Hi , I have a mid 70's Detroit 353 mounted to a large irrigation pump . 2 days ago while I was pumping water I was in the fields and noticed the sprinkler heads were losing water pressure and then return to normal pressure then to lose pressure again and return to normal .
I went to the pump and every 2 minutes or so I could hear it kinda lugging or working hard to maintain RPM's . After doing obvious checks ( inspected intake screen on water suction pipe , installed new fuel filters on the engine ( primary and secondary ) checked the air filter which was clean I ran it again and it still was laboring to run normal RPM's .
The engine does not seem to be smoking while this is happening .
Maybe ejectors need adjustment ?
It just does not Rev up like it use to , seems to labor somewhat when I turn the throttle up to set engine speed .
Hope I can get reply's soon as I need to water my crops .
Thanks for any assistance .