So here's the latest he says, he says for my '81.
I'm putting an Edelbrock AVS2 on a 2701 intake. Putting headers and dual exhaust. Switched to a mild Comp cam and some Pistons that will give me a mild 9.0 - 9.5 :1 compression. The entire engine is rebuilt.
The guy building it says the stock 7.5 - 9.0 psi fuel pump will work fine with the Edelbrock AVS2 carb without a regulator. I've talked to a couple of Edelbrock techs and they insist that 4.5 - 5.5 psi is optimal, with no more than 6.5 psi. Edelbrock is emphatic that more than 6.5 will cause needle/seat issues and flooding.
Do we have any techs, "experts," or people with experience with this that can add factual advice?
The guy building it has 40 years experience and worked for Chevy dealer as their Corvette guy.

 

Follow the needle & seat manufacturer's instruction.

 

I am certainly no expert but had issues of the 9psi pushing by the needle and seat until I put a regulator on mine. I have it set to a hair over 5psi and no more issues. The Edelbrock mechanical pump is advertised at 6psi and may work without a regulator just fine. I had a Holley carb and pump and when I switched to the Edelbrock carb it was too much pressure.

 

Most of the edelbrock sstuff is based on no more than 6 psi. een the small fuel pumps. The list it right in the product description. I bought the bigger edelbrock pump to bring it down to the pressure I want.
Why would you talk to the manufacturer then question them and trust some guy that works on them and has an OPINION. Thats where a lot of people get into trouble or start spending money chasing problems caused by mechanics. They have egos and can be just as fallible as the rest of us. I have Edelbrock carbs and I had lots of problems with fuel pressure. Then I switched to a Quadrajet and guess what. They dont like high fuel pressure either. Now Ive got an old Edelbrock quadrajet. LOL. I use holley pressure regulators but you have to have a pressure gauge in line because they can fail too.

YOu may want to consider a phenolic block between the carb and intake to prevent perculation as well. Everyone with Edelbrocks goes through it when it gets warm outside. ALSO, When you're tuning for wot throttle, if you get a bog when you stomp on it,ITs usually a lean condition cause by the Secondary air vavle. The secondary air vavle on your new carb has a similar adjustment as the quadrajet that will get rid of it. Its caused by that upper flap openning to fast and fluttering until it stabilizes or the motor can use all that air. Its a great improvement that I wish the old Eddy carbs had.

Have fun!!

 

The Edelbrock WILL barf fuel from the boosters if higher than 6 psi......it just does. Althought he floats are brass, they just get pushed down to easy as it is not the tang on the float that is the issue, it within itself is very hard to bend. Edelbrock should pend some R&D here as it wouldn't take a lot to make a float from nitrophyl.
This is a lot of the reason I will not run these carbs for a serious performance application.......when they bounce around a lot they puke too. Two giant *** float bowls and negated by a float that is not buoyant enough.
Up to 400 horsepower or 100mph or so in the quarter mile ok.........not much after. Look around at the track and car shows and nobody with any serious power runs the Edelbrock. That said....it makes a great mixer for around town but the weighted secondary flaps are not adjustable on the first series. The AVS is spring loaded and the AVS2 has billet primary boosters. I want to try an AVS2 on something but nothing in that genre right now at the shop.

Stock pump is usually ok....but any aftermarket performance pump will give you trouble.

Jebby

 

Nope. The stock pumps from Carter are garbage, I've been through 3 different replacement ones. My edelbrock pivot pin is pressed into a hole. The carters are swaged in from the side. I wont run a stock pump again.

 

most carbs will flood with anything over 6.5 -7 psi.. your mechanic is misinformed if he thinks the needle and seat can hold 9 psi

 

Hijacking this thread a little. In running an acdelco pump, advertised at 9 psi too. Haven't seen it burping fuel but would explain some stuff.

What regulators are y all running? Over here filterking style regulators is the only thing that readily aviable.

 

Agree with above comments - 6 psi max for Edelbrocks. I am running an inexpensive Summit regulator -

 

Holley regulator


Plumbing comes off the filter. Inkine pressure gauge. Then to a fuel cooler. Through a one way valve and filter to the regulator on the wheel well. Inline filter mounted to the regulator. Off the regulator through an electric pressure sensor for a dash gauge then to the quadra jet. Overkill for some, diagnostic tools for others

In this pic the sensor and gauge are flipped

 

I agree with this wholeheartedly. After having fuel flooding out of my Edelbrock on my 66 Mustang (I know, wrong forum, but thought it applicable), I realized the pump was pushing way more than 5.5psi. I bought a guage, put it inline and wow, almost 9psi. So, I bought a stock fuel pump, it came right down into the Edelbrock sweet spot, and no more issues.
And, to second what Jebby said, I went with an Edelbrock because of the electric choke, and the "it runs the same all the time". So far, the carb on top of my 76 Corvette is the only non-Edelbrock that I've *not* had to dink with literally every time I run the car. If you want power - Holley. If you want reliability crusing around town - Edelbrock. From my limited experience though, Holley means you have to know how to adjust a carb!