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-   -   Holley 770 carb question (http://www.clubcobra.com/forums/holley-tuning/132067-holley-770-carb-question.html)

Andrewyoung78 01-04-2015 12:19 AM
Holley 770 carb question
 
I've noticed there is some leakage of gasoline when the car is cold ( first start ).
It's leaking at the screws at the accelerator pump, then it goes away at normal temperature. Is that normal or the pump gasket needs to be replace. The car is a superformance 2008 built with less than 6k miles.

cycleguy55 01-04-2015 12:26 AM
IMO any leakage needs to be addressed as a safety issue / fire hazard. The gasket around the accelerator pump may need to be replaced, but I'd first check the mounting screws to see if perhaps they're a bit loose, and that snugging them up might solve the problem.

Andrewyoung78 01-04-2015 01:49 AM
Exactly my thought. I've been looking at the Holley web site and the pump diphram is the gasket.

Andrewyoung78 01-04-2015 10:57 PM
I marked an index on the screw heads under the diaphram and 2 screws were loose by a 1/4 turn, no leak now. I'll be ordering a tune up kit for replacement for the near future.

madmaxx 01-08-2015 05:47 PM
That is a Roush tuned carburator. Not sure what they modified but if it is not hesitating and running fine I would not touch it. It has a fuel filter by the gas tank so unlikely there are contaminants in the carb.

Andrewyoung78 01-08-2015 06:32 PM
Madmaxx
I agree with you. The car is running fine so I bought a new gasket and diaphram for back up. I will keep checking for any leak for now. Thanks.

madmaxx 01-08-2015 07:11 PM
If u took the air cleaner off make sure you use a drop of loctite on the air cleaner bolt threads as it will come loose. Note I said a drop and make sure it is removable like loctite 242

Andrewyoung78 01-08-2015 08:49 PM
Blue one.

madmaxx 01-09-2015 08:54 AM
yes the blue one.

For grins you can torque the intake manifold bolts to 20 ft-lbs, water pump to 15 ft-lbs, thermostat housing just snug. they are cheap and deform easy, I wouldn't try to get 15ft-lbs just snug up. exhaust manifold bolts go buy a cheap box end wrench and cut a little wedge out of it, then you will be able to tighten the exhaust manifold bolts. open ended wrench is to thick.

PM me with your phone number

Gaz64 01-09-2015 02:23 PM
I prefer to use a nut on the stud to lock the stud in the carb.

2 seconds and the stud can be removed by hand.

Only way to go if you had a carb with idle bypass.

madmaxx 01-09-2015 04:09 PM
He has a beautiful Roush Air cleaner a stud and nut would not look as good

Gaz64 01-10-2015 02:35 AM
Ah I see, but it must a pain to line up.

They do look nice though. :)

I would have a more permanent stud in the carb with a female about 1/4 inch below the lid (which would be easier to line up).

Then there is less risk of finally pulling the threads in the main body from periodic air cleaner removal.

madmaxx 01-10-2015 09:23 AM
the best solution would be to have a rough surface on the air cleaner tapered surface where the allen head bolt goes in to generate friction. In reality the air cleaner should rarely if ever come off so lactate is an easy solution

jhv48 01-10-2015 09:32 AM
Quote:
Originally Posted by madmaxx (Post 1334232)
so lactate is an easy solution
Lactate? Really? Mother's milk has other uses?
Who knew?


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