The Ford Barn

Sdmarsha1 · 10-22-2023, 07:00 PM

Hopefully someone here can help me out with my carb issue. I have a 1951 f1 with a stock flathead v8. I put a replacement carb from national carburetor 3 years ago, truck ran great. A couple months ago the power valve was leaking, so I replaced it with one that was rated too low, so it was flooding out. Just went through the carb and put a correct power valve and kit from vintage speed, now the carb has to have a little more than 1/4 choke or it dies. I have checked for air and vaccum leaks, carb runs 17in hg of vaccum at idle. I thoroughly cleaned the carb when I had it down, probably only had 100 miles on it when I tore it down. I have checked and replaced the vaccum advance. What recommendations does anyone have?

Phil Gillespie · 10-22-2023, 07:12 PM

Hows the air filter? Try running with this removed to check for restricted air flow?
Phil NZ

Sdmarsha1 · 10-22-2023, 07:23 PM

Filter seems fine. Doesn't seem to affect it any when I take it off.

38 coupe · 10-23-2023, 05:44 AM

Sounds like your idle circuits are not working. I would take the carburetor back appart and verify each passage is clear and all gaskets are accounted for. I use water as hot as I can stand and "flow" each passage at the shop sink (with screen over the drain in case I drop something) when rebuilding a carburetor. I sometime have to clean a passage with a single strand of copper from a multi-strand wire to clear a clog.

Terry,OH · 10-23-2023, 06:19 AM

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17 in of vacuum is low.

10-22-2023, 07:00 PM	#1
Sdmarsha1 Junior Member Join Date: Oct 2023 Posts: 3	Holley 94 problem Hopefully someone here can help me out with my carb issue. I have a 1951 f1 with a stock flathead v8. I put a replacement carb from national carburetor 3 years ago, truck ran great. A couple months ago the power valve was leaking, so I replaced it with one that was rated too low, so it was flooding out. Just went through the carb and put a correct power valve and kit from vintage speed, now the carb has to have a little more than 1/4 choke or it dies. I have checked for air and vaccum leaks, carb runs 17in hg of vaccum at idle. I thoroughly cleaned the carb when I had it down, probably only had 100 miles on it when I tore it down. I have checked and replaced the vaccum advance. What recommendations does anyone have?

10-22-2023, 07:12 PM	#2
Phil Gillespie Senior Member Join Date: Sep 2011 Location: Christchurch New Zealand Posts: 1,611	Re: Holley 94 problem Hows the air filter? Try running with this removed to check for restricted air flow? Phil NZ

10-22-2023, 07:23 PM	#3
Sdmarsha1 Junior Member Join Date: Oct 2023 Posts: 3	Re: Holley 94 problem Filter seems fine. Doesn't seem to affect it any when I take it off.

10-23-2023, 05:44 AM	#4
38 coupe Senior Member Join Date: May 2010 Location: South Texas Posts: 1,631	Re: Holley 94 problem Sounds like your idle circuits are not working. I would take the carburetor back appart and verify each passage is clear and all gaskets are accounted for. I use water as hot as I can stand and "flow" each passage at the shop sink (with screen over the drain in case I drop something) when rebuilding a carburetor. I sometime have to clean a passage with a single strand of copper from a multi-strand wire to clear a clog.

10-23-2023, 06:19 AM	#5
Terry,OH Senior Member Join Date: May 2010 Posts: 4,751	Re: Holley 94 problem Sponsored Links (Register now to hide all advertisements) 17 in of vacuum is low.