prime diesel pump 1937 d4

please,,,, I really need to get this d4 running ASAP.... need the procedure for bleeding the air and priming the fuel pump after having run it out of fuel …. help ,,, thanks Doug

Get pony running, start turning the diesel over, open bleeders on the back side of pump or loosen the nut holding the line to the injector until no air only fuel is coming out. repeat for the rest of the injectors, then open the throttle and it should run
Chuck C

not sure what that means... the pump is the unit with the four fuel lines coming out of the top, correct? are the bleeders on the back of that? next to the engine? on the units that the pipes screw on to there are flat head screws ,, are those the bleeders? thank you for responding quickly... can't believe I actually ran it out of fuel,, after four years... lol

I never mess with the bleeders. I just crack open the lines at the top the pump. Then at times I also crack the line right at the injector. When the fuel tower is completely dry I have used my shop vac on blow and stick it in the tank filler pipe. That slight pressure will push fuel all the way through the system.

Each of those four units is an individual pump for a cylinder. On the back is a bleeder screw which has a special tool but can be turned with a 1/4" wrench. They can be hard to get to on the later U-series but since yours is an earlier J-series, I think they're easier to get to.
The flat head screws are not bleeders.
As oldbeek wrote, you can instead loosen the individual injection lines although they're not intended for repeated "fiddling". I've bled my 5U just with the shop vac method which pushed fuel all the way through without bleeding anywhere

Hello ,,, and thank you for the information... I did try to blow the tank w/ an airtank and blow tip... I could not get the fuel to come to the top of the pump to the lines... it was pressured up to the fuel filter tower inlet pipe,, when we loosened the inlet or pipe at the bottom of the filter housing the diesel sprayed out more when we put the air to the tank... but it never got up to the top of the pump … even when we ran the pony and diesel together in it's starting sequence, although we did not put it in run, ie . take off the compression release.... so w/ air pressure and the engine turning over via the pony I could not get diesel to the top of the pump... took the small rectangular plate off the filter base but nothing to see there except the throttle linkage... also took off the front cover from the pump housing at the front by the fan which is attached by six bolts... inside you could see the throttle linkage and the governor and behind that the gears for I surmise running the pump... put my hand in and could feel the gears and then turned the fan over which made the engine move and the gears seemed to be moving ok w/o restricton… so now what??? lol I've got a clue w/ gas but this is a bit diff.. so any help is welcome... seems like somebody had a source for online shop manuals for these machines,, any thought there..... Thank You for your help... Doug ps I love this machine...

If this is a D315 engine in a 6 or 7U tractor then you have to open the lower bleed screw first on the filter housing with engine turning over, once you have fuel there close it and open the top bleed screw, once there is clear fuel there close it and then loosen the first fuel line on #1 pump on the injection pump housing [near the front] till clear fuel comes out, close it and repeat for the rest of the pumps.

not sure if it's a d315...but I don't know how to determine that.... the SN is 4G 4637 W. it's the same on both the engine and on the rear end... on of the members stated that it's right around the magic numbers that were when the r was left out.... anyway got a gas powered air compressor, going to pressurize the tank tomorrow and see if I can get fuel up to the top of the pump at the fuel pipes....

ps... I posted a bunch of pics a couple years ago for id purposes so if you check out my old posts u can see the cat from lots of angles

If that's an original 4G4637 it's an early D4400 engine that has the single vent filter tower and uses a washable element filter. (hopefully not clogged). You need to open the vents on the fuel injection pumps after venting the filter tower, run the starting engine at starting engine idle speed with the compression release in the start position. Throttle should be in the extreme forward position so the pumps are shut off. When no air bubbles show in the flow, close the vents. May take several cycles with the vent valves to get the air out. Make sure injection pump vent valve discharge holes are not plugged.

If you have a full tank of fuel open the vents and take a break while gravity flow works its way past the transfer pump and vents on its own or lightly pressurize the tank to speed up the process.