Fuel Leak on 1HD-T 1993 LC HDJ80 (1 Viewer)

[xna0329]

View attachment 3948908
This is my injection pump (from a 4 cylinder). I have temporarily removed the ACSD and put a blanking plate on while I modify my ACSD.

I'm no professional, but in my experience (building or rebuilding a couple of pumps myself, but mostly seeing where other people's leak), these are the common leak points (in yellow). The yellow circle on the blanking plate represents the seal in the central shaft of the ACSD. The red line is where I would say yours is most likely leaking from.

Try spraying it down with brake cleaner, letting it dry off, then starting the engine and seeing where it starts to get wet.

Hi, I have called 10-15 shops locally and none of the shops would touch my rig... So I tried to take the pump off by myself. Can you please help me with some questions? Thanks in advance for any guidance!

• Timing Marks (Photo 1)
  I rotated the crankshaft to align the white paint mark at 12 o’clock. However, I noticed there’s also a TDC mark at about the 9 o’clock position. Should I be aligning to the TDC mark or sticking with the white paint mark?
• Pump Gear Removal (Photo 2)
  There are 5 nuts on the pump gear that I assume I need to remove. Will the gear want to rotate while I’m trying to loosen them? Is there a specific sequence I should follow? I understand I’ll need a puller to remove the gear—can anyone recommend a good puller that’s easy to use? Price isn’t my main concern; I’d rather have something that works smoothly.
• Pump Mounting Bolts (Photo 3)
  I’ve already removed the fuel lines (6 lines) and disconnected all the hoses. I’ve also loosened two nuts, one circled in red in the photo, and the other on the opposite side. Are there any additional bolts or nuts holding the pump in place that I need to remove before pulling it out?

 

[xna0329]

Eurasiaoverland is 100% correct. Clean it to ID correctly. But time is more than likely up and a total overhaul of pump is in future- soon.
In the mid 2000's when low sulfur was mandated in the US, my then 14 year old hdt pump started leaking like a stuck pig. I drove for another month w poorer fuel economy and a mess until I had time to service. If your pump has not been serviced in 20 years you are lucky.
The pump body that you point to has no leak points. That fuel line support bracket is NOT the culprit. On the rear of the pump is the raw steel distributive head (w age rust colored) where the lines attach via delivery valves. IF you have a leak there you are not fixing the leak on the truck. That could be the problem but with the steady running leak I am now leaning toward the rebuild (and throw that acsd away in ocean as described upthread)

Hi Rick, can you please recommend a decent puller to remove the injection pump. I prefer something easy to use, budget is not my concern. Thank you!

 

[Eurasiaoverland]

Download a factory service manual (FSM) from the documents section of this website.

 

[xna0329]

Download a factory service manual (FSM) from the documents section of this website.

Thanks! Just found another bolt by reading the FSM!

 

[xna0329]

Thanks! Just found another bolt by reading the FSM!

Whew... got her out... take off the ACSD and install the plate. Now, I will need to send it somewhere. Do you have any recommended shop I can have them to re-built this? Or can I buy a new one from somewhere. Thank you very much!

 

[duece71]

Whew... got her out... take off the ACSD and install the plate. Now, I will need to send it somewhere. Do you have any recommended shop I can have them to re-built this? Or can I buy a new one from somewhere. Thank you very much!

View attachment 3970366

New pump is going to be big $$$$. Try Diesel Fuel injection services in Portland OR, heard a lot of good things about them. Diesel Fuel Injection Services – Repair and Service in Scappoose, Oregon - https://dfispdx.com/