The Ford Barn

custom_lettering · 02-09-2020, 12:14 PM

Hi Everyone,
I have a question on fuel pressure with my stock 49 Ford club coupe. It has a 8ba motor and a EAB 94 carb. It leaks from the throttle shaft and the shaft is tight. I have a rebuilt kit I'm going to use after I check the float level. From what I understand it's usually the float or fuel pressure that causes that if the throttle shaft is tight.
Here is my question. I checked the pressure and it's at 4. The green bible says 3.5 to 4.5 but when I search what other people say I keep seeing 2.5 and 3.
Before I take the carb apart should I get a fuel pressure regulator and set it to 2.5 to see if that is the problem or is 4 ok and it's more then likely the float.
Thanks in advance!! Bill

Alaska Jim · 02-09-2020, 12:23 PM

In my opinion, anymore than 3 psi will probably cause problems. I like to run the "94" carbs at 2.5 psi. get a good quality low pressure regulator. Holly makes a nice chrome one. I do not have a part # here off hand. you may have to fabricate a bracket, and change your fuel lines around a bit. stay away from those cheap round chrome inline ones, they are prone to leaks, according to many people here on the forum

custom_lettering · 02-09-2020, 12:30 PM

Quote:

Originally Posted by Alaska Jim

In my opinion, anymore than 3 psi will probably cause problems. I like to run the "94" carbs at 2.5 psi. get a good quality low pressure regulator. Holly makes a nice chrome one. I do not have a part # here off hand. you may have to fabricate a bracket, and change your fuel lines around a bit. stay away from those cheap round chrome inline ones, they are prone to leaks, according to many people here on the forum

Thank you sir. The Holley 12-804 seems to be the good one. The car runs great so before I start fooling with the carb I'll get the regulator and adjust it down and see if that stops the leak. Thanks Again!!!

grumppyoldman · 02-09-2020, 01:34 PM

Do not buy the Mr. Gasket pressure regulator it's cheap and works like it. I had to set the regulator at a minimum setting to get 2 1/2 # on the gauge. runs great. Al

JSeery · 02-09-2020, 06:22 PM

Be sure you get the correct one (pressure range) there are different pressure ones that look the same.

Holley Fuel Pressure Regulators 12-804 is listed as 1 to 4 psi.

mfirth · 02-10-2020, 07:43 AM

Sponsored Links (Register now to hide all advertisements)

Bill, also be aware that today's fuel will percolate after shut down of a warm engine. I have a newer Carpenter carb. , with regulator in line set at 2.5-3 lbs. When engine heat heats the float bowl it boils the fuel and fuel comes out around the shaft. Just be aware.

custom_lettering · 02-10-2020, 12:32 PM

Thanks again guys!! Also thank you to a gentleman named Ken for calling me to let me know the new fuel pumps have a strong spring and if you replace it with an old one it will drop the pressure down. Great info.

Alaska Jim · 02-10-2020, 03:53 PM

I forgot to mention the ethanol fuel problem causing perculaton. we do not have ethanol fuel here in Alaska that I am aware of.

JSeery · 02-10-2020, 05:28 PM

I looked it up and the internet says no ethanol in Alaskan fuel (and you know the internet has to be correct!

). I can see with the amount of outdoor equipment used there and a lot of vehicles setting for long periods of time how ethanol would not be the best idea.

02-09-2020, 12:14 PM	#1
custom_lettering Member Join Date: Jun 2010 Location: NJ Posts: 50	fuel pressure question Hi Everyone, I have a question on fuel pressure with my stock 49 Ford club coupe. It has a 8ba motor and a EAB 94 carb. It leaks from the throttle shaft and the shaft is tight. I have a rebuilt kit I'm going to use after I check the float level. From what I understand it's usually the float or fuel pressure that causes that if the throttle shaft is tight. Here is my question. I checked the pressure and it's at 4. The green bible says 3.5 to 4.5 but when I search what other people say I keep seeing 2.5 and 3. Before I take the carb apart should I get a fuel pressure regulator and set it to 2.5 to see if that is the problem or is 4 ok and it's more then likely the float. Thanks in advance!! Bill

02-09-2020, 12:23 PM	#2
Alaska Jim Senior Member Join Date: May 2010 Location: Palmer, Alaska Posts: 1,575	Re: fuel pressure question In my opinion, anymore than 3 psi will probably cause problems. I like to run the "94" carbs at 2.5 psi. get a good quality low pressure regulator. Holly makes a nice chrome one. I do not have a part # here off hand. you may have to fabricate a bracket, and change your fuel lines around a bit. stay away from those cheap round chrome inline ones, they are prone to leaks, according to many people here on the forum

02-09-2020, 01:34 PM	#4
grumppyoldman Senior Member Join Date: Apr 2017 Location: Texas Gulf Coast Posts: 727	Re: fuel pressure question Do not buy the Mr. Gasket pressure regulator it's cheap and works like it. I had to set the regulator at a minimum setting to get 2 1/2 # on the gauge. runs great. Al

02-09-2020, 06:22 PM	#5
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: fuel pressure question Be sure you get the correct one (pressure range) there are different pressure ones that look the same. Holley Fuel Pressure Regulators 12-804 is listed as 1 to 4 psi.

02-10-2020, 07:43 AM	#6
mfirth Senior Member Join Date: Aug 2017 Location: ohio Posts: 986	Re: fuel pressure question Sponsored Links (Register now to hide all advertisements) Bill, also be aware that today's fuel will percolate after shut down of a warm engine. I have a newer Carpenter carb. , with regulator in line set at 2.5-3 lbs. When engine heat heats the float bowl it boils the fuel and fuel comes out around the shaft. Just be aware.

02-10-2020, 12:32 PM	#7
custom_lettering Member Join Date: Jun 2010 Location: NJ Posts: 50	Re: fuel pressure question Thanks again guys!! Also thank you to a gentleman named Ken for calling me to let me know the new fuel pumps have a strong spring and if you replace it with an old one it will drop the pressure down. Great info.

02-10-2020, 03:53 PM	#8
Alaska Jim Senior Member Join Date: May 2010 Location: Palmer, Alaska Posts: 1,575	Re: fuel pressure question I forgot to mention the ethanol fuel problem causing perculaton. we do not have ethanol fuel here in Alaska that I am aware of.

02-10-2020, 05:28 PM	#9
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: fuel pressure question I looked it up and the internet says no ethanol in Alaskan fuel (and you know the internet has to be correct! ). I can see with the amount of outdoor equipment used there and a lot of vehicles setting for long periods of time how ethanol would not be the best idea.