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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old October 14th, 2016, 06:50 AM
GBCustoms GBCustoms is offline
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Default Is Electric Fuel Pump Necessary with Holley 500?

Hey guys, can the stock mechanical fuel pump on my 351E keep up with the Holley 500? The PO put a spare Holley he had lying around the shop on it, but never got to test it. I am hoping to get my spark issues lined out this weekend and start this beast up. Should I go ahead and plan on upgrading the fuel pump too?
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Old October 14th, 2016, 01:28 PM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

The stock fuel pump will keep up with the holley just fine. You don't need an electric unless you just prefer it.
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Old October 14th, 2016, 03:00 PM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

The recommended pressure is 5-7 for the Holley, so like Fetch stated, you should be fine.
I kept having new fuel pumps go bad on me (maybe shelf stock was too old?) so I went electric.
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Old October 14th, 2016, 03:13 PM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

I prefer electric, but the stock should hold up.
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Old October 18th, 2016, 03:57 PM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

Awesome! Thanks guys. I wasn't getting any fuel and the pump looks rather new. So of course I take the pump off, manualyl pump the lever and can feel the suction on the line.Check the lines, They are Clear. Check fuel level in the tank, Plenty. Why no fuel? So I finally use my brain and start with the simplest answer. The PO had the fuel lines reversed on the pump. I'm an Idiot!
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Old December 18th, 2016, 12:10 AM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

Actually.... I think you just pointed out that the PO was the idiot and you fixed his mistake!
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Old December 18th, 2016, 12:51 AM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

I've been there done that!
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Old December 18th, 2016, 01:28 AM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

Quote:
Originally Posted by GBCustoms View Post
Awesome! Thanks guys. I wasn't getting any fuel and the pump looks rather new. So of course I take the pump off, manualyl pump the lever and can feel the suction on the line.Check the lines, They are Clear. Check fuel level in the tank, Plenty. Why no fuel? So I finally use my brain and start with the simplest answer. The PO had the fuel lines reversed on the pump. I'm an Idiot!
So does the stock pump keep up?
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Old February 8th, 2017, 04:12 PM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

sorry for the late reply! Haven't had it on the road yet, but it keeps up just fine when i am running the motor sitting still.
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Old February 9th, 2017, 12:58 AM
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Default Re: Is Electric Fuel Pump Necessary with Holley 500?

If your float is set right, and your pump is good you won't have any problems. Dave
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