Approx 50 mile drive

Did fine going up an incline

Coming down seemed to start losing power.

Pulled off the freeway at a weigh station and engine stalls.

Removed fuel cap,
No sound

Tank shows 1/3 remaining

Pumped the hand primer 40-50 times.

Starts up and gets me home the rest of the way (10 miles)

Inline filter shows clear, no detectable fuel leaks in engine bay.

This has been happening intermittently since I replaced my lift pump assembly.

Also swapped the old aluminum primer with the new style black plastic. Got if off my old lift pump so I know it's working.

Any ideas?

Thought it was algae, but wouldn't that show on the clear filter?

Maybe I'll fill up and swap the two fuel lines to see if there is an obstruction.

__________________
1983 300CD Turbodiesel