69 z28 original rebuilt holley carb problem - Team Camaro Tech
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post #1 of 12 (permalink) Old Jun 6th, 15, 04:24 AM Thread Starter
Chris
 
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69 z28 original rebuilt holley carb problem

Any idea what would cause my rebuilt carb to flood so bad
just a few seconds after starting the car. With the air cleaner off it look like a fountain! It does this almost every time I start the car. Other times it runs great. Any ideas?
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post #2 of 12 (permalink) Old Jun 6th, 15, 05:01 AM
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Brian
 
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Re: 69 z28 original rebuilt holley carb problem

What kind of fuel pump are you using? What is your fuel pressure? Have you adjusted the float levels on the carb? Give us a little info on your setup and what you've done so far.

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post #3 of 12 (permalink) Old Jun 6th, 15, 05:06 AM
Tom
 
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Re: 69 z28 original rebuilt holley carb problem

I had the same thing happen on a brand new edelbrock carb. Turned out to be a bad float.
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post #4 of 12 (permalink) Old Jun 6th, 15, 05:12 AM
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Matt
 
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Re: 69 z28 original rebuilt holley carb problem

Check the floats as Brian suggested. The fuel level should be just below the level of the sight plug with the car sitting on level ground. If that checks out, check the needle and seat assembly on both bowls. One spec of dirt will keep the needle from seating and will flood the carburetor. I don't know what fuel pump you are using, but carbureted engines should be right around 6 psi. Too much fuel pressure can cause the problem that you are experiencing. These are all easy things to check. Let us know what you find.

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post #5 of 12 (permalink) Old Jun 6th, 15, 05:46 AM
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Jess
 
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Re: 69 z28 original rebuilt holley carb problem

X2 on the floats. Make sure your cylinders arent flooded and has hydrolocked.

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post #6 of 12 (permalink) Old Jun 7th, 15, 03:50 PM
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Re: 69 z28 original rebuilt holley carb problem

One of the most common issues after a rebuild or any messing with fuel lines or tank... espec if they have been laying around for a while
Dried crap flakes off the inside of pipes, tanks.. and stuff from the tank, tiny bit of dried seal from inside the pump breaks off... list goes on.

It is so common, expect it to happen some time , some times 2 or 3 times in the 1st 500 miles
If the stuff gets into jets etc.... side of the road .. remove air filter, engine running , hand over the carb, keep rpms up, dont let stall.. when huge vaccuum pulled suddenly release your hand 2 to 5 times .....9 out of 10 times problem 'fixed'

My Spelling is not incorrect...it is creative

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post #7 of 12 (permalink) Old Jun 8th, 15, 04:17 PM
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Re: 69 z28 original rebuilt holley carb problem

Quote:
Originally Posted by Steptoe View Post
One of the most common issues after a rebuild or any messing with fuel lines or tank... espec if they have been laying around for a while
Dried crap flakes off the inside of pipes, tanks.. and stuff from the tank, tiny bit of dried seal from inside the pump breaks off... list goes on.

It is so common, expect it to happen some time , some times 2 or 3 times in the 1st 500 miles
If the stuff gets into jets etc.... side of the road .. remove air filter, engine running , hand over the carb, keep rpms up, dont let stall.. when huge vaccuum pulled suddenly release your hand 2 to 5 times .....9 out of 10 times problem 'fixed'
They did that on an episode of road kill. It was the episode where they battled a surburan vs a bronco vs a toyota. It actually worked.

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post #8 of 12 (permalink) Old Jun 8th, 15, 04:24 PM
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Re: 69 z28 original rebuilt holley carb problem

What is road kill?
Dont think we get that in this country....
Road kill here is a possum or rabbit, stoat or cat run over by a vechile ... usually at night.
All far game, they are serious pests here to our native environment.

My Spelling is not incorrect...it is creative

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post #9 of 12 (permalink) Old Jun 8th, 15, 08:31 PM
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Re: 69 z28 original rebuilt holley carb problem

Quote:
What is road kill?
Dont think we get that in this country....
Road kill here is a possum or rabbit, stoat or cat run over by a vechile ... usually at night.
All far game, they are serious pests here to our native environment.
In some parts of Texas, Louisiana, and a few others it's called Dinner.

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post #10 of 12 (permalink) Old Jun 9th, 15, 12:59 PM
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Re: 69 z28 original rebuilt holley carb problem

I'll ditto on the floats. When I rebuilt the carb and replaced the float valves I did not find a matching number between the parts I was taking out and the parts in the kit, so I picked what looked like a match. I picked wrong and got the same result you had. I then did the right thing and called Holley where I learned which float valves to use from the kit. Popped in the new valves and have had no problem since.
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post #11 of 12 (permalink) Old Jun 9th, 15, 02:37 PM
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Re: 69 z28 original rebuilt holley carb problem

Intermittent issues as you're describing are typically caused by the needle & seat sticking.

What kind of kit did you use? If it doesn't have original Holley style needle & seats, that may be your problem.

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post #12 of 12 (permalink) Old Jun 13th, 15, 03:49 PM
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Tom
 
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Re: 69 z28 original rebuilt holley carb problem

Quote:
Originally Posted by Chris Clark View Post
Any idea what would cause my rebuilt carb to flood so bad
just a few seconds after starting the car. With the air cleaner off it look like a fountain! It does this almost every time I start the car. Other times it runs great. Any ideas?
Yes the floats stick at the bottom
Could be binding.

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