Swapping out the old T-handle and lid gaskets for new ones, and installing a new 30-micron Racor filter element, pretty much finished the project. While the lid was still off, I opened one of my two fuel valves slightly and let fuel pressure fill the canister almost to the top. Then I returned the valve to the off position temporarily and finished the job with a turkey baster. After securing the lid and opening both fuel valves all the way, I finally bled the secondary fuel filters on my Lehman SP135 diesel so there was no chance I’d air lock the old girl. Better safe than sorry, I always say.
Tough job? No, not really. Took me about two hours. The reliable old Lehman cranked up and ran like a top afterwards. And I suspect she’ll continue to run that way for many a year now.