Raw fuel smell

[Bowtied13]

Hey guys I'm new on the forum, I was just a lurker for quite a while. So hopefully I'm doing this right. Here's a picture of my truck. It's a 1984 C10 Silverado, sb350 with a 700R4.

Over the last while when I drive my truck it smells like raw fuel really strong in the cab. I could never pinpoint where it was coming from. Well today I jumped in the truck to go somewhere. Before I started it I depressed the brake pedal, as I did it made a hissing noise (like air leaking) and suddenly I was hit with a pretty strong smell of fuel. I took my foot off and did it again. Same thing happened. It's been happening for a long time but I just now was able to connect it with the brake pedal.

I don't know if it's some sort of vacuum leak with the brake booster or something. Has anybody experienced anything like that?