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Yup, crapped up fuel system will get folks everytime. I hope you didnt pay a mechanic to solve it. We all end up with miscellaneous spare Unimog parts, I think its an ownership requirement ;)

It Time to look over some cartoons FLU 419 SEE and HMMH Extracts from PS Magazine Maintenance and Operating tips | SteelSoldiers BTW there is special very expensive custom tool for dealing with the plastic fuel hoses. I think most folks either use my previously described method or use...

Not the injection pump, the cam driven plunger pump in the foreground. I think I paid less than 100 bucks for a spare but never installed it during my starting woes. Of course, the boat tank test doesnt need it. https://expedition-imports.com/0000902750

Good Enough?

Sounds like the primary mechanical fuel pump may be bad. Its upstream of the primer pump. First time I have heard of the primary pumps going bad.

Back in high school I would occasionally have to get crap boxes running. With a gas engine the questions were, does it have fuel, ignition and would it turn over. We didnt have money to burn, so before going any further, we unscrewed a plug and laid it on the manifold and looked for a spark...

My guess is you have an air leak in the vacuum side of the fuel system. Its a known issue. What sometimes works is use the trick I learned on the internet about leaky plastic mercedes fuel lines which is cut a piece of fuel hose whose inner diameter is the outer diameter of the plastic fuel...