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Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old 04-21-2009, 12:59 PM   #1
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Join Date: Apr 2002
Location: louisville, co
Posts: 372
Car: 86 T/A
Engine: 383
Transmission: ProBuilt 700R4 2800 Stall
Axle/Gears: 3.27 9 bolt

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Rubber Umbrella Check Valve
I'm new to carbs, but I have a holley 750 part# 4779 and was going threw it and was told by a friend to remove the rubber umbrella check valve from one of the fuel bowls. But after reading some posts I might need it in there. Trouble is I dont remember if it was supposed to go in the primary or secondary bowl... or both?? It only came in one of them but I dont remember which.
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Old 04-21-2009, 05:04 PM   #2
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Re: Rubber Umbrella Check Valve
I put one in both bowls hope thats right...
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Old 04-21-2009, 07:07 PM   #3
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Location: Littleton, CO USA
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Car: 82 Berlinetta(2)/57 Bel Air
Engine: LS1 (LS1)/LQ4
Transmission: 4L60E (T56)/4L80E
Axle/Gears: 10B 3.73(9" 4.11)/8.2" 4.11

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It's for the accelerator pump. If you have vacuum secondaries, you only need to put one in the primary bowl.

If mechanical secondaries, like the 4779, you need one in each fuel bowl.
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Old 04-21-2009, 10:34 PM   #4
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Join Date: Apr 2002
Location: louisville, co
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Car: 86 T/A
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Transmission: ProBuilt 700R4 2800 Stall
Axle/Gears: 3.27 9 bolt

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Re: Rubber Umbrella Check Valve
Thank you five7!

Hopefully i'll see ya up at bandimere this season.
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Old 04-22-2009, 01:57 PM   #5
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Join Date: Mar 2000
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Car: 82 Berlinetta(2)/57 Bel Air
Engine: LS1 (LS1)/LQ4
Transmission: 4L60E (T56)/4L80E
Axle/Gears: 10B 3.73(9" 4.11)/8.2" 4.11

Classifieds Rating: (11)
I'll be there tonight, as well as Friday, Saturday, and Sunday. Just running the '57, the LS1/T56 Berlinetta #2 isn't ready yet.
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Old 04-22-2009, 01:57 PM
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Reload this Page Rubber Umbrella Check Valve
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