2001 Volvo S60 Smell of gas

It sounds like you have a gas leak somewhere. Have you noticed any small puddles under your car or drips. They will disipate after a couple of hours so checking in the morning will not work.

A fuel pump can cause the hard to start problem, but it will not cause you to smell gas. I do not know for certain on your car but the pump on most cars is in the tank. A fuel filter can cause the problem, but again you will not smell gas. The place to check is along the steel fuel lines under your car. There will be two thicker lines one a return line and one a supply the supply will have the fuel filter in it. The fuel filter is a small cylinder with a line in and a line out. There will also be thinner lines. These are brake lines. Look for rust on the lines. If you find a spot that is rusted, and looks wet you have probably found your leak.

You need to start a new question, and PLEASE! List the engine size and mileage. This was a conversation between just two people, and your addition is not going to be seen by any of the other experts. They won't have a chance to reply. That does you a disservice.

Excessive gas in the engine oil is typically caused by a leaking injector or a spark-related misfire. The fuel supply system should hold pressure for many days after the engine is stopped. If an injector is leaking, the fuel can run into a cylinder, then past the piston rings and into the oil. The clue is there will be an uncommonly-long crank time before the engine starts and runs.

With a misfire, the unburned fuel mostly goes out the exhaust, but the misfire should be detected, a diagnostic fault code would be set, and the Check Engine light would be on or flashing. What little gas managed to sneak into the oil would likely vaporize and be draw out and burned as fast as it got in. The exception is if you do a lot of short-trip driving. The cold oil will make it harder for the gas to vaporize, so it will condense and stay in the oil.