The problem with continued cranking with 'no start" is the cylinder walls get washed down with fuel which decreases compression further decreasing your chances of it lighting off.
A couple squirts of "half lub oil and half ATF" into each GP hole will often temporarily increase compression enough to get her fired up. Not more than a couple squirts tho

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

If it keeps sucking air at the primer pump, you'll have to do the same routine to get it started each time. The new style pump is less than $10 on line.