Something weird happens while filling up....
Thread Starter
Staging Lane
Joined: Mar 2010
Posts: 90
Likes: 0
From: Lexington, KY
Something weird happens while filling up.... While leaning against my car about a month ago while filling up I noticed that right before the pump turned off my car suddenly dropped about a half of an inch maybe a little more. I thought someone walked up and pushed on the car but there was no one there. Tonight I saw it physically drop about a half an inch. I am sure its due to the weight of the gas but does this mean I am having issues with my shocks? Should I see the back end drop?
Trending Topics
Thread Starter
Staging Lane
Joined: Mar 2010
Posts: 90
Likes: 0
From: Lexington, KY
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Mine does the same. Seemsvit gets so many gallons then drops, it's not a slow settle, you can physically see/feel it drop every few gallons. It's kinda weird andvfreaked me out a little when I first got it. It did with the stock and lowering springs.
TECH Regular
Joined: Nov 2009
Posts: 446
Likes: 0
From: Farmington Hills, MI
I feel the same thing. There actually is an engineering term for what you are feeling: stiction. Static friction coefficients are generally higher than dynamic (viscous in this case) friction coefficients. Once you overcome the stiction of the seal between the two cylinders, you can feel the viscous friction take over.
The seal flops in the direction it is being dragged if there is enough force (visualize the windshield wiper dragging back and forth and how it flips over during the direction change). If you lift the car up and then down right before you fill up, which will flip the seal so it is sliding and not dragging, you might not even notice it happening. I'm going to have to experiment some myself...
The seal flops in the direction it is being dragged if there is enough force (visualize the windshield wiper dragging back and forth and how it flips over during the direction change). If you lift the car up and then down right before you fill up, which will flip the seal so it is sliding and not dragging, you might not even notice it happening. I'm going to have to experiment some myself...