Sounds like it could be the electric motor in the vacuum pump going bad. I have seen this happen before. That would explain why is stops after a minute or so. It shuts off when the vacuum is built up. Pump is located on the passenger side behind battery. Hope this helps. Good luck.

 

Checked at lunch today. Doesn't appear to be the vacuum pump.

The sound appears to be coming from underneath at the back of the engine. I will have to get under the truck on the weekend and see where its coming from.

The truck still drives fine, starts fine, power is fine....unknown

 

Thanks for the response, I appreciate it.

It does sound like a vacuum line off type of whine....I will check it out.

Thanks again...

 

Well, I thought I would report back to maintain this forums knowledge tank.

I was under the truck yesterday and listened to the whine...it seemed to be coming from the fuel pump...it was tought to actually pinpoint when the engine was running.

I was noticing when I turned the key to prime the pressure in the line to the injectors that the prime continued until it tripped out on O/L. So I put these two together and wondered if I got a bad batch of oil which plugged the filter and was causing a high dp across the filter. I always carry a spare fuel filter with me ...just in case.

Changed the fuel filters....and no more whine. Start up procedure and priming are back to normal.
Now I hop it didn't damage my injectors with the low line pressure from the loaded filter.

...Angus