I generally bleed sequentially all the way from the fuel filter housing to the injection valve.
Vents are the best. Loosening and tightening the lines can over time may damage ferrules on the lines. But later pumps did away with vents, so I could be wrong.
No, you are right. I caught hell finding a replacement D50 line that was buggered by a hammer mechanic. If you bleed from the line, use an easy touch.
This brings to mind my question about my D4 6U. Where can I buy the wrench for the vents? I know my dad had one for his RD4, but I cant find it. Thanks, Grant.
I bought one not to many years ago at my local Cat dealer. They had one in stock.
I have the version that goes on a 1/4" ratchet that I use with a 3" extension.
I've posted the part number before, if no one finds it in a SEARCH, I'll get it tonight.
Check the for sale section Harry Brandt has cat tools on ebay
$9+ dollars for the socket from Cat, 5P2682
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