Rubber Umbrella Check Valve
Thread Starter
Joined: Apr 2002
Posts: 373
Likes: 0
From: louisville, co
Car: 86 T/A
Engine: 383
Transmission: 700R4
Axle/Gears: 3.27 9 bolt
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.
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
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.
If mechanical secondaries, like the 4779, you need one in each fuel bowl.
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
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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