I was wondering the same thing. I’m still using the stock vent tube which has only a 1/8” ID. Would it be as simple as switching to a bigger tube or do I need something more?
Greg could very well be right too, but I do think you vent is really small for such a high volume of fuel moving. I'd have a pressure gauge on the engine to make sure it's dropping off at the same time to rule out anything else. If the pressure is down when you lose power, unscrew the gas cap and see if the tank is under vacuum and your fuel pressure should come back quickly. That small vent may be overheating that pump pre-maturely so it may need to cool down. You could always drive the car with the cap loose and take it slow. That will add some venting and simulate a bigger vent. I'm with Greg, I've always heard you need a controller on that pump or they overheat within 60-90 minutes.
Brian Hobaugh SCCA National Tour June 2014
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