how many use fuel regulators? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67chevemall · 12-09-2004, 05:41 PM

Just wondering if a fuel regulator is a good idea or not?

I know I want a gauge but maybe a reg. too!

What is the best fuel pressure for a 350 block with a holley 4150 carb?

Cheers

cableguy0 · 12-09-2004, 06:32 PM

the most common regulator is made by holley if you buy it from edelbrock you will find they just ground off the holley logo. and yea i run one i have no choice electric holley blue pump

SweetandLong68 · 12-10-2004, 12:24 AM

Hey,

It is always a good idea to run a fuel pressure regulator. Closer to the carb the better. A gauge on the regulator or between the regulator and the carb is a definete good idea. One of the 0-15psi variety will serve you well.

But yes...It is always a good idea to use a regulator. That way you can know what pressure you are running. And if you use a carb like a edelbrock...you have to run a regulator or your engine will run like crap.

lata
CHRIS

Blue68 · 12-10-2004, 10:06 AM

Hmm...I've run an Edelbrock for many years without a regulator and run just fine. With both a mechanical and electric fuel pumps.

Why do you guys say you have to? So long as your pump isn't of a higher (above about 7psi) flavor, right?

67chevemall · 12-10-2004, 12:21 PM

I'm confused at what pressure to set the regulator?
How do you tell your at a "good" pressure?
Just by the way the truck runs, or can you tell by looking at the fuel mist?
Or ??

Is there a factory pressure that GM set for 350 blocks with 4 barrels??

toddtheodd · 12-10-2004, 12:33 PM

Quote:

Originally Posted by ZOOMY

If you're running an Edelbrock carb, you had better use one.

Maybe that's what's the matter with my truck.
What is the psi supposed to be for an edelbrock?
Todd

Bowtiefreak · 12-10-2004, 01:17 PM

Eddy carbs typically don't like anymore than 4-5 psi. Holley's run well at 6-7psi. Anymore than 7 psi on a Holley and then they typically start to be more than the needle and seats can handle and then they just start to flood over.

mdazb · 12-10-2004, 01:39 PM

What's the psi without a reg. (Mech.pump)?

shortymac83 · 12-10-2004, 01:50 PM

here's a cheap regulator. Buddy of mine has a 455 that he put in a 81 delta 88 with all of the computer wiring and such, so if you just glance, it looks like a 307. He even reused the 307 mech. pump, but the motor was sucking the float bowl dry. Threw on a Holley Blue back by the tank, and he's still running the mech. pump as well to act as a regulator. No gas problems now. maybe you could do something similar. then you get the amount of gas you need (choose the mech. pump to fit your needs) and always have gas because of the electric pump at the back.

krazy_texan · 12-10-2004, 02:17 PM

could that be part of the reason of my bad gas mileage on my trucks i have been running an edelbrock carb for about 3 years now and seem to have no problem with it.

shortymac83 · 12-10-2004, 02:33 PM

what, lack of gas? he was having a problem with the motor stumbling over 5,000 RPM, and running lean and detonating when on the highway for over 20 minutes.

Bad gas mileage is one of 4 things:

really, really bigass gears in the back
really, really bigass motor in the front
really, really heavy right foot
or a poor carb. could either need a rebuild or a simple tune. before I replaced the computer's sensors and rebuilt the carb, I was averaging 9 MPG with a 307 powered delta 88. Did all that stuff, and saw a best ever of 26 mpg on the ohio turnpike 2 summers ago. sits right around 17 mpg, even with my leadfoot.

Tx Firefighter · 12-10-2004, 09:38 PM

All my trucks run stock mechanical pumps and Edelbrock carbs. Never a regulator and never a problem.

hgs_notes · 12-10-2004, 09:45 PM

I had to put a regulator in when I was running a holley because the pressure was over about 7 psi off the original mech pump, which I still use. The needle and seat would leak by and flood the bowl until gas was coming out the bowl vent and flooding the engine. Prior to that, I had a spread bore rochester that ran fine on the same pump and same engine. Go figure?

