Fuel leaking at transition slot
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Fuel leaking at transition slot
I've got a Barry Grant tuned Holley 750 dp. This is a carb I bought off eBay and it's having some problems. I noticed that after running, and the car sits for a while, it takes a bunch of cranks to get car started. After I got it running for a few minutes I shut it off and looked at the carb. Sure enough, there seems to be air & fuel leaking out of the transition slot. What I mean is I see a bubble every 2 seconds or so come from the transition slot (primary side) and then I can see a small amount of fuel sread out over the throttle blade. It appears to happen only on the driver side primary blade. It's not so bad that the bowl completely goes dry....or, at least, the next morning I can pump throttle and gas comes out.
Any ideas?
Lars???
Any ideas?
Lars???
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
I had kind of the same problem except my carb was bubbling out of the air bleeds. I got one of those inexpensive heat shield/insulating gaskets made by Holley. I used both for a while but now I only use the insulator part. It seems to work....
Brett
Brett
Pro
Joined: Mar 2003
Posts: 553
Likes: 1
From: Valparaiso IN
Originally Posted by tshort
What is this insulator? Have a picture or part number?
Thanks.
Thanks.
http://store.summitracing.com/defaul...=egnsearch.asp
Steve
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
OK, I tried a 1" phenolic and that didn't do the trick. When I shut the engine off and see the fuel boiling out I touched the spacer and it is cold to the touch. Maybe it's my fuel line?? It rests agains the coolant line and probably picks up a fair amount of heat.
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Brett Foote
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Originally Posted by Brettmc
Could be. Does this carb have all the stock Holley parts on it?
Brett
Brett
Not sure if it's related but the throttle shafts seem to have too much play. I've been considering either taking it to a carb shop to have them tighen it up or just replace with a billet base plate.
Last edited by tshort; Aug 29, 2005 at 04:08 PM.