First the details- 57 Chevy pick up with 327 (four barrel summit racing carb) mated to a TH350 transmission. Every time I get the truck on the road I run into the following: It runs like a bat out of hell for about 2-3 miles. Then it acts like it's gas starved when you try to drive, but will idle with no problems. I have plenty of gas in the tank, and when I look at the filter, it is full of gas as well. The hose running hot water to the heater is directly under the fuel inlet, so I'm wondering if vapor lock might be the issue. Any ideas what the issue might be?
How big is your fuel line ? Can you put a fuel Pressure guage inline where you can read it? like out side the windshield? Are your floats adjusted correctly What kind of pump are you runnin?
Take it for a drive with the fuel cap off and see if it still gives trouble. Might be a problem with the tank vent.
What size fuel lines? What about the pickup in the tank? Is there **** in the tank that clogs the intake sock only during high suction events? If you have not removed the tank and cleaned it out that should be done next. Can your fuel pump keep up with the engines demand? The symptoms are cl***ic fuel supply can't keep up with the engine demand. Looking at the fuel filter after the event tells you nothing as it will be refilled by the fuel pump as soon as high demand goes away.
actually, I had a vent problem, and between power loss at higher rpm, and engine runnin like **** after it initially fell on its face, My issue was the fuel tank vent, and my filter was empty..... The tank was getting ****ed in, and created a vacuum. His filter is full, so its getting fuel, perhaps not enough? The Summit carbs are notorious for debri from casting in them, like preform. If its the Summit version of the 4110 it has a screen filter that could be plugged as well
Do you have a long piece of rubber fuel line?sometimes when the rubber gets hot they tend to **** shut
I bet it is. Get some tin foil and wad all the lines anywhere near heat sources, then road test it. If it gets any better, you are on the right track, and might have to put a heat spacer under the carb as well. If you have a mechanical fuel pump, try a cheapie electric if you get most of the problem gone. The gas today is not carb friendly. The antique car guys run a bit of diesel fuel mix, but I have never tried it. they swear by it.
Been a while since I could work on the truck, seems the tank vent was the culprit. Thanks for the advice.
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