[70RAlll]

Originally Posted by njsteve

I was finagling with the original carb tonight and found this oddity in the fuel inlet. I have never seen a check valve in a filter cartridge before. The replacement Delco filter just has a paper gasket on the end. This rubber seal and check valve was pressed into the inlet of the original filter. It takes some serious pressure to unseat the valve. Was it an anti drainback valve?

Steve.. that filter with a check valve is a newer filter. I have a couple bought from AutoZone that have that check valve, original ones did nothave that, they just used a piece of paper.I always cut the nipple part of the check valve off and use the rubber seal piece in place of the paper seals that come with rebuild kits.. I believe someone put a new filter in at some point Steve..could be wrong about using those in 1973-doubt it though, but know for sure the new ones I buy have that valve..