As long as the engine is not running and the flap inside the K(E)-Jetronic is not moving there will be no fuel injected. So you can prime as often as you like to. It's just to build up pressure in the fuel system so it might start a bit easier.

7 year old fuel might be an issue. Ignition is not as good as with fresh fuel so you might just have a lot of fuel in your car that just couldn't be burned.

But a K-Jetronic not being used for seven years - especially when the car is about 30 years old now - also can cause a lot of troubles. The control plunger inside the fuel distributor might be stuck or worn and not being used for a long time the seals inside the fuel distributor also might be cracked now.

First of all I'd try to take care of all obvious things.

1. Use new fuel
2. Replace fuel filter
3. Replace old injectors (they suffer from wear, especially when being used for 100.000 km and more)

4. Check K-Jetronic pressures

5. If this all didn't help, check the electronic parts of the KE. I'm out now, I've just been working with K-Jetronic

6. Last option: fuel distributor rebuild