Vapor Lock
Race Director
Joined: Feb 2001
Posts: 11,288
Likes: 2,094
From: Grapevine Tx
2018 C3 of Year Finalist
2016 C3 of the Year Finalist
If you can drive it for 15 minutes and then it starts this, that's not vapor lock. Lars is right about the thermal heating problem. I put the sheet aluminum heat shield under my Holley (LT-1) and I also took the butterfly valve out of my exhaust heat riser and blocked off the exhaust passage through the intake manifold.
I was having a problem of driving the car somewhere and letting it sit for a while (summer time) and then when I came out and started to drive off it would run bad and quit until I could get some cooler gas into the carb. The ethanol will boil at a lower temp than gas.
I haven't had this problem since.
I was having a problem of driving the car somewhere and letting it sit for a while (summer time) and then when I came out and started to drive off it would run bad and quit until I could get some cooler gas into the carb. The ethanol will boil at a lower temp than gas.
I haven't had this problem since.
Thread Starter
Pro
Joined: Mar 2010
Posts: 615
Likes: 25
From: Graham NC
thank you, and wow. Last time was 15 minute drive and 2 prior times about 10 minutes. Twice the car went sour in same neighborhood and I had to limp home and miraciously made it before battery went dead from trying to restart so much. Next time I drive and when car goes car goes bad I’ll do more testing when engine is messing up. Always use non ethanol 93 octane. Thanks again
If you can drive it for 15 minutes and then it starts this, that's not vapor lock. Lars is right about the thermal heating problem. I put the sheet aluminum heat shield under my Holley (LT-1) and I also took the butterfly valve out of my exhaust heat riser and blocked off the exhaust passage through the intake manifold.
I was having a problem of driving the car somewhere and letting it sit for a while (summer time) and then when I came out and started to drive off it would run bad and quit until I could get some cooler gas into the carb. The ethanol will boil at a lower temp than gas.
I haven't had this problem since.
I was having a problem of driving the car somewhere and letting it sit for a while (summer time) and then when I came out and started to drive off it would run bad and quit until I could get some cooler gas into the carb. The ethanol will boil at a lower temp than gas.
I haven't had this problem since.
