![]() Sethmast is obviously having a major problem probably from the fuel line from the pump touching the block, etc. Newer cars running electric pumps aren't as affected.Ĭurrently I am tossing around several fixes in my mind, Carter electric fuel pump, Ram Air manifold with NO crossover but a homemade block off plate out of cast or steel, perhaps both. Big oil is not always following the rules about the % but even 5-10% will make a huge difference in how much sooner at lower temps fuel will vaporize, higher altitudes with increase vapor lock too. Over the past several years this problem has gotten worse and I believe it's due to the increased use of Ethanol. OK interesting subject and I've been looking into it because over the years it seems my FB gets vapor lock sooner, generally what happens to me is when it was hot out, 85F and up when I stopped somewhere the fuel would boil off and I would have a hard start, generally typical Pontiac issue beause the fuel does get hotter due to the longer line going around the block and then out the fuel pump up the front of the engine, the fuel line on Pontiac V8s is exposed to more heat, add to that the stupid exhaust crossover in the intake and you're vaporizing the fuel. Would a carb spacer or carb heat shield also help?Īny other suggestions would be appreciated. ![]() I'm going to look to see the route of the fuel lines to see that the lines is run the proper route to eliminate the possibility of the lines being too close to the motor, and being exposed to too much heat. I'm not sure it was bubbling because it was hot already, or because it was puddling on a hot manifold.Īnyway, I was wondering if the fuel is typically hot when its pumped from the tank to the motor. The fuel line had pressure to it, since the fuel came spitting out, but I notice it was very hot, and as it spilt onto the manifold, it was bubbling. I wanted to see if the fuel was flowing, and it was. So I unhooked the fuel line at the filter, between the metal fuel line and the metal lines going to the carb. Looking through the little window of the carb, I didn't see any fuel in the primaries. ![]() Thankfully, I've been able to coast a good distance and change lanes until I can get it stopped on the shoulder of the road. I've had the car out twice this spring and each time after running the car for about 20 minutes, it starts hesitating and bucking. ![]() I think my bird is suffering from vapor lock. ![]()
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March 2023
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