Can hauling gas for a living cause not being able to get pregnant?

It is an improbability that you fiance developed infertility from hauling gas or exposurer to gas. The Hydrocarbons from the gasoline causes effects to the lungs, stomach, and air passages. Your doctor can run tests to help determine the cause and effects of his infertility.
The National Poison Control Center (1-800-222-1222) can be called from anywhere in the United States.

It would not be from the exposure to gas, however, if he is driving an 18 wheeler and is jostled around alot, then that could affect his motility, but even that is highly unlikely. You have a greater chance of it being stress related than because of his job. Sometimes if you try too hard, or too often, that can reduce your chances. Have him talk to his doctor. They can test his motility and count to see if that is the problem. Also, they can run tests on you as well, because in very rare cases some women have what doctors term an allergic reaction to sperm. This does not mean that they are really allergic but that their body puts out a chemical that kills the sperm. You should also see an OB/Gyn as it could be something physical that they can help you with. It may be as simple as you just need to get an ovulation kit. Good luck to you both, Susu

It's not the gas it is because he sit's on a hot seat all day long sperm has to have a lower temp than body temp get him to keep his self cooler down ther in the lower spot. All dr.s will tell you that a truck driver has a lower sperm count!