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3 common things can cause fuel in the oil.
Hydraulic head o-rings bad.
Boost fuel pump seals bad.
Fuel density compensator is leaking.
Is your FDC bypassed? The military did this later on, to eliminate this issue.
I feel we'd be remiss if we did not mention in this thread that the correct relay has an isolated ground.
Not all relays are this way and they do look alike.
Test whatever you get before installing it. Use an ohm meter or continuity tester and be sure there is no continuity(connection) between...
I've been asking for a submarine forum for some time now.
Perhaps boats could be a sub-forum of the sub forum....
Please attach pictures, not link them. Use the paperclip icon with tapatalk.
Replace all of the rubber fuel hoses. There are a bunch on the fuel tank selector valve.
Try searching "selector valve o-rings".
Here's one to get started, https://www.steelsoldiers.com/showthread.php?76086-5-ton-fuel-tank-selector-valve-cleaning-rebuild
And here one on the fuel lines...
You can start by opening all the bleeders.
You will need to push new fluid through to get the system clean.
The system will not drain completely just by gravity.
A pressure bleeder is the best way to do it.
Please let me know if your done with this thread, and I will close it.
No sence wasting everyone's time, if you're going to get your info/help elsewhere and not share/post it here.
Don't be afraid to ask, anything.
We all enjoy helping(in our own different ways).
If you need to learn(and share), this is the place for it!.
We're glad your here( I'm sure I speak for all).
Our site has some of the best people in the world here!
You can download the manulas for your truck for free right here on our site.
You should take the time to read the basic operators manual(at least).
It will explain things like this open hole, and most other basic questions.
https://www.steelsoldiers.com/upload/M35/TM9-2320-386-10.pdf
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