D2 Fuel Pressure?

The pressure on the gauge is an indicator of fuel pressure delivered to the Injector Plunger body through the filters by the low pressure delivery pump. Somewhere it is posted as 15 to 25psi (I think?). As far as having fuel under the rack cover, one of the guys that has a Parts book will have to tell you which seal is probably leaking.
drujinin

The first problem with fuel in the injector pump housing is that it should not accumulate in there. There is a drain line to drain it to the ground so check that first. There is a "normal" amount of leakage from the pumps and that may have accumulated over time with a clogged drain line.

Also possible that the seals on each end of the fuel gallery in the injection pump housing have simply lost their resiliency and no longer seal the joint between the housing and the fuel filter tower on the front end and the plug and the housing on the governor end. These are noted for putting lots of fuel in the oil pan though, so I would look at the drain line first unless you also have diluted oil.

I have found that when you get in the 5 - 7 psi range when cranking, things get a little iffy. Pressure is not required to "open the injectors", just need enough pressure to assure flow to the pumps.

I dunno about the pressure on a gauge but one of the first things to check on these is the pressure relief valve. If there's gunk in 'em or they're leaking due to a weak spring/worn valve they can be a bear to get going. .and once they do, you'll see a lack in power when you try to do anything. This was covered in another thread but I can't seem to find it at the moment. It may sound major but it's not. As far as fuel in the housing, ccjersey covered that.

Me, again. After replacing the Fuel Pressure gauge a couple weeks ago with a brand new Stewart Warner gauge that I had laying around, I have finally had a chance to get the pony going and check the pressure. My 5U D2 has ZERO fuel pressure. As it turns out, the original gauge does not work, but in this case it's accurate!😆 I have removed the fuel transfer pump from my 4U parts tractor and find that the relief valve is pretty nasty looking. The pump is currently soaking in carburetor cleaner overnight, tomorrow I will clean it up and see if I can use it. Is there anything I should know about replacing the pump?

Thanks again, Rich.

[quote="zootownjeepguy"]Me, again. After replacing the Fuel Pressure gauge a couple weeks ago with a brand new Stewart Warner gauge that I had laying around, I have finally had a chance to get the pony going and check the pressure. My 5U D2 has ZERO fuel pressure. As it turns out, the original gauge does not work, but in this case it's accurate!😆 I have removed the fuel transfer pump from my 4U parts tractor and find that the relief valve is pretty nasty looking. The pump is currently soaking in carburetor cleaner overnight, tomorrow I will clean it up and see if I can use it. Is there anything I should know about replacing the pump?

Thanks again, Rich.[/quote]

Hi Rich....I had some trouble with my D2 and it seems to be very similar to the problems you are having. The guys here were very helpful with the solution as it seemed to be my fuel transfer pump as well. If you do a search on my threads here you will find the whole process of overhauling the fuel transfer pump. It wasn't that difficult. If you have trouble finding parts and gaskets let me know as I bought spares.
Have a good evening.....Bill

I found the inside of the cover plate on my D2 5U transfer pump was rough so I surface ground about .003-.005 off and cleaned up all the crud inside. I also put in a new spring for the relief valve and got my pressure back.
good luck😆