Posted by Kevin (FL) on October 17, 2007 at 09:08:01 from (65.0.133.82):
In Reply to: Re: 6.5 diesel posted by smdv806 on October 16, 2007 at 17:16:29:
The oil pressure sending unit serves two purposes. Besides sending a signal to the oil pressure gauge, it also provides voltage to the lift pump once oil pressure builds up. While cranking the engine, the lift pump gets it voltage (temporarily) from the starting circuit. Once the engine starts and oil pressure builds up, the contacts close inside the oil sending unit and then voltage is provided to the lift pump. These switches are "under-designed" and don't hold up very long. On our '95 Suburban, I've probably changed the switch at least 10 times. Used to be a dealer only item but now you can buy them at most auto parts stores. Cost about $25 or more.
The only test you need to do is while engine is running, place hand on lift pump and if its running, the oil switch is working. I'm about to install a green LED to provide a "pump running" indicator so I don't have to check it so often. The engine will run without the lift pump but not under heavy load. Also it helps if the tank is full or near full.
If you're getting pressure while cranking, then make sure you've bled all air out of the filter and only fuel is coming out the vent. You may have to crank awhile to get it running. You can also open up the air cleaner and spray some WD40 while cranking. Don't use ether on the 6.5!!!
If it doesn't crank, then I would expect a fuel stop solenoid failure or injection pump failure.
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