Fuel Leak at Carburetor

[Chad E.]

[Clem Z.]

Re: Fuel Leak at Carburetor

sound like the accelerator pump diaphragm is shot

[David B.]

Re: Fuel Leak at Carburetor

I wouldn't put any money into the Holley. I would look for a correct Quadrajet instead. I don't think it would be too pricey to end up with a rebuilt QJet for it.

[Terry M.]

Re: Fuel Leak at Carburetor

Welcome to the wonderful world of Holley. My 1970 LT1 carburetor leaked from the accelerator pump from day 2. It probably would have been day 1, but I didn't open the hood on day 1.

[Edward J.]

Re: Fuel Leak at Carburetor

Chad, a quick look down the throat of the carb to see if maybe you may be dumping fuel, due to a float or needle and seat issue. As Clem say the accel. pump diafram is a common problem.Ed

[Kurt G.]

Re: Fuel Leak at Carburetor

Like David said. Don't waste money on the Holley. I just got a date code correct Quad for my 72 from a guy in New Braunfels, TX. I'm on the road for the next 5 days and don't have his name with me. However, the carb cost me, including shipping and a fresh overhaul by Quality Carbs, $690. Put it on on Thursday of this week, started up within 5 seconds. All I had to do was a 100 rpm idle adjustment and a little tweak on the idle mixture jets. The car has never run as good, and it now has the correct, date correct carb on it. Worth every penny and then some.

[Bill C.]

Re: Fuel Leak at Carburetor

my 2 cents....

pickup a $60 rebuild kit for the carb - take the time to do a nice rebuild on it and you will have a great carb.

I have both carbs and I have swapped them back and forth on my 72.
The quadrajet is an easier carb to get right, the first time. It hooks up correctly, idles nicly etc...

But it does not have the WOT response that the Holley does.
The Holley takes more time to tweek and get correct but once it is done, I really believe it significantly outperforms the Quadrajet -- by alot.

You have to do some work with the airlceaner to get it to not hit the rear accellorator pump arm on the 6210, but it can be done.

If you are not concerned with numbers and dates - I really feel the Holley is worth the time and investment...

My 2 cents.....

[Clem Z.]

Re: Fuel Leak at Carburetor

if you rebuild the holley carb make sure you use some emery paper on a flat surface to get the pump cover flat as a lot are distorted from over tightening the screws

[Chad E.]

Re: Fuel Leak at Carburetor

That's kind of what I was thinkin' too.

[Chad E.]

Re: Fuel Leak at Carburetor

I decided to keep in the spirit of my "rolling restoration" so I will probably look for a date correct quadrajet. Any ideas?

Thanks to all for the advice!!

[Jack H.]

Re: Fuel Leak at Carburetor

They're out there, but you have to look persistently or go to one of the 'ready to go' sources like (I hate to say this) Chicago Corvette...

For a base engine '71 with MT, you're looking for a 7041213 stamped QJet. If you haven't read the JG book, consider doing this before you roll up you sleeves and start the search. Why?

There were two suppliers (Rochester and Carter) and BOTH are correct. But, the stampings on the main body (including date sequence) will differ based on mfgr source. So, knowing what the 'correct' alternatives are BEFORE you either buy or walk past one that's potentially correct, gives you a leg up!

[Clem Z.]

Re: Fuel Leak at Carburetor

if you want to drive your corvette till you find the correct Q jet i would rebuild the holley to make sure you don't have a fire

[Chad E.]

Re: Fuel Leak at Carburetor

Like David said. Don't waste money on the Holley. I just got a date code correct Quad for my 72 from a guy in New Braunfels, TX. I'm on the road for the next 5 days and don't have his name with me. However, the carb cost me, including shipping and a fresh overhaul by Quality Carbs, $690. Put it on on Thursday of this week, started up within 5 seconds. All I had to do was a 100 rpm idle adjustment and a little tweak on the idle mixture jets. The car has never run as good, and it now has the correct, date correct carb on it. Worth every penny and then some.

Hey Kurt!

When you get back could you let me know the name, email address, or phone # of that guy in New Braunfels, TX?

Thanks!
Chad

[David B.]

Re: Fuel Leak at Carburetor

I decided to keep in the spirit of my "rolling restoration" so I will probably look for a date correct quadrajet. Any ideas?

Thanks to all for the advice!!

Chad,

I am sending you a PM with a guy that I used who did a beautiful QJet for me.

Dave B.

[Jephrey S.]

Re: Fuel Leak at Carburetor

My holley loves to leak from the accelerator pump housing. Originally the diaphram was torn, but even after replacement it still leaks. The surface on the carb is flat, but all 3 covers that I have are not even close to flat. The only thing that stops my leak is a generous application of Permatex.

Not holding idle could very well be the power valve. Get it to idle and try putting your finger over the air tube sticking out the top on the primary side. If the engine dies immediately, the power valve is shot. It sounds like you probably need a complete rebuild. If you are swapping over to a Q-Jet anyway, it probably is not worth the effort.