detroit cracks and cranks?

Sounds like injectors are leaking down. May need new ones. The extra long cranking comes from the loss of fuel between the supply pump and the injectors. Same scenerio as when you have to fill a fuel filter after changing it. It takes some cranking before fuel reaches the injectors again.

 

look for power to the wire on the injector.

 

Ck the work order to see if it was replaced?

 

Do you have a Davco Fuel Processor?

 

I had a similar problem except I don't know how long forever cranking is in time, but longer than normal, I assume

If the Davco check valve is dirty and clogged it will cause a hard starting issue..

I replaced my check valve too, but it was still having the same problem.

I have a Davco with a heating element, i dont know if yours is heated or not. If you look underneath on the older Davco units, they have a nut like plug (hexagon) threaded into the base. If you unscew that plug with a socket, there is a O-ring attached to it.

That O-ring over time gets dried out and starts leaking fuel or letting air in. That will need to be replaced.

I had to contact Davco for the part # as it is not listed in their parts catalogue or as a Davco Serviceable part.

You will need the part number from them and you will need to go to a place that sells O-rings and give them the part #. They will sell you the exact part you need.

It was a 50 cent part and it fixed my hard starting problem.