We are working on a D2 and wondering if someone can tell us if the injector return/ overflow line runs to the transfer pump or just exits to the bottom of the crank case??? ( ground )

I just got mine home.
And in the process of bleeding the system learned that they just run to the top of the oil pan. behind the filter housing..

Cheers
Have fun
Dudley

Chevymn the early d2s 3j 5j models return line did just spill to the ground,but the later ones after serial no 5j5634 returned the overflow to the bottom of the transfer pump.

Okay thanks davie, ours is a 3j101 would it matter if we routed it to the transfer pump unstead of just dumping on the ground????

I have been working on mine today. Some progress...

I have noticed that the vent line from the injectors is teed into the vent line fromt the transfer pump.
The top filter vent runs to the bottom by itself.

DUMB question??
If you tie your vent lines into the suction side of the transfer pump how will you bleed the air off???
Or is there a return to tank line??
Mine only has one line..

Dudley

All that line does from the top of the tall nozzles is return or bleed off any small amount of fuel that by-passes when parts in the nozzle (injector) get worn and has nothing to do with bleeding them as that is done when you open up the lines from each inj. pump to each injector nozzle in the head.Normally with new or good injector nozzles no fuel or just a few drops will seep out of them while running.

Okay, so does it matter if I ran the return line to the suction side of the pump??? I dont know how worn the injectors are....

Not a problem to run the return line to the suction side of the transfer pump.
This was commonly done and became a service item bulletin in about 1943 after some customers complained about the small amount of fuel dripping on the ground or getting blown back on the engine and creating a mess.

You can always disconnect the drain line if you want to do a leak check.

It has been known in some cases that internal leaks from combustion or compression getting past worn flat seat injectors has air bound the fuel system but it is a rare occasion.