I ran just the glas bowl pump filter on my 235 and had no problems.
I did however have problems with no filter at all, occasionally a piece of trash in the float valve. Swapping the pump for one with a filter solved the problem.

One good one is all you need.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-