HG

breeh · 12-11-2004, 03:35 AM

On my friend's BBC project we had the same problem. He bought the Edelbrock "matched" components. 850 CFM carb with the Edelbrock fuel pump and the needles were being pushed off of the seats causing it to flood.

SweetandLong68 · 12-11-2004, 08:13 PM

Quote:

Originally Posted by Bowtiefreak

Eddy carbs typically don't like anymore than 4-5 psi. Holley's run well at 6-7psi. Anymore than 7 psi on a Holley and then they typically start to be more than the needle and seats can handle and then they just start to flood over.

You are exactly right. I usually set mine at about 4.5psi and that usually works pretty well. But it more depends on your setup.

lata
CHRIS

Bowtiefreak · 12-11-2004, 08:53 PM

Some guys say they can run Eddy carbs without regulators and some say they need to run them, both are right, it just depends on your fuel pump. Same goes for Holleys,Demons Q-jets,etc... There are several mechanical pumps out there that really push the 7 psi mark and some that are only around 4-5 psi. The same can be said about electrical versions as well. It just depends on the pump it self. Both Holley and Edlebrock have their fuel pressure specs on their websites (I think) I have plumbed alot of fuel systems in my life and its surprising how much some of the companies differ. Believe me, all fuel pumps and regulators are not built to the same quality.

12-09-2004, 05:41 PM	#1
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	how many use fuel regulators? Just wondering if a fuel regulator is a good idea or not? I know I want a gauge but maybe a reg. too! What is the best fuel pressure for a 350 block with a holley 4150 carb? Cheers __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

12-09-2004, 06:32 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	the most common regulator is made by holley if you buy it from edelbrock you will find they just ground off the holley logo. and yea i run one i have no choice electric holley blue pump __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

12-10-2004, 12:24 AM	#3
SweetandLong68 Your UncleBen Join Date: Dec 2002 Location: Indian Trail, NC Posts: 590	Hey, It is always a good idea to run a fuel pressure regulator. Closer to the carb the better. A gauge on the regulator or between the regulator and the carb is a definete good idea. One of the 0-15psi variety will serve you well. But yes...It is always a good idea to use a regulator. That way you can know what pressure you are running. And if you use a carb like a edelbrock...you have to run a regulator or your engine will run like crap. lata CHRIS __________________ 68 C10 shortbed -- Street/Strip

12-10-2004, 10:06 AM	#4
Blue68 Registered User Join Date: Apr 2000 Location: Frisco, Tx, USA Posts: 606	Hmm...I've run an Edelbrock for many years without a regulator and run just fine. With both a mechanical and electric fuel pumps. Why do you guys say you have to? So long as your pump isn't of a higher (above about 7psi) flavor, right? __________________ http://home.comcast.net/~r.landrum/w...tos.html-.html '68 C-10 LWB, '98 Z-71 350 w/accessories (Serpentine), Edelbrock Performer, Edelbrock 1405 (600cfm) carb, GM HEI, CompCam Extreme 4x4 roller cam, Thorley Headers, Carter Electric Fuel Pump, Vintage Air, 700r4, 3.73, disc brakes and power steering upgrades.

12-10-2004, 12:21 PM	#5
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	I'm confused at what pressure to set the regulator? How do you tell your at a "good" pressure? Just by the way the truck runs, or can you tell by looking at the fuel mist? Or ?? Is there a factory pressure that GM set for 350 blocks with 4 barrels?? __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

12-10-2004, 01:17 PM	#7
Bowtiefreak Registered User Join Date: Jul 2003 Location: LeRoy, Mich. Posts: 854	Eddy carbs typically don't like anymore than 4-5 psi. Holley's run well at 6-7psi. Anymore than 7 psi on a Holley and then they typically start to be more than the needle and seats can handle and then they just start to flood over. __________________ 1968 Chevy C10 Short Fleetside/Wood floor ECE 4-6 Drop / 406 Small Block 1971 Chevelle 427 Big Block

12-10-2004, 01:39 PM	#8
mdazb Registered User Join Date: Oct 2004 Location: Nor Cal Posts: 75	What's the psi without a reg. (Mech.pump)? __________________ --------------------------------- 72 C10 SWB 350 Work in progress 98 HD Fatboy 09 HD Heritage Softail 05 Honda Element

12-10-2004, 01:50 PM	#9
shortymac83 hmm... Join Date: Jan 2004 Location: Culver, Indiana Posts: 1,631	here's a cheap regulator. Buddy of mine has a 455 that he put in a 81 delta 88 with all of the computer wiring and such, so if you just glance, it looks like a 307. He even reused the 307 mech. pump, but the motor was sucking the float bowl dry. Threw on a Holley Blue back by the tank, and he's still running the mech. pump as well to act as a regulator. No gas problems now. maybe you could do something similar. then you get the amount of gas you need (choose the mech. pump to fit your needs) and always have gas because of the electric pump at the back. __________________ 1983 Oldsmobile Delta 88 1967 Chevy C-10 stripper www.fcrperformance.com - wanna go...faster? talk to FCR. Last edited by shortymac83; 12-10-2004 at 01:52 PM.

12-10-2004, 02:17 PM	#10
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	could that be part of the reason of my bad gas mileage on my trucks i have been running an edelbrock carb for about 3 years now and seem to have no problem with it. __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

12-10-2004, 02:33 PM	#11
shortymac83 hmm... Join Date: Jan 2004 Location: Culver, Indiana Posts: 1,631	what, lack of gas? he was having a problem with the motor stumbling over 5,000 RPM, and running lean and detonating when on the highway for over 20 minutes. Bad gas mileage is one of 4 things: really, really bigass gears in the back really, really bigass motor in the front really, really heavy right foot or a poor carb. could either need a rebuild or a simple tune. before I replaced the computer's sensors and rebuilt the carb, I was averaging 9 MPG with a 307 powered delta 88. Did all that stuff, and saw a best ever of 26 mpg on the ohio turnpike 2 summers ago. sits right around 17 mpg, even with my leadfoot. __________________ 1983 Oldsmobile Delta 88 1967 Chevy C-10 stripper www.fcrperformance.com - wanna go...faster? talk to FCR.

12-10-2004, 09:38 PM	#12
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	All my trucks run stock mechanical pumps and Edelbrock carbs. Never a regulator and never a problem. __________________ I'm on the Instagram- @Gearhead_Kevin

12-10-2004, 09:45 PM	#13
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	I had to put a regulator in when I was running a holley because the pressure was over about 7 psi off the original mech pump, which I still use. The needle and seat would leak by and flood the bowl until gas was coming out the bowl vent and flooding the engine. Prior to that, I had a spread bore rochester that ran fine on the same pump and same engine. Go figure? HG __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

12-11-2004, 03:35 AM	#14
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	On my friend's BBC project we had the same problem. He bought the Edelbrock "matched" components. 850 CFM carb with the Edelbrock fuel pump and the needles were being pushed off of the seats causing it to flood. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

12-11-2004, 08:53 PM	#16
Bowtiefreak Registered User Join Date: Jul 2003 Location: LeRoy, Mich. Posts: 854	Some guys say they can run Eddy carbs without regulators and some say they need to run them, both are right, it just depends on your fuel pump. Same goes for Holleys,Demons Q-jets,etc... There are several mechanical pumps out there that really push the 7 psi mark and some that are only around 4-5 psi. The same can be said about electrical versions as well. It just depends on the pump it self. Both Holley and Edlebrock have their fuel pressure specs on their websites (I think) I have plumbed alot of fuel systems in my life and its surprising how much some of the companies differ. Believe me, all fuel pumps and regulators are not built to the same quality. __________________ 1968 Chevy C10 Short Fleetside/Wood floor ECE 4-6 Drop / 406 Small Block 1971 Chevelle 427 Big Block



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