Rattling noise from under car

Good day guys, I have a 71 Swinger and I’m hearing a pump/rattle sound on my passenger side under the car. It sounds like it’s coming from under the passenger floor pan. I’ve checked my pump stops and they are all intact. Any help or has anyone had this problem and figured it out? I’ve attached a picture of my car

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It only happens when I hit a bump or pot hole in the road.