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GMC V6 and V12 Engines Engine repair and rebuilding

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  #21  
Old May 17th, 2019, 10:42 PM
jerrspud jerrspud is offline
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Default Re: 305e Holley 500 swap question

wow.. thanks guys... I appreciate the info!

I got my 56 with a 4 barrel holley running again and once I get that one tuned, I'll have a better idea how to tune the truck and get the carb dialed in. I'm trying to get as much info as I can to help others as well because there isn't much info on the swap besides some the one page on this site.
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  #22  
Old Yesterday, 09:07 PM
jerrspud jerrspud is offline
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Default Re: 305e Holley 500 swap question

so I'm making progress. I discovered a new problem. I have bubbles in my fuel line. I noticed that when I pulled the sight plug and there was no fuel coming out no matter how much I turned it out.

So my guess is the line to the sending unit is not sealed,but I'll check the whole system. Besides that major issue... she idles great.
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  #23  
Old Yesterday, 11:24 PM
James James is offline
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Default Re: 305e Holley 500 swap question

I had a similar problem with air getting in the line. When it happen I could not get the fuel pump to prime, once I did it would run. What I had found is the new fuel sending unit has a fitting solder to the line. Well it didn't look right but I thought it was just me. I turn out the fitting had back off of the line just enough during manufacturing it had allow air between the fitting and the line. I solder it back on in it proper position and the rest is history.

Here is the thread from FetchMeAPepsi
https://6066gmcclub.com/showthread.php?t=47321&page=58
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  #24  
Old Yesterday, 11:25 PM
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FetchMeAPepsi FetchMeAPepsi is offline
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Default Re: 305e Holley 500 swap question

If you have air in the line, you might have to prime it to the pump to get it flowing again. I tied a tube to my fuel funnel and then tied that into my steel line coming up from my undercarriage to my fuel filter. So it went funnel, tube, steel line under the truck, under cab fuel filter (pass side), fuel tank. Hold the funnel up high and fill it about 5 or six times so it fills the entire line, then take it loose and hook it back up to the pump. Prime the carb and boom, off you go.

If it's sat without gas for awhile the seals dry out and leak air. If you get them wet with gas again they usually seal right back up.


Edit: Haha, James beat me to it! He's a quick one!
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