One more problem I have run into with these (and other military ) trucks. The primary filters were originally a fram PCS1144. I forget the secondary number, but I seem to recall it was a Detroit filter. I have seen where people go to NAPA (including a certain museum I am familiar with) and they cross over to their filters. The gaskets are not always a good fit and with the variance between the two, you end up sucking air on the primary, or else leaking fuel off the secondary.
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