Guest Anonymous Posted April 10, 2003 Share Posted April 10, 2003 ok here's the story, I was driving my car and ran out of gas. Now it doesn't perform as well as it used to, it is significantly slower. I've checked the fuel pump and changed the fuel filter, same slow car. What could it be? I have a sbc 350 with a 650 dp holley. Quote Link to comment Share on other sites More sharing options...
denny411 Posted April 10, 2003 Share Posted April 10, 2003 the pickup screen in the tank could be plugged. Quote Link to comment Share on other sites More sharing options...
Guest greimann Posted April 10, 2003 Share Posted April 10, 2003 If it was an electric fuel pump, it is probably fried. Electric pumps should NEVER be run dry. Not even for several seconds. Quote Link to comment Share on other sites More sharing options...
denny411 Posted April 10, 2003 Share Posted April 10, 2003 as a rule, you should keep at least a 1/4 tank in cars w/ electric pumps in the tank. frequently running below this will overheat the pump. In tank pumps are cooled by the fuel washing around them. Have you ever wondered how those little electric motors can pump contiuously for 100,000+ miles? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted April 10, 2003 Share Posted April 10, 2003 i've changed the fuel pump and that hasn't solved the problem. any other ideas? Quote Link to comment Share on other sites More sharing options...
Guest mtbrider586 Posted December 2, 2004 Share Posted December 2, 2004 Did it back fire up the carb when it ran out of fuel. if it did you might have blown the power valve in the carb. Quote Link to comment Share on other sites More sharing options...
Guest tony78_280z Posted December 2, 2004 Share Posted December 2, 2004 Yup, power valve. Holley claims their new power valves have eliminanted this blow out problem with some kind of "Blow Out Protection". Not sure what that consists of. But if you got a good backfire on one of these older power valves it could very well be the problem. This is a good webpage for information on Holley Carbs http://www.bob2000.com/carb.htm On it the guy describes the following... Blown Power Valve :You may notice a bad power valve because you will not see the jump from lean to rich when your vacuum gauge gets to the power valve setting. You will see a rich mixture at cruise, when the power valve should be closed. You may also notice a badly BLOWN power valve as an overly rich condition at idle. This occurs only if the diaphragm has a big hole in it that lets fuel from the float bowl into the power valve vacuum passage and into the engine. There are some hand held vacuum pumps and adapters out there to check power valves. I just use my mouth after making sure all the gas is dried off. If you suck a lot of air through the diaphragm, or it won't hold a vacuum, then replace it. Hope this helps -Tony Quote Link to comment Share on other sites More sharing options...
BrandonsZ Posted December 2, 2004 Share Posted December 2, 2004 Once again, your problem lies in the fact you are relying on a ford part (holley) to run a chevy engine (sbc350), they fight spiritually. Happens all the time, no harm, just replace that bad boy with an Edlebrock or Q-jet. Glad I could help. Quote Link to comment Share on other sites More sharing options...
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