^^ That's a good idea. Now assume I see air in there, what would my recourse be?

I do see some air bubbles in my in-line filter. Is that normal or a tell-tale sign of something? When I put each new one in, I prime it a few times with the pump until it's full, but due to the angle at which is sits there's always a little air left.

Find the source and fix them of course. When idling reving the throttle, you should see a solid fuel stream there (in the clear line before the cigar hose), no occasional bubbles, or lot's of bubbles or foamy fuel.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

The fuel jumper lines are the 3.2 ones.

Normal for an air bubble in the inline (primary) filter when not running.

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83 SD

84 CD

For anyone interested in an update:

I've been driving this car daily since I sorted out the fuel system. It's been such a joy to drive. Unfortunately, circumstances have just in the last two weeks caused me to consider selling it. I don't want to, so I listed it at a price that I'd be a fool to turn down. I'll be buying an SL500 in the next week or so also, but only to flip. If the diesel sells in that time, that means I won't have to dig too far into my pockets. If it doesn't sell, OH WELL! I'll just keep enjoying her.

If anyone is interested, I can send the craigslist link. I don't know if it's kosher to post it in this thread.