Thought I should update this and let you know I didn't get off so easy.
I thought everything was fine after the Seafoam treatment.
Did not use it much but always did the monthly 2 hour exercise.
Had a hiccup in October and March but after another dose of Seafoam
it ran okay so I did not worry about it.
We were thinking of taking a short roadtrip at the end of April and even though it ran good at it's monthly exercise in early April I thought I should run it again to keep it "primed".
It would not run for more than 10-15 minutes before it started surging and then die. It was 80 degrees that day. I looked at my generator log and saw that the only times it had a problem was if the temp was over 60 degrees. All the times it ran good it was under 60.
So I figured I should finally get serious about it.
I found my old pressure gauge and a 1/4" tee and hooked it to the outlet side of the fuel filter. (Because of the short hose I could not get to the bottom clamp.)
When the gen would first start, it would read 2 pounds and then slowly drop to zero ! Not good for a fuel pump that should read between 2 1/2 to 4 pounds even thru the filter.
Called Cummins West who is only about 5 miles from me. $92 plus tax for the pump and $155 an hour figuring at least 3 hours.
Came in the house and ordered a pump on Amazon for $45 with free shipping and had it in 2 days.
Installed it the next day along with a new longer fuel line and new filter. Ran it for 3 hours. Put the pressure gauge on it. 4 pounds at start up down to 2-2 1/2 after getting hot.
Was able to lower it with a floor jack onto blocks (Thank You Liketoroam) without disconnecting anything but the fuel line but it still took me 5 hours. Even with it down and open, the pump is buried back in the corner and a PITA to get to.
So we took it for a trial run
Took 80 to Tahoe, 50 (the Loneliest Road)across Nevada, 15 down thru Utah to Barstow and 5 and 580 up to home.
With a few stops along the way.
Nice having that gen and AC when spending the night at Boron Rest Stop.
Thanks for the help and suggestions.
Hope I don't have to add an addendum to this, it is already too long.