I have been trying to track down a intermittent problem for months it should be a very simple tractor engine but I am just stumped
John Deere 4045TFM75 diesel on one of our tour boats
Here is what I have done so far.
1.New filter in the Racor water separator 20 micron and new secondary filters.
2.added 5 psi marine electric lift pump between the tank and Racor.
3 New mechanical lift fuel pump
4 New injection pump ,fuel temp sensor and 4 new injectors installed and timed by John Deere marine mechanic.
5.added mechanical fuel pressure gauge at exit of secondary fuel filter before it goes to injection pump
6 changed out return fuel line to the tank
7 rerouted fuel vent hose so there it had no low points to catch fuel and block vent
8 inspected and cleaned every plug and connection through out the wire harness
9. Changed out Murphy power view gauge
10 New Ecu installed by John Deere Mechanic
And I keep having the same problem
I will start the engine and fires up fine every perfect no hesitation at all
And it might run great for a few days
But it dies and I can not get it started
It throws code spn 1076 (Fuel Inj Pump Control Valve) FMI 5. (High Resistance)
And will not restart it might fired up for 2 or 3 seconds but is pretty much dead but maybe 30 mins to an hour later if will fire up and run great again.
The last time I thought I had it with new injection pump it ran good for two weeks but the just on the way back to the dock just before landing it died again
When it happens I feel a small stutter the 20 sec later it dies no matter what throttle position
At idle I have 6 psi fuel pressure and great flow under load it drops maybe to 3.5 psi John Deere says all it needs is 2 to 3 psi feed to run
I took the return line off and found that the hose had an adapter with a 1/8 hole
changed it out to a little bigger opening and seems to flow fine
No change in fuel pressure.
I also took the return off and put a 3/8 clear hose and just ran it back to the fuel fill to see if there where any air pockets that would show up but just some very very small bubbles hardly noticeable fuel temp coming out is 120 degrees
It feels like the ecu is shutting down the fuel pump and will not let it fire back up
Engine temp has never been over 183 degrees