Do you guys run fuel pressure regulators? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jpayne79k20 · 11-05-2015, 07:33 PM

I have a 79k20 with a 350 and edelbrock carb and edelbrock intake. I heard that edelbrock carbs are very sensitive to fuel pressure and may flood carb. I'm not sure if this is true or not.

ptc · 11-05-2015, 07:44 PM

whether you are running a mechanical or electrical fuel pump to that carb you are probably sending too much psi.

You should have a regulator and most carbs require only about 7 psi.

From Edelbrock:

Fuel pressure should not exceed 6.5 psi. Float level should be verified to be at 7/16. Refer to supplied carburetor owners manual. Verify needle & seats are free of any debris, and have a smooth range of operation and travel. Verify floats are free of any fluid by shaking the float, or submersing it in a safe, non flammable fluid.

jpayne79k20 · 11-05-2015, 08:09 PM

Alright that's what i thought. I'm just not completely sure where to mount all this stuff. Do you have any pictures of how you would do it. I'm trying my best to have it look nice and neat haha

**hatzie** · 11-05-2015, 08:54 PM

If you have a stock mechanical pump it'll be just fine. They typically run between 6 & 8 PSI. Electric is another story.

geezer#99 · 11-05-2015, 09:22 PM

Edelbrock might say 6.5 but real world experience says no more than 5psi.

jpayne79k20 · 11-05-2015, 09:33 PM

I actually had the carb flood my cylinders right out of box. Fuel filter was installed. So I completely tore apart and cleaned. Reinstalled and installed a pressure regulator quick just to be safe.

jpayne79k20 · 11-05-2015, 10:01 PM

I actually had the carb flood my cylinders right out of box. Fuel filter was installed. So I completely tore apart and cleaned. Reinstalled and installed a pressure regulator quick just to be safe.

**hatzie** · 11-06-2015, 01:28 AM

Quote:

Originally Posted by jpayne79k20

I actually had the carb flood my cylinders right out of box. Fuel filter was installed. So I completely tore apart and cleaned. Reinstalled and installed a pressure regulator quick just to be safe.

The needle and seat were not working properly if 6PSI was too much.
Why mess with Chinese floor sweepings. Get a Rochester Quadrajet rebuilt for your rig. The Edelbrock will end up costing you more than a good quality rebuilt Rochester after you factor in time and frustration.

picklito · 11-06-2015, 01:54 AM

I never thought regulators would make any difference when using a stock mechanical pump... until I installed one. It made the carb much more consistent and easier to tune. So, if a guy is going to plop a carb on and just run it, then it's not worth it. But the minute you think you need to change a jet or rod... get a regulator first, get a baseline, then start tuning. Otherwise you'll be fighting the small inconsistencies that come from pressure that's just a little bit too high, and changing with RPM. JMO.

akart · 11-06-2015, 02:26 AM

I have the same set up got an EDL carb and manifold. Don't mess with the separate maybe regulator and gage and where to mount it. Get an ELD fuel pump to match the carb, 6 psi, done deal. In for a dollar in for a dime.

cadillac_al · 11-06-2015, 07:09 PM

I'm not running a regulator on my Edelbrock carb. Seems to work fine.

11-05-2015, 07:33 PM	#1
jpayne79k20 Registered User Join Date: Sep 2015 Location: Pottsville, Pa Posts: 18	Do you guys run fuel pressure regulators? I have a 79k20 with a 350 and edelbrock carb and edelbrock intake. I heard that edelbrock carbs are very sensitive to fuel pressure and may flood carb. I'm not sure if this is true or not.

11-05-2015, 07:44 PM	#2
ptc Registered User Join Date: Mar 2015 Location: Morada, CA --- (Near Lodi) Posts: 1,443	Re: Do you guys run fuel pressure regulators? whether you are running a mechanical or electrical fuel pump to that carb you are probably sending too much psi. You should have a regulator and most carbs require only about 7 psi. From Edelbrock: Fuel pressure should not exceed 6.5 psi. Float level should be verified to be at 7/16. Refer to supplied carburetor owners manual. Verify needle & seats are free of any debris, and have a smooth range of operation and travel. Verify floats are free of any fluid by shaking the float, or submersing it in a safe, non flammable fluid. __________________ My Build: 57 Chevy Pro-Street

11-05-2015, 08:09 PM	#3
jpayne79k20 Registered User Join Date: Sep 2015 Location: Pottsville, Pa Posts: 18	Re: Do you guys run fuel pressure regulators? Alright that's what i thought. I'm just not completely sure where to mount all this stuff. Do you have any pictures of how you would do it. I'm trying my best to have it look nice and neat haha

11-05-2015, 08:54 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Do you guys run fuel pressure regulators? If you have a stock mechanical pump it'll be just fine. They typically run between 6 & 8 PSI. Electric is another story. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

11-05-2015, 09:22 PM	#5
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,733	Re: Do you guys run fuel pressure regulators? Edelbrock might say 6.5 but real world experience says no more than 5psi.

11-05-2015, 09:33 PM	#6
jpayne79k20 Registered User Join Date: Sep 2015 Location: Pottsville, Pa Posts: 18	Re: Do you guys run fuel pressure regulators? I actually had the carb flood my cylinders right out of box. Fuel filter was installed. So I completely tore apart and cleaned. Reinstalled and installed a pressure regulator quick just to be safe.

11-05-2015, 10:01 PM	#7
jpayne79k20 Registered User Join Date: Sep 2015 Location: Pottsville, Pa Posts: 18	Re: Do you guys run fuel pressure regulators? I actually had the carb flood my cylinders right out of box. Fuel filter was installed. So I completely tore apart and cleaned. Reinstalled and installed a pressure regulator quick just to be safe.

11-06-2015, 01:54 AM	#9
picklito Registered User Join Date: Sep 2013 Location: Vacaville CA Posts: 490	Re: Do you guys run fuel pressure regulators? I never thought regulators would make any difference when using a stock mechanical pump... until I installed one. It made the carb much more consistent and easier to tune. So, if a guy is going to plop a carb on and just run it, then it's not worth it. But the minute you think you need to change a jet or rod... get a regulator first, get a baseline, then start tuning. Otherwise you'll be fighting the small inconsistencies that come from pressure that's just a little bit too high, and changing with RPM. JMO.

11-06-2015, 02:26 AM	#10
akart Registered User Join Date: Sep 2014 Location: Manley Hot Springs Alaska Posts: 253	Re: Do you guys run fuel pressure regulators? I have the same set up got an EDL carb and manifold. Don't mess with the separate maybe regulator and gage and where to mount it. Get an ELD fuel pump to match the carb, 6 psi, done deal. In for a dollar in for a dime.

11-06-2015, 07:09 PM	#11
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,376	Re: Do you guys run fuel pressure regulators? I'm not running a regulator on my Edelbrock carb. Seems to work fine. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10



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