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04-08-2004, 10:27 AM
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Too Much Fuel Pressure 350
I have a 350chev, Holley 650DP, stock fuel lines 5/16", stock fuel pump. When testing my fuel pressure at idle, i get a guage reading of 9.5psi. Is this too high to run without a regulator of some sort? Would it cause rich running?
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04-08-2004, 12:09 PM
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Yea.
Thats to hi. Get a regulator and adjust it to around 5psi or so. HG
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04-08-2004, 12:27 PM
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If the stock pump is putting out 9 pounds, i'd replace the pump before installing a regulator. Pump is around $10 at Napa. Most stock GM sbc pumps run about 5 1/2 to 6 pounds. Must have a bad relief spring in it.
My name is Mark Jacobsen and I approve of this post. 
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04-09-2004, 09:53 AM
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Thanks for your advice guys. Will swap the pump and get a regulator to cover all areas. But i might get another fuel pressure guage. I have a holley guage, but for some reason I don't trust it. The fuel pressure pulsates from 9 odd to about 9 1/2. Does it pulsate normally? The idle fluctuates in my car as i have a rough idling cam, so i thought that could cause the fluctuation. But either way, i'll try another guage.
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