Carburetor Question

njk53 · 09-03-2013, 09:41 AM

I opened up our Rochester Q-Jet to re-jet and I noticed in the center of the air horn gasket there is a piece of what looks like electrical tape/plastic material with the holes cut away so the rear metering rods and the hole for the threaded rod for the air cleaner to clear.

I have two different carburetors one done by Dean Oliver and one was done by Hedworth and they both had this piece of tape or plastic in the center. Does anyone know what it is there for?

Jim Cimarolli · 09-03-2013, 09:59 AM

Should be there to control fuel slosh on the leave.

Mike Taylor 3601 · 09-03-2013, 03:02 PM

If have to fix another gasket get 3M super 33 electrical tape works well,another tip is check needle&seat while top is off hold pivot of float down w/finger and turn on fuel pump until float bowl is full and closes needle&seat and watch for about 1-2 minutes w'pump still running fuel level should stay the same,I have needle &seat leak every now and then and found this was my best way to check,they will leak but won't run over and out vent like holley,my car will only idle about 100-150 rpm slower and then bogs about 20-30 foot off starting line. when needle&seat are slightly leaking.
Mike Taylor 3601

R. Thorne · 09-03-2013, 04:28 PM

Also, depending on how tight the rods fit in the tape, a shot of your favorite penetrating oil every so often will keep the rods from possibly hanging open.

09-03-2013, 09:41 AM	#1
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	Carburetor Question I opened up our Rochester Q-Jet to re-jet and I noticed in the center of the air horn gasket there is a piece of what looks like electrical tape/plastic material with the holes cut away so the rear metering rods and the hole for the threaded rod for the air cleaner to clear. I have two different carburetors one done by Dean Oliver and one was done by Hedworth and they both had this piece of tape or plastic in the center. Does anyone know what it is there for? __________________ Nelson Kowal Stock 345

09-03-2013, 09:59 AM	#2
Jim Cimarolli Senior Member Join Date: Mar 2002 Location: Sulphur Springs Texas Posts: 734 Likes: 118 Liked 151 Times in 42 Posts	Re: Carburetor Question Should be there to control fuel slosh on the leave.

09-03-2013, 03:02 PM	#3
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,303 Likes: 198 Liked 116 Times in 48 Posts	Re: Carburetor Question If have to fix another gasket get 3M super 33 electrical tape works well,another tip is check needle&seat while top is off hold pivot of float down w/finger and turn on fuel pump until float bowl is full and closes needle&seat and watch for about 1-2 minutes w'pump still running fuel level should stay the same,I have needle &seat leak every now and then and found this was my best way to check,they will leak but won't run over and out vent like holley,my car will only idle about 100-150 rpm slower and then bogs about 20-30 foot off starting line. when needle&seat are slightly leaking. Mike Taylor 3601

09-03-2013, 04:28 PM	#4
R. Thorne Member Join Date: May 2009 Posts: 172 Likes: 35 Liked 49 Times in 25 Posts	Re: Carburetor Question Also, depending on how tight the rods fit in the tape, a shot of your favorite penetrating oil every so often will keep the rods from possibly hanging open.