How to use fume hoods? - Labconco Fume Hood

There are a couple of things to consider...

First the cabin air intake is generally in a tray that once the engine compartment hood or bonnet is closed should be almost completely isolated from the engine compartment due to the rubber sealing strip and other rubber components. Perhaps some of these are missing or in poor condition. If heater intake water drains are fitted they should be self closing...

In good condition normal smells or fumes should not get past those seals.

The other consideration is where are the fumes coming from? Unless the engine has an exhaust or oil leak or a breather problem the amount of fumes generated to leak into the cabin, even if the sealing isn't in good order, should be minimal.

time for a mechanic asap
to many things happening under the hood to answer correctly
needs a tune up .. maybe plugs ,leads ,?
you cant have exhaust fumes inside the car

Depends where you are of course. In the USA try this company, from Kansas City. They have an online design tool.

http://www.labconco.com/
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Since there's very little information to go on, I'll guess...

Guessing it is a car or truck.

Guessing you have an exhaust leak under the hood.

Guessing the air intakes for heat are picking some of that up.

Bad trunk or hatch seals can also let exhaust fumes get in the cabin area.

I emphasize with you on this problem. If you are smelling fumes you are inhaling car "exhaust" which is extremely dangerous as you know. I have a 1999 Passat that had a "fume" issue that baffled me for over a year. Your description of the conditions that you smell the fumes may not be complete enough for me to definitively say what your problem is but I will tell you what I experienced and discovered on my car. I only smelled the fumes when my heat or AC was on and the car was NOT moving forward. Also, if the AC recirculate button was on I didn't smell the problem as bad. So, what I found was that the car's emission control piping was leaking the exhaust fumes that bypass the pistons and go into the crankcase. These fumes are normally piped back into the intake manifold to be re-burned to reduce emissions. With a completed disintegrated rubber emissions pipe coming off the engine block, the fumes entered into the engine compartment which is sealed from the interior of the car. So, how did the fumes get in my car? Well, when waiting at a red light and with the heat or AC on (no recirculate) the fumes would fill the engine compartment and overflow out the wheel wells and wrap over the hood to the intake vents (near the wiper blades) of the car's interior air system. If the recirculate button is pressed with the AC on, the car's interior air (no exterior air) is recirculated inside the car to cool it faster and I didn't smell the fumes as bad. Also on windy days the fumes didn't get a chance to wrap over the hood and get into the intake vents. Because of the unique conditions that had to occur in order to smell or not smell the fumes it was a difficult problem to solve. By the way, the disintegrated rubber pipe was almost impossible to see and there is no real reference material to read that describes the location and depiction of the emissions plumbing. I hope this helps you!

My suggestion is to make sure there's no oil spilled from putting any in. Take it to a car wash leave engine ON stay away from fuse box and battery tray. Use the engine degreaser mode and wash your engine rinse thoroughly with the rinse mode after. If the problem still occurs. Check to see around top of motor if any smoke is coming out or if fluid is coming from valve cover. If so replace the valve cover gasket which is usually cheap.

Well, exhaust fumes are a normal thing. If you feel that something is leaking where it should not be, take a short section of heater hose( 2 or 3 feet), run the unit, place one end to your ear, and listen around the unit. There is no emission converter on lawn mowers, so fumes can be inhaled...

if you are driving in the open and you have your hood down it would be unlikely for fumes to come out and stay in the car. if your hood is up check your exhaust pipes

if that was the code for the purge vent solenoid i would say it is bad since you smell fumes. because that solenoid allows the vacuume from the engine while it is running to pull the excess fumes from the fuel tank and burn them off inside the engine. also might want to check lines under the hood associated with the solenoid to make sure excess air pressure from the fumes building up didn't blow a vac. line off. i would also check the condition of your fuel cap, if it doesn't seal good it could also cause a similar problem.