My Holley 4150 had a small leak out of the accelerator pump, so I decided to take it off yesterday and see if the screws were tight enough. Found that they were a little loose, so I tightened them figuring I had fixed the problem. While I had it off the car I decided to replace the bowl and metering block gaskets with those blue reusable kind and put new nylon reusable gaskets (the little white plastic ones) under the bowl attach screws.
Put it all back together and put it back on the car.
Now the bowl attach screws leak like hell no matter how much I tighten them. I even used a little socket wrench style screw driver to get them as tight as possible. What gives? Pretty sure the nylon gaskets aren't cracked and they are made by Holley to be reusable. I cannot drive this car because of the leaks. They drip until the bowl is empty.
I'm about to throw this old carb (yes, it has been rebuilt) in a box and buy a Quick Fuel.
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Gary.....did it originally have little cork gaskets on the bowl screws? Are the screws beveled, or flat where they sit against the bowl? Do the fancy new nylon washers/gaskets fit snug on the screws?(hole size too large, perhaps?)
I prefer using the cork, or paper style gaskets on the bowl screws.....the harder nylon stuff never seems to work right on the old stuff.
Are you sure the screws are not bottoming out now? The nylon washers/gaskets are thinner, iirc....
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
When I put it back together on Sunday, yes, they all seemed to seep. But before that, only one of them leaked. That's what puzzles me. Why did they work fine before but not now? Oh well, O'Rielly just called and said my gaskets are in, so that's the way I'm going.
Odd thing is, Holley sells a fuel bowl kit that includes a fuel bowl and all the gaskets for it. It uses the plastic ones!
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