[Wally Arntzen]

There must be a Cummins dealer sonewhere close to you in Florida that could look at it and give you an idea of the problem.
On my coach I only gave it one squirt to start and a canister would last me a couple of years. I used it a lot and put approximately 30,000 miles a year on it. The Cummins dealer was in Minnesota where you left and he informed me that using it as designed was no problem for that engine but he said to make sure that I did not keep pouring in either if it had a problem starting. I never had a problem starting.
It sounds like you may have something serious and I wish you well on what it may be.