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Old 11-21-2019, 10:47 AM   #15
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Posts: 28,967
Originally Posted by RamiDav View Post
When a diesel spins but doesn't start you can usually find a fuel problem .

IMHO the easiest place to start is fuel filters .

Have you done anything recently to the fuel system , filters etc ?

I would replace both fuel filters , do them one at a time .
Pull the filter , look for any evidence of black goo ( algae ) or any other
trash that shouldn't be in the fuel system , it may be right on top , easy to see.

In your case I suggest you get a gal of clean diesel to 1st fill the new filters .

As stated you should hear the lift pump run when you turn the key to on .
You may need to go to the back of the coach or at least open the door
to hear the pump running .
My pump is loud enough so I can hear it while in the drivers seat .
This is all with the key on before starting the engine .

Good luck hope you get it running soon .
Let us know the outcome .

In many, many years of working on them, I've never run into a diesel that didn't start, after shutting it down, due to fuel filters, unless they were jelled.

In this no start situation, opening up the fuel system, to change filters, has the potential to add another no start issue.
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Old 11-21-2019, 01:43 PM   #16
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Join Date: Apr 2017
Posts: 5

Both ECM fuses are good and there wss no power on either end of the fuse holders. The fuse block is located in the aft most compartment on the curb side, and has 3 large red wires approximately 6 gauge with 12 volts and an equal sized white wire that is ground on the left side; however, the ECM fuses are powered from 2 small red wires that come in via harness connectors on the right side. I made a jury rig bypass using an inline fuse holder and a switch to supply power to the ECM (image attached), and after cycling the key numerous times to top off and prime the 2 filters I replaced, she fired up.
Needed to get my wife to Florida for DR's appointments so drove it 726 miles over 2 days. Never missed a beat... now to try and track down where the ECM power originates to fix it right..
Trying to get schematics from REV now, the 2006 Endeavor schematics I have show ECM fuses are connected directly to the batteries.
Thanks for the support and suggestions, when I find the root cause and solution I will update this thread, if you have schematics for an o8 Diplomat or know a source please let me know.
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Old 11-22-2019, 07:09 PM   #17
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Location: FL
Posts: 9,675
In post 4 I attached a PDF. Is it of any use?

Endeavor is the sister to the Diplomat.

Here is the rear fuse panel with ECM fuses shown. Maybe this will help.
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File Type: pdf Fuse Rear Distribution Panel Harness.1.pdf (78.4 KB, 17 views)
Myron & Deborah
08 HR Endeavor 40 SKQ
400 Isl, 400 HP/// Now 450 HP
2016 Ford F150 Limited V6 with Ready Brake
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