manifold (injection rail), or the rubber line from the fuel tank is leaking where it attaches to the manifold. The fuel line to the cold start injector should also be checked. Rubber hoses on older cars become brittle and as they contract from very cold weather will leak. Turn the key to on for 1 minute but do not start the car. Then check under the hood for a raw fuel wet spot where the leak is.
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if it smells like raw, unburned fuel, you may have an injector stuck open. i assume it clears up and drive good after a short warm up. there will be evidence of which cylinder has the bad injector by pulling out the spark plugs. the affected cylinder will be washed clean and smell like unburned fuel. the plug may also be "wet black" and of course smell like raw fuel.
Was this the smell of burnt fuel or raw gasoline? If this started after it began getting cold outside this can indicate a problem with the EVAP system in the car. This may or may not cause a check engine light.
This site reported a 2010 model of your car having this same symptom. They found the injector seals to be leaking. http://www.truedelta.com/Jaguar-XF/engine-problems-808 supercharged 510hp 5.0L V8 6-speed shiftable automatic RWD Mar
injector seal leak causing "gas" smell in cabin - replaced injector and new seal kits on other injectors
That can be a very serious issue with the potential to cause a fire. I would have it checked by a professional mechanic and specify your concern on the injector seals being checked.
You rubbed through the fuel tank or cracked it and it has a small leak. They make a fuel tank repair kit you can by a a auto parts store some times they work and sometimes they don't. If gas is spraying or leaking on the exhaust you could have a fire. I have drained a tank and put a screw with a fiber washer in the hole and then covered it with a 1/2 inch if silicone rubber it lasted for 5 years. Your fuel lines and filter are usually up on the side of the frame and should be ok
If it is running fine, the busted bolt isn't the source of the gasoline smell. The intake manifold has vacuum, so the smell wouldn't be getting out, air would be going in, and a vacuum leak would give you poor idling. The exhaust manifold wouldn't have much raw gasoline smell. But it would have loud noise if the broken bolt were causing an exhaust leak.
Check that the vapor recovery line is not broken or disconnected. The hose connectors get cracked. If that were broken, it would cause a gasoline smell after the car has been sitting, especially if it has been sitting in the sun, heat driving gasoline vapor out of the tank. It is supposed to condense in the vapor canister, but some escapes if the line is broken. If it is broken, driving would **** out the gasoline from the line and the wind would dissipate the smell.
Or it could be a leaking injector. With the injector cover off, engine idling and cool, you can visually look for raw gas around the injectors and injector rail connections.
This should show up easily on the ECU diagnostics computer at a mercedes dealership. Basically your fuel mixture is way too rich causing your car to be heavy on gas, have a raw gasoline smell, and not run right. Something like this can be caused by a defective oxygen sensor (but that usually produces a check engine light) or it might even be a defective ECU. There is really not way of knowing for sure until you do a proper diagnostics where they hook up your exhaust at the same time and do an emmission test. In most cases it's some sensor that needs replacing.