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GMC V6 and V12 Engines Engine repair and rebuilding |
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#21
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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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Jerr 1963 305 V6 1500 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#22
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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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Jerr 1963 305 V6 1500 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#23
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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 |
#24
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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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Step by steps: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Some people are like slinkys. Not worth much but funny as heck when pushed down stairs. __________________ If the women don't find you handsome, they should at least find you handy. |
#25
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On all my vehicles I usually start a folder with information I gather over time from forums or experience. Since we are talking about the Holley 2300 series of carburetor here is the number for the fitting that adapts the original fitting from the stock carb fuel line to the Holley. Fitting to fit Holley 2300 series carburetor for fuel, inverted flare to pipe, BQ248.
One other thing, on my hard to start Willys car after sitting for a long time, starting became really easy after I installed a check valve from Summit racing in the fuel line close to the carb, from then on it always started right away as the gas never had a chance to escape from the line. When the pump started it was always primed. |
#26
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I thought about it for a couple of days and my theory was the sock was plugged. The pump is pulling so hard that air is getting in past the rubber lines. I pulled the sender and sure enough it was plugged up. I have it back in the tank and everything seems to be running well now. I can dive the truck again and it doesn't stall anymore. Much more junk came out then what is in this picture.
So next I'll pull the tank and flush it. The prior owner said he "drained the tank", but I think I just pulled the gas out and never flushed the tank.
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Jerr 1963 305 V6 1500 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#27
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I believed that what is left of the fuel that had dried up in the tank. Hopefully it won't make your intake valves stick.
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#28
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so some updates.
Truck as been running well, but lot's of black soot out of the exhaust on driveway. I pulled the 73 jets and installed 72. I also put in some clean plugs to keep track of how they look. I can't imagine one size down is enough... but I'll just drive it an see. Long term plan is to install an O2 gauge, but this will tell me something for now at least. Anyone running a 2" tach? they are either cheap garbage or really expensive... nothing in between. ![]()
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Jerr 1963 305 V6 1500 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Last edited by jerrspud; June 26th, 2019 at 06:49 PM. |
#29
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Put some miles on it and see if the black soot in the tailpipe goes away. Have you been tracking your gas mileage? This will also show an improvement if it was too much fuel. Should also perform better to. |
#30
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Put an HEI in as well if you don't already have one to help burn the fuel. I'm running a 500 cfm eddy 4 barrel on my 305E. Opened up a magnum intake. It's way more than the engine needs, but ready for the future 401 or 478 I may find.
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"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
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Thread | Thread Starter | Forum | Replies | Last Post |
Re: [6066 GMC] 305E & New Holley 500 problem. | Archiver | Previous Forum Posts | 0 | August 11th, 2008 10:08 AM |
305E & New Holley 500 problem. | Archiver | Previous Forum Posts | 0 | August 11th, 2008 02:57 AM |
Holley 350 or 500 cfm on 305E | Archiver | Previous Forum Posts | 0 | August 21st, 2006 01:32 AM |
Holley 500 on a 305E? | Archiver | Previous Forum Posts | 0 | July 18th, 2005 02:07 PM |
Re: [6066 GMC] Holley 500 on a 305E? | Archiver | Previous Forum Posts | 0 | July 18th, 2005 01:23 AM